Electrician Question Paper MCQ Book PDF Free Download
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Feb 22, 2025
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About This Presentation
Electrician Question Paper MCQ Book PDF Free Download. All these Questions collected from old question papers and NIMI Question Bank. Helpful for ITI Trade Theory CBT Exam, Apprentice test, CTS AITT, ISRO, DRDO, NAVY, ARMY, Naval Dockyard, Tradesman, Training Officer, Instructor, RRB ALP CBT, Railwa...
Slide Content
Contents
ITI Question Bank (1
st
Year) ............................................................................................................................................... 2
ITI Question Bank (2
nd
Year) ............................................................................................................................................ 29
RRB ALP CBT 2 Electrician Technician Most Repeated Question .................................................................................... 53
RRB ALP Technician (Electrician) 23-01-2019 Shift -1 ..................................................................................................... 56
RRB ALP (Assistant Loco Pilot) Technician (Electrician) 23-01-2019 shift-II ................................................................... 59
ITI Question Bank (1
st Year)
1. What is the name of this safety symbol?
a) warning sign
b) essential signs
c) prohibition sign
d) Informative signs
Answer- d
2. Which of the following is a physical loss?
a) Smoking
b) Vibration
c) corrosion
d) Radioactivity
Answer- b
3. Which of the following is the correct order of using fire extinguishers?
a) drag, aim, press, rotate b) drag, aim, rotate, press
c) push, arrange, press, rotate d) push, arrange, rotate, sequence
Answer- a
Which of the following steps in 5S concept indicates “Standardization”
a) First stage b) Second stage c) Third stage d) Fourth stage
Answer- d
5. Which pliers are used to make hooks and loops of wire?
a) Flat nose pliers b) Long nose pliers
c) Round nose pliers d) Diagonal cutting pliers
Answer- c
ITI Question Bank (1
st
Year) ............................................................................................................................................... 2
ITI Question Bank (2
nd
Year) ............................................................................................................................................ 29
RRB ALP CBT 2 Electrician Technician Most Repeated Question .................................................................................... 53
RRB ALP Technician (Electrician) 23-01-2019 Shift -1 ..................................................................................................... 56
RRB ALP (Assistant Loco Pilot) Technician (Electrician) 23-01-2019 shift-II ................................................................... 59
ITI Question Bank (1
st Year)
1. What is the name of this safety symbol?
a) warning sign
b) essential signs
c) prohibition sign
d) Informative signs
Answer- d
2. Which of the following is a physical loss?
a) Smoking
b) Vibration
c) corrosion
d) Radioactivity
Answer- b
3. Which of the following is the correct order of using fire extinguishers?
a) drag, aim, press, rotate b) drag, aim, rotate, press
c) push, arrange, press, rotate d) push, arrange, rotate, sequence
Answer- a
Which of the following steps in 5S concept indicates “Standardization”
a) First stage b) Second stage c) Third stage d) Fourth stage
Answer- d
5. Which pliers are used to make hooks and loops of wire?
a) Flat nose pliers b) Long nose pliers
c) Round nose pliers d) Diagonal cutting pliers
Answer- c
6. What is the colour of the back side of the warning symbol in the original category?
a) blue b) white c) yellow d) green
Answer- c
7. Which fire extinguisher is used for fire in electrical equipment?
a) Halon
b) Foam
c) gas
d) Water
Answer- a
8. Which personal protective equipment is used for protection from smoke?
a) Apron
b) Glasses
c) ear plugs
d) Nasal mask
Answer- d
9. Which method is used to lift and move heavy loads?
a) Winch
b) Cranes and slings
c) layers and rollers
d) Machine operated platform
Answer- b
10. What is smothering in fire extinguishing?
a) Adding fuel to the fire
b) Removing fuel from the fire
c) Lowering the temperature by using water
d) isolate the fire from the oxygen supply
Answer- d
11. What is starving in extinguishing a fire?
a) Adding fuel to the fire
b) separating fuel from the fire
c) Lowering the temperature by using water
d) isolate the fire from the oxygen supply
Answer- c
a) blue b) white c) yellow d) green
Answer- c
7. Which fire extinguisher is used for fire in electrical equipment?
a) Halon
b) Foam
c) gas
d) Water
Answer- a
8. Which personal protective equipment is used for protection from smoke?
a) Apron
b) Glasses
c) ear plugs
d) Nasal mask
Answer- d
9. Which method is used to lift and move heavy loads?
a) Winch
b) Cranes and slings
c) layers and rollers
d) Machine operated platform
Answer- b
10. What is smothering in fire extinguishing?
a) Adding fuel to the fire
b) Removing fuel from the fire
c) Lowering the temperature by using water
d) isolate the fire from the oxygen supply
Answer- d
11. What is starving in extinguishing a fire?
a) Adding fuel to the fire
b) separating fuel from the fire
c) Lowering the temperature by using water
d) isolate the fire from the oxygen supply
Answer- c
12. What is the waste disposal method that saves a lot of energy?
a) Land filling
b) Recycling
c) Bhasmikaran
d) Fertilizing
Answer- b
13. Which type of artificial respiration method is used for a victim who has chest and abdominal
injuries?
a) Schaefer method
b) Mouth to mouth method
c) Mouth to nose method
d) Nelson's arm up back pressure method
Answer- d
14. What is the use of pincers?
a) Twisting the flexible wire
b) Cutting small diameter wire
c) Removing pins and nails from wood
d) Holding small objects where fingers cannot reach
Answer- c
15. How will you identify a person suffering from a heart attack?
a) Pain in the spine
b) The mouth will be completely closed
c) Sudden swelling in the abdomen
d) Blue colour around the lips
Answer- d
16. What is the name of this tool?
a) Wire stripper
b) Crimping tool
c) Combination pliers
d) Diagonal cutting pliers
Answer- d
a) Land filling
b) Recycling
c) Bhasmikaran
d) Fertilizing
Answer- b
13. Which type of artificial respiration method is used for a victim who has chest and abdominal
injuries?
a) Schaefer method
b) Mouth to mouth method
c) Mouth to nose method
d) Nelson's arm up back pressure method
Answer- d
14. What is the use of pincers?
a) Twisting the flexible wire
b) Cutting small diameter wire
c) Removing pins and nails from wood
d) Holding small objects where fingers cannot reach
Answer- c
15. How will you identify a person suffering from a heart attack?
a) Pain in the spine
b) The mouth will be completely closed
c) Sudden swelling in the abdomen
d) Blue colour around the lips
Answer- d
16. What is the name of this tool?
a) Wire stripper
b) Crimping tool
c) Combination pliers
d) Diagonal cutting pliers
Answer- d
17. What immediate steps should be taken to save the victim if he is still in contact with the electric
power source?
a) pull or push with hands
b) Report electric shock to your authority
c) Call someone to rescue the person
d) Switch off the power supply
Answer- d
18. What is the name of this warning sign?
a) School b) Guarded c) Unguarded d) Pedestrian crossing
Answer- d
19. If the victim has a head injury and is dying, what is the golden hour for him?
a) first 15 minutes b) first 30 minutes
c) first 45 minutes d) first 60 minutes
Answer- b
20. Which condition of the victim is called coma?
a) Being unconscious but responding when called
b) Being conscious but not responding when called
c) Respond to calls for breathing
d) Lying completely insensitive and not responding when called
Answer- d
21. What is the use of this gauge?
a) Checking the inside radius of the job
b) Checking the diameter of a cylindrical job
c) Checking the height and parallelism of the job
d) placing the job parallel to the datum in the machines
Answer- a
power source?
a) pull or push with hands
b) Report electric shock to your authority
c) Call someone to rescue the person
d) Switch off the power supply
Answer- d
18. What is the name of this warning sign?
a) School b) Guarded c) Unguarded d) Pedestrian crossing
Answer- d
19. If the victim has a head injury and is dying, what is the golden hour for him?
a) first 15 minutes b) first 30 minutes
c) first 45 minutes d) first 60 minutes
Answer- b
20. Which condition of the victim is called coma?
a) Being unconscious but responding when called
b) Being conscious but not responding when called
c) Respond to calls for breathing
d) Lying completely insensitive and not responding when called
Answer- d
21. What is the use of this gauge?
a) Checking the inside radius of the job
b) Checking the diameter of a cylindrical job
c) Checking the height and parallelism of the job
d) placing the job parallel to the datum in the machines
Answer- a
22. What is the name of this sand?
a) Rasp cut sand b) Single cut sand c) Double cut sand d) Curved cut sand
Answer- a
23. What causes twisting defect in wood?
a) Faulty storage
b) uneven shrinkage
c) Wrong seasoning
d) Irregularity in growth of branches
Answer- b
24. What is the use of mortise chisel?
a) Doing normal chiselling in wood
b) Drilling rectangular holes in wood
c) Wood scrapping and finishing
d) Light chiselling of wood and cleaning of sharp edges
Answer- b
25. What type of stakes are used for sharp bends in sheet metal?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- b
26. Which type of cold chisel is used to square the edges of materials?
a) Web chisel b) Cross cut chisel c) Half round chisel d) Diamond cut chisel
Answer- d
27. Which type of caliper is used to draw parallel lines on the outer edges of a material?
a) Internal caliper b) Jenny caliper
c) External caliper d) Spring joint caliper
Answer- b
a) Rasp cut sand b) Single cut sand c) Double cut sand d) Curved cut sand
Answer- a
23. What causes twisting defect in wood?
a) Faulty storage
b) uneven shrinkage
c) Wrong seasoning
d) Irregularity in growth of branches
Answer- b
24. What is the use of mortise chisel?
a) Doing normal chiselling in wood
b) Drilling rectangular holes in wood
c) Wood scrapping and finishing
d) Light chiselling of wood and cleaning of sharp edges
Answer- b
25. What type of stakes are used for sharp bends in sheet metal?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- b
26. Which type of cold chisel is used to square the edges of materials?
a) Web chisel b) Cross cut chisel c) Half round chisel d) Diamond cut chisel
Answer- d
27. Which type of caliper is used to draw parallel lines on the outer edges of a material?
a) Internal caliper b) Jenny caliper
c) External caliper d) Spring joint caliper
Answer- b
28. What is the name of this drill bit?
a) Flat drill bit b) Taper shank bit c) Countersink bit d) Straight shank bit
Answer- b
29. Which type of stake is used for general use in sheet metal?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- a
30. What does the number 1.25 indicate in ISO metric fine thread M12 x 1.25 ?
a) diameter of the thread
b) pitch of the thread
c) depth of thread
d) length of the thread
Answer- b
31. Which file is used to sharpen the blunt teeth of a tenon saw?
a) square sand
b) Circular file
c) triangular sand
d) Semi circular file
Answer- c
32. Name the part of the sand indicated by “x”?
a) edge b) hill
c) Tang d) Shoulder
Answer- b
a) Flat drill bit b) Taper shank bit c) Countersink bit d) Straight shank bit
Answer- b
29. Which type of stake is used for general use in sheet metal?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- a
30. What does the number 1.25 indicate in ISO metric fine thread M12 x 1.25 ?
a) diameter of the thread
b) pitch of the thread
c) depth of thread
d) length of the thread
Answer- b
31. Which file is used to sharpen the blunt teeth of a tenon saw?
a) square sand
b) Circular file
c) triangular sand
d) Semi circular file
Answer- c
32. Name the part of the sand indicated by “x”?
a) edge b) hill
c) Tang d) Shoulder
Answer- b
33. What is the name of this tool?
a) Jenny Caliper
b) Internal caliper
c) External caliper
d) Firm joint caliper
Answer- a
34. What is the name of the angle represented by “x” in chisel?
a) rake angle
b) Point angle
c) clearance angle
d) inclination angle
Answer- b
35. What is the use of Fermor chisel?
a) In chipping and finishing of joints
b) General chiselling work
c) making rectangular holes in wood
d) Light chiselling of wood and cleaning of sharp edges
Answer- b
36. What is the purpose of hem folding in sheet metal work?
a) Helps in making square boxes
b) Helps in bending sheet metal easily
c) Prevents the formation of rough edges after cutting
d) Protects the sheet from damage
Answer- d
a) Jenny Caliper
b) Internal caliper
c) External caliper
d) Firm joint caliper
Answer- a
34. What is the name of the angle represented by “x” in chisel?
a) rake angle
b) Point angle
c) clearance angle
d) inclination angle
Answer- b
35. What is the use of Fermor chisel?
a) In chipping and finishing of joints
b) General chiselling work
c) making rectangular holes in wood
d) Light chiselling of wood and cleaning of sharp edges
Answer- b
36. What is the purpose of hem folding in sheet metal work?
a) Helps in making square boxes
b) Helps in bending sheet metal easily
c) Prevents the formation of rough edges after cutting
d) Protects the sheet from damage
Answer- d
37. Which type of notch is used to fold the ends of a sheet?
a) V notch
b) oblique notch
c) square notch
d) straight notch
Answer- d
38. What is the purpose of cross cut cold chisel?
a) For cutting kivage
b) Cutting curved drains
c) square the material at the corners
d) Removing metal from large surface
Answer- a
39. What type of notch is used for 90
° turning?
a) V notch
b) oblique notch
c) square notch
d) straight notch
Answer- a
40. Which type of curve cutting hand saw is used for internal cutting of wood?
a) Compass saw
b) key hole saw
c) Coping saw
d) Fret saw
Answer- b
41. What is the name of the stake used for sheet metal work?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- c
a) V notch
b) oblique notch
c) square notch
d) straight notch
Answer- d
38. What is the purpose of cross cut cold chisel?
a) For cutting kivage
b) Cutting curved drains
c) square the material at the corners
d) Removing metal from large surface
Answer- a
39. What type of notch is used for 90
° turning?
a) V notch
b) oblique notch
c) square notch
d) straight notch
Answer- a
40. Which type of curve cutting hand saw is used for internal cutting of wood?
a) Compass saw
b) key hole saw
c) Coping saw
d) Fret saw
Answer- b
41. What is the name of the stake used for sheet metal work?
a) Square steak
b) Hatchet Stake
c) Blow Horn Steak
d) Bevel edge square steak
Answer- c
42. What is the name of the tool?
a) Claw hammer b) Tack hammer c) Cross pin hammer d) Straight pin hammer
Answer- b
43. Which type of chisel is used to separate metals after chain drilling?
a) Flat chisel b) Web chisel
c) Cross cut chisel d) Diamond point chisel
Answer- b
44. Which type of soldering flux is used for galvanized iron?
a) Resins
b) Zinc Chloride
c) Sal ammoniac
d) Hydrochloric acid
Answer- d
45. Name the part indicated by x in this underground cable?
a) Bedding
b) Armoring
c) Lead sheet
d) paper insulation
Answer- a
46. What is the full form of XLPE?
a) Cross Line Poly Ethylene
b) X'ess Line Phase Earthing
c) Cross Linked Poly Ethylene
d) Excess Length Paper and Ebonite
Ans. c
a) Claw hammer b) Tack hammer c) Cross pin hammer d) Straight pin hammer
Answer- b
43. Which type of chisel is used to separate metals after chain drilling?
a) Flat chisel b) Web chisel
c) Cross cut chisel d) Diamond point chisel
Answer- b
44. Which type of soldering flux is used for galvanized iron?
a) Resins
b) Zinc Chloride
c) Sal ammoniac
d) Hydrochloric acid
Answer- d
45. Name the part indicated by x in this underground cable?
a) Bedding
b) Armoring
c) Lead sheet
d) paper insulation
Answer- a
46. What is the full form of XLPE?
a) Cross Line Poly Ethylene
b) X'ess Line Phase Earthing
c) Cross Linked Poly Ethylene
d) Excess Length Paper and Ebonite
Ans. c
47. What is the use of serving layer in underground cable?
a) protects the cable from moisture
b) protects the cable from mechanical damage
c) protects the metallic shell from corrosion
d) Protects the armouring from atmospheric conditions
Answer- d
48. What type of cabling method is used in production plants?
a) in the duct
b) Rack in the air
c) with the building
d) directly into the ground
Answer- b
49. How many electrons are there in the bond cycle of a copper atom?
a) 1
b) 2
b) 8
c) 18
Answer: a
50. What is the effect of electric current in neon lamp called?
a) thermal effect
b) Magnetic effect
c) Chemical effect
d) gas ionization effect
Answer- d
51. The unit of insulator resistance is –
a) Ohm
b) Kilo ohm
c) milli ohm
d) mega ohm
Answer- d
52. What type of joints are used to increase the length of conductor in overhead line?
a) scarfed joint b) aerial tap joint
c) Britannia Tea Addition d) Western Union Addition
Answer- d
a) protects the cable from moisture
b) protects the cable from mechanical damage
c) protects the metallic shell from corrosion
d) Protects the armouring from atmospheric conditions
Answer- d
48. What type of cabling method is used in production plants?
a) in the duct
b) Rack in the air
c) with the building
d) directly into the ground
Answer- b
49. How many electrons are there in the bond cycle of a copper atom?
a) 1
b) 2
b) 8
c) 18
Answer: a
50. What is the effect of electric current in neon lamp called?
a) thermal effect
b) Magnetic effect
c) Chemical effect
d) gas ionization effect
Answer- d
51. The unit of insulator resistance is –
a) Ohm
b) Kilo ohm
c) milli ohm
d) mega ohm
Answer- d
52. What type of joints are used to increase the length of conductor in overhead line?
a) scarfed joint b) aerial tap joint
c) Britannia Tea Addition d) Western Union Addition
Answer- d
53. What type of soldering flux is used for soldering aluminium conductors?
a) tallow
b) Ker-al-Light
c) Zinc Chloride
d) Sal Ammonia Rosin
Answer- b
54. What effect does repeated melting of molten solder have?
a) the proportion of tin decreases
b) portion of lead decreases
c) prevents slugs from forming
d) uneven flow across joints
Answer- a
55. What will happen to the PVC insulator of a cable if excessive current continues to flow for a
long time?
a) the voltage will increase
b) voltage will decrease
c) insulator resistance will increase
d) insulator resistance will decrease
Answer- d
56. Which method of cable laying is suitable for narrow areas?
a) Rack in the air
b) Duct pipe
c) with buildings
d) directly into the ground
Answer- b
57. Name the part indicated by x in this underground cable?
a) Serving
b) Bending
c) Armoring
d) Lead sheath
Answer- d
a) tallow
b) Ker-al-Light
c) Zinc Chloride
d) Sal Ammonia Rosin
Answer- b
54. What effect does repeated melting of molten solder have?
a) the proportion of tin decreases
b) portion of lead decreases
c) prevents slugs from forming
d) uneven flow across joints
Answer- a
55. What will happen to the PVC insulator of a cable if excessive current continues to flow for a
long time?
a) the voltage will increase
b) voltage will decrease
c) insulator resistance will increase
d) insulator resistance will decrease
Answer- d
56. Which method of cable laying is suitable for narrow areas?
a) Rack in the air
b) Duct pipe
c) with buildings
d) directly into the ground
Answer- b
57. Name the part indicated by x in this underground cable?
a) Serving
b) Bending
c) Armoring
d) Lead sheath
Answer- d
58. Which part in underground cable protects the metallic shield from corrosion?
a) Serving b) Bedding c) Armouring d) Lead sheath
Answer - b
59. Why should a soldering iron be kept on a stand when not in use?
a) It prevents burning and fire b) To control excess heat
c) To save time in soldering process d) To protect the operator from electric shock
Answer- a
60. What type of wire connections are found in a junction box?
a) Aerial tap joint
b) straight tap joint
c) Rat tail joint
d) meridian joint
Answer- c
61. What is the name of this joint?
a) Married couple
b) scarfed joint
c) Western Union Addition
d) Britannia Tea Joint
Answer- a
62. Which type of soldering method is used for servicing and repair work?
a) deep soldering
b) soldering with flame
c) Soldering with a soldering gun
d) Soldering with a soldering iron
Answer- c
63. What is the use of deep soldering method?
a) soft soldering
b) Piping and cable soldering work
c) Soldering of small parts to PCB
d) Soldering of sensitive electrical parts
Answer- c
a) Serving b) Bedding c) Armouring d) Lead sheath
Answer - b
59. Why should a soldering iron be kept on a stand when not in use?
a) It prevents burning and fire b) To control excess heat
c) To save time in soldering process d) To protect the operator from electric shock
Answer- a
60. What type of wire connections are found in a junction box?
a) Aerial tap joint
b) straight tap joint
c) Rat tail joint
d) meridian joint
Answer- c
61. What is the name of this joint?
a) Married couple
b) scarfed joint
c) Western Union Addition
d) Britannia Tea Joint
Answer- a
62. Which type of soldering method is used for servicing and repair work?
a) deep soldering
b) soldering with flame
c) Soldering with a soldering gun
d) Soldering with a soldering iron
Answer- c
63. What is the use of deep soldering method?
a) soft soldering
b) Piping and cable soldering work
c) Soldering of small parts to PCB
d) Soldering of sensitive electrical parts
Answer- c
64. Name the part indicated by x in belted underground cable?
a) Jute Filing
b) Armoring
c) Lead sheath
d) Paper is a bad conductor
Answer- c
65. Which insulating material is inserted into underground cables as a hot compound?
a) Poly amine hardener
b) Cast resin compound
c) Bituminous compounds
d) Epoxy cast resin compound
Answer- c
66. What types of faults can be detected in underground cables?
a) Loop test
b) External growler test
c) Break down voltage test
d) Insulator resistance test
Answer- a
67. What is the value of conductivity of aluminium conductor?
a) 61 mho/m
56 mho/m b.
c) 35 mho/m
d) 28 mho/m
Ans. c
68. In underground cable the size of neutral conductor as compared to phase conductor is
a) same as phase conductor b) half of the phase conductor
c) One fourth of the phase conductor d) One third of the phase conductor
Answer- b
a) Jute Filing
b) Armoring
c) Lead sheath
d) Paper is a bad conductor
Answer- c
65. Which insulating material is inserted into underground cables as a hot compound?
a) Poly amine hardener
b) Cast resin compound
c) Bituminous compounds
d) Epoxy cast resin compound
Answer- c
66. What types of faults can be detected in underground cables?
a) Loop test
b) External growler test
c) Break down voltage test
d) Insulator resistance test
Answer- a
67. What is the value of conductivity of aluminium conductor?
a) 61 mho/m
56 mho/m b.
c) 35 mho/m
d) 28 mho/m
Ans. c
68. In underground cable the size of neutral conductor as compared to phase conductor is
a) same as phase conductor b) half of the phase conductor
c) One fourth of the phase conductor d) One third of the phase conductor
Answer- b
69. What is the reading of micrometer?
a) 5.05mm
b) 5.00mm
c) 4.55mm
d) 4.05mm
Ans. c
70. Which method of soldering is used for repairing the body of vehicles?
a) deep soldering
b) soldering with flame
c) Soldering with a soldering iron
d) Soldering with a soldering gun
Answer- b
71. What is the advantage of twisted conductor over solid conductor?
a) Low price
b) more flexible
c) low voltage drop
d) greater insulator resistance
Answer- b
72. What is the current capacity of a 16A cable if it is protected by overcurrent protection?
a) 11A
b) 13A
c) 15A
d) 18A
Ans.b
73. What is the disadvantage of solid conductor compared to twisted conductor?
a) low hardness
b) Low flexibility
c) low melting point
d) low mechanical strength
Answer- b
a) 5.05mm
b) 5.00mm
c) 4.55mm
d) 4.05mm
Ans. c
70. Which method of soldering is used for repairing the body of vehicles?
a) deep soldering
b) soldering with flame
c) Soldering with a soldering iron
d) Soldering with a soldering gun
Answer- b
71. What is the advantage of twisted conductor over solid conductor?
a) Low price
b) more flexible
c) low voltage drop
d) greater insulator resistance
Answer- b
72. What is the current capacity of a 16A cable if it is protected by overcurrent protection?
a) 11A
b) 13A
c) 15A
d) 18A
Ans.b
73. What is the disadvantage of solid conductor compared to twisted conductor?
a) low hardness
b) Low flexibility
c) low melting point
d) low mechanical strength
Answer- b
74. What is the cause of cold solder defect in soldering?
a) excessive heating
b) Inadequate heating
c) Wrong use of solder
d) high watt soldering iron
Answer- b
75. What happens if a voltmeter is connected as an ammeter?
a) Low reading
b) No deviation
c) The meter will burn out
d) Precession deviation
Answer- a
76. What is an example of excess current protection?
a) MCB
b) MCCCB
c) HRC fuse
d) Rewireable fuse unit
Answer- d
77. Which conductor is used for extension lines?
a) insulated conductor
b) insulated solid conductor
c) bare conductor
d) two core cable
Answer- c
78. How many electrons are there in the third shell of copper atom?
a) 8
b) 13
c) 18
d) 29
Ans. c
79. Which is a semiconductor material?
a) Ureka b) Ebonite
c) Manganin d) Germanium
Answer- d
a) excessive heating
b) Inadequate heating
c) Wrong use of solder
d) high watt soldering iron
Answer- b
75. What happens if a voltmeter is connected as an ammeter?
a) Low reading
b) No deviation
c) The meter will burn out
d) Precession deviation
Answer- a
76. What is an example of excess current protection?
a) MCB
b) MCCCB
c) HRC fuse
d) Rewireable fuse unit
Answer- d
77. Which conductor is used for extension lines?
a) insulated conductor
b) insulated solid conductor
c) bare conductor
d) two core cable
Answer- c
78. How many electrons are there in the third shell of copper atom?
a) 8
b) 13
c) 18
d) 29
Ans. c
79. Which is a semiconductor material?
a) Ureka b) Ebonite
c) Manganin d) Germanium
Answer- d
80. Calculate the electrical energy consumption in units when a 500W lamp is lit for 5 hours
a) 0.5 units
b) 1.0 unit
c) 1.5 units
d) 2.5 units
Ans.d
81. Which law states that the voltage applied to a closed electric circuit is equal to the sum of the
voltage drops?
a) Ohm's law
b) Law of resistance
c) Kirchhoff's first law
d) Kirchhoff's second law
Answer- d
Two lamps of 200W/240V are connected in series across a 240V supply; find the total power
a) 50W
b) 100W
c) 200W
d) 400W
Ans.b
83. What will change in the resistance of a conductor if its diameter is doubled?
a) it will increase by double
b) will decrease by four times
c) will decrease by half
d) there will be no change in resistance
Answer- b
84. Which substance has the property of negative temperature coefficient?
a) Mica
b) Eureka
c) Copper
d) Manganin
Answer- a
85. What are the electrical quantities related to Ohm's law?
a) Current, resistance and power b) Current, voltage and resistance
c) Current, voltage and resistance d) Voltage, resistance and current efficiency
Answer- b
a) 0.5 units
b) 1.0 unit
c) 1.5 units
d) 2.5 units
Ans.d
81. Which law states that the voltage applied to a closed electric circuit is equal to the sum of the
voltage drops?
a) Ohm's law
b) Law of resistance
c) Kirchhoff's first law
d) Kirchhoff's second law
Answer- d
Two lamps of 200W/240V are connected in series across a 240V supply; find the total power
a) 50W
b) 100W
c) 200W
d) 400W
Ans.b
83. What will change in the resistance of a conductor if its diameter is doubled?
a) it will increase by double
b) will decrease by four times
c) will decrease by half
d) there will be no change in resistance
Answer- b
84. Which substance has the property of negative temperature coefficient?
a) Mica
b) Eureka
c) Copper
d) Manganin
Answer- a
85. What are the electrical quantities related to Ohm's law?
a) Current, resistance and power b) Current, voltage and resistance
c) Current, voltage and resistance d) Voltage, resistance and current efficiency
Answer- b
86. What will be the effect in a parallel circuit if one branch is open?
a) the current will remain the same
b) the whole circuit will not work
c) no current will flow in that branch
d) The voltage drop in the open branch will increase
Answer- c
87. What is the unit of resistivity?
a) ohm/cm
b) ohm/cm
2
c) Ohm-meter
d) ohm/meter
Answer- c
88. Which type of resistance is used for arc extinguishing protection in circuit breakers?
a) varistors
b) Sensistors
c) Thermistors
d) Light dependent resistor
Answer- a
89. What is the use of series circuit?
a) voltmeter connection
b) Optical circuits in homes
c) shunt resistance in ammeter
d) multiplier resistance of voltmeter
Answer- d
90. What is the effect of open resistance in a series circuit?
a) no effect in open resistance
b) full circuit current will flow through the open resistance
c) The total supply voltage will appear on both sides of the open resistance
d) no voltage will appear on either side of the open resistance
Answer- c
91. What is the name of resistance if its resistance value increases with increase in temperature?
a) Varistors b) Sensistors
c) Thermistors d) Light dependent resistors
Answer- b
a) the current will remain the same
b) the whole circuit will not work
c) no current will flow in that branch
d) The voltage drop in the open branch will increase
Answer- c
87. What is the unit of resistivity?
a) ohm/cm
b) ohm/cm
2
c) Ohm-meter
d) ohm/meter
Answer- c
88. Which type of resistance is used for arc extinguishing protection in circuit breakers?
a) varistors
b) Sensistors
c) Thermistors
d) Light dependent resistor
Answer- a
89. What is the use of series circuit?
a) voltmeter connection
b) Optical circuits in homes
c) shunt resistance in ammeter
d) multiplier resistance of voltmeter
Answer- d
90. What is the effect of open resistance in a series circuit?
a) no effect in open resistance
b) full circuit current will flow through the open resistance
c) The total supply voltage will appear on both sides of the open resistance
d) no voltage will appear on either side of the open resistance
Answer- c
91. What is the name of resistance if its resistance value increases with increase in temperature?
a) Varistors b) Sensistors
c) Thermistors d) Light dependent resistors
Answer- b
92. What is the formula of electrical quantity?
a) Current x Time
b) voltage x current
c) current x resistance
d) voltage x resistance
Answer- a
93. What is the unit of conductivity?
a) Mho
b) Ohm
c) Ohm
d) Ohm/m
Answer: a
94. What defines the change in resistance in ohms per degree centigrade?
a) Temperature effect
b) Temperature rules
c) Temperature constant
d) temperature coefficient
Answer- d
95. What is the use of series circuit?
a) fuse in the circuit
b) voltmeter connection
c) Electric lamps in homes
d) shunt resistor in emitter
Answer- a
96. Which method is used for measurement from 1 Ohm to 100K Ohm?
a) replacement method
b) Kelvin bridge method
c) Wheatstone bridge method
d) Voltmeter and ammeter method
Answer- c
97. What is the SI unit of specific resistance?
a) Ohm/cm b) Ohm/metre
2
c) Ohm-meter d) Micro Ohm/cm
2
Ans. c
a) Current x Time
b) voltage x current
c) current x resistance
d) voltage x resistance
Answer- a
93. What is the unit of conductivity?
a) Mho
b) Ohm
c) Ohm
d) Ohm/m
Answer: a
94. What defines the change in resistance in ohms per degree centigrade?
a) Temperature effect
b) Temperature rules
c) Temperature constant
d) temperature coefficient
Answer- d
95. What is the use of series circuit?
a) fuse in the circuit
b) voltmeter connection
c) Electric lamps in homes
d) shunt resistor in emitter
Answer- a
96. Which method is used for measurement from 1 Ohm to 100K Ohm?
a) replacement method
b) Kelvin bridge method
c) Wheatstone bridge method
d) Voltmeter and ammeter method
Answer- c
97. What is the SI unit of specific resistance?
a) Ohm/cm b) Ohm/metre
2
c) Ohm-meter d) Micro Ohm/cm
2
Ans. c
98. What change occurs in the value of resistance in a motor if its cross-sectional area is doubled?
a) No change
b) it decreases by two times
c) it becomes twice as much
d) decreases by four times
Answer- b
99. What will be the resistance of a light dependent register if the intensity of light is increased?
a) will increase
b) decrease
c) will remain the same
d) will become infinite
Answer- b
100. What is the formula to calculate power in a DC circuit?
a) voltage x time
b) current x voltage
c) current x resistance
d) voltage x resistance
Answer- b
101. What is the value of resistance in an open circuit?
a) Zero
b) less
c) More
d) Infinite
Answer- d
102. What is the specific resistance value of copper conductor?
a) 1.72 Ohm/
cm3
b) 1.72 Micro ohm
c) 1.72 Micro ohm/cm
3
d) 1.72 Micro ohm/m
Ans. c
103. What is inversely proportional to the resistance of the motor?
a) length
b) resistivity
c) Temperature
d) Cross-sectional area
Answer- d
a) No change
b) it decreases by two times
c) it becomes twice as much
d) decreases by four times
Answer- b
99. What will be the resistance of a light dependent register if the intensity of light is increased?
a) will increase
b) decrease
c) will remain the same
d) will become infinite
Answer- b
100. What is the formula to calculate power in a DC circuit?
a) voltage x time
b) current x voltage
c) current x resistance
d) voltage x resistance
Answer- b
101. What is the value of resistance in an open circuit?
a) Zero
b) less
c) More
d) Infinite
Answer- d
102. What is the specific resistance value of copper conductor?
a) 1.72 Ohm/
cm3
b) 1.72 Micro ohm
c) 1.72 Micro ohm/cm
3
d) 1.72 Micro ohm/m
Ans. c
103. What is inversely proportional to the resistance of the motor?
a) length
b) resistivity
c) Temperature
d) Cross-sectional area
Answer- d
104. How can the value of capacitance be reduced?
a) by increasing the plate area
b) by increasing the resistance of the plates
c) by increasing the distance between the plates
d) By using material with high electric constant
Answer- c
105. Which is a paramagnetic material?
a) Air
b) steel
c) Water
d) Platinum
Answer- c
106. Which factor affects the polarity of an electromagnet?
a) length of the coil
b) direction of current
c) power of the current
d) strength of the magnetic field
Answer- b
107. What is the unit of magnetic carrying force?
a) Ampere/m
2
b) Ampere- m
c) Ampere turns
d) Ampere / turns
Ans. c
108. What is the unit of Permeance?
a) Ampere turns
b) Weber/Ampere turns
c) Ampere turns/Weber
d) Weber/Square metre
Ans.b
109. Which rule is applied to find the direction of magnetic field in a solenoid coil?
a) corkscrew rule b) right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- b
a) by increasing the plate area
b) by increasing the resistance of the plates
c) by increasing the distance between the plates
d) By using material with high electric constant
Answer- c
105. Which is a paramagnetic material?
a) Air
b) steel
c) Water
d) Platinum
Answer- c
106. Which factor affects the polarity of an electromagnet?
a) length of the coil
b) direction of current
c) power of the current
d) strength of the magnetic field
Answer- b
107. What is the unit of magnetic carrying force?
a) Ampere/m
2
b) Ampere- m
c) Ampere turns
d) Ampere / turns
Ans. c
108. What is the unit of Permeance?
a) Ampere turns
b) Weber/Ampere turns
c) Ampere turns/Weber
d) Weber/Square metre
Ans.b
109. Which rule is applied to find the direction of magnetic field in a solenoid coil?
a) corkscrew rule b) right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- b
110. What precautions should be taken before connecting capacitors of different voltage ratings in
series?
a) All capacitors must be from the same manufacturer
b) Each capacitor voltage drop should be less than its voltage rating
c) The value of total capacitor should be less than the minimum value of capacitor
d) The breakdown voltage of each capacitor must be the same
Answer- b
111. Which substance is a paramagnetic substance?
a) cleat wiring
b) Copper
c) Bismuth
d) Graphite
Answer- b
112. Name the portion marked by x in the BH curve.
a) Coercivity
b) Saturation point
c) Magnetizing force
d) Residual magnetism
Answer: a
113. What is the equivalent term in magnetic circuits for “conductivity” in electric circuits?
a) Reluctivity
b) Permeability
c) Reluctance
d) Permeability
Ans.b
114. What is the unit of Reluctance?
a) Weber/metre
2
b) Weber/metre
c) Ampere turns/Weber d) Ampere turns/metre
2
Ans. c
series?
a) All capacitors must be from the same manufacturer
b) Each capacitor voltage drop should be less than its voltage rating
c) The value of total capacitor should be less than the minimum value of capacitor
d) The breakdown voltage of each capacitor must be the same
Answer- b
111. Which substance is a paramagnetic substance?
a) cleat wiring
b) Copper
c) Bismuth
d) Graphite
Answer- b
112. Name the portion marked by x in the BH curve.
a) Coercivity
b) Saturation point
c) Magnetizing force
d) Residual magnetism
Answer: a
113. What is the equivalent term in magnetic circuits for “conductivity” in electric circuits?
a) Reluctivity
b) Permeability
c) Reluctance
d) Permeability
Ans.b
114. What is the unit of Reluctance?
a) Weber/metre
2
b) Weber/metre
c) Ampere turns/Weber d) Ampere turns/metre
2
Ans. c
115. How can you increase the pulling power of a magnet?
a) increase the field intensity
b) reduce the current in the coil
c) reduce the number of turns in the coil
d) Increase the BH curve of the product
Answer- a
116. What effect does a magnetic field have on the surrounding metal?
a) Hysteresis
b) Skin effect
c) Eddy current
d) Dielectric stress
Ans. c
117. In which device is air capacitor used?
a) TV tuner
b) Oscillator
c) Loudspeaker
d) Radio receiver
Ans.d
118. What will happen if a polarized electrolytic capacitor is connected oppositely?
a) no effect on capacitor
b) Explosion due to excessive heat
c) current in the circuit decreases
d) The value of samdharita will be increased
Answer- b
119. Which is a paramagnetic material?
a) Wood
b) Nickel
c) Platinum
d) Manganese
Answer- a
120. What is the SI unit of flux density?
a) Tesla b) Weber
c) Weber/Meter d) Ampere Turn
Answer- a
a) increase the field intensity
b) reduce the current in the coil
c) reduce the number of turns in the coil
d) Increase the BH curve of the product
Answer- a
116. What effect does a magnetic field have on the surrounding metal?
a) Hysteresis
b) Skin effect
c) Eddy current
d) Dielectric stress
Ans. c
117. In which device is air capacitor used?
a) TV tuner
b) Oscillator
c) Loudspeaker
d) Radio receiver
Ans.d
118. What will happen if a polarized electrolytic capacitor is connected oppositely?
a) no effect on capacitor
b) Explosion due to excessive heat
c) current in the circuit decreases
d) The value of samdharita will be increased
Answer- b
119. Which is a paramagnetic material?
a) Wood
b) Nickel
c) Platinum
d) Manganese
Answer- a
120. What is the SI unit of flux density?
a) Tesla b) Weber
c) Weber/Meter d) Ampere Turn
Answer- a
121. What is the effect on an electrolytic capacitor if an open circuit fault occurs?
a) It will not work
b) it will explode at once
c) it will leak
d) It will function normally
Answer- a
122. Which type of capacitor is used for space electronics?
a) Plastic film
b) Ceramic disc
c) Electrolytic aluminium
d) electrolytic tantalum
Answer- d
123. Which method of magnetisation is used to make permanent magnets for commercial
purposes?
a) Induction method
b) Single touch method
c) Double touch method
d) Split touch method
Answer- a
124. By which rule do secondary cells function?
a) Lenz's law
b) Joule's law
c) Faraday's law of electrolysis
d) Faraday's law of electromagnetic induction
Answer- c
125. How is battery capacity stated?
a) Volt
b) Watt
c) Volt Ampere
d) Ampere hour
Answer- d
126. What is the unit of electric charge?
a) volt b) watt
c) Ampere d) Coulomb
Answer- d
a) It will not work
b) it will explode at once
c) it will leak
d) It will function normally
Answer- a
122. Which type of capacitor is used for space electronics?
a) Plastic film
b) Ceramic disc
c) Electrolytic aluminium
d) electrolytic tantalum
Answer- d
123. Which method of magnetisation is used to make permanent magnets for commercial
purposes?
a) Induction method
b) Single touch method
c) Double touch method
d) Split touch method
Answer- a
124. By which rule do secondary cells function?
a) Lenz's law
b) Joule's law
c) Faraday's law of electrolysis
d) Faraday's law of electromagnetic induction
Answer- c
125. How is battery capacity stated?
a) Volt
b) Watt
c) Volt Ampere
d) Ampere hour
Answer- d
126. What is the unit of electric charge?
a) volt b) watt
c) Ampere d) Coulomb
Answer- d
127. What is the output voltage of a lithium cell?
a) 1.2V
b) 1.5V
c) 1.8V
d) 2.5V
Ans.d
128. Which method is adopted to charge the battery at a high rate in a short time?
a) Initial charge
b) Boost charge
c) trickle charge
d) Freshening Charges
Answer- b
129. Which electrolyte is used in carbon zinc dry cell?
a) dilute sulphuric acid
b) Ammonium Chloride
c) Potassium hydroxide
d) concentrated sulphuric acid
Answer- b
130. What is the effect of flowing electric current in liquids?
a) Thermal
b) Optical
c) Magnetic
d) Chemical
Answer- d
131. Which material is used to make the negative plate in lead acid battery?
a) Lead dioxide
b) Sponge Lad
c) Lead peroxide
d) Lead sulphate
Answer- b
132. Which technique is used to control corrosion of metal surfaces?
a) Anodic protection b) Cathodic protection
c) Electrolyte protection d) Static electricity protection
Answer- b
a) 1.2V
b) 1.5V
c) 1.8V
d) 2.5V
Ans.d
128. Which method is adopted to charge the battery at a high rate in a short time?
a) Initial charge
b) Boost charge
c) trickle charge
d) Freshening Charges
Answer- b
129. Which electrolyte is used in carbon zinc dry cell?
a) dilute sulphuric acid
b) Ammonium Chloride
c) Potassium hydroxide
d) concentrated sulphuric acid
Answer- b
130. What is the effect of flowing electric current in liquids?
a) Thermal
b) Optical
c) Magnetic
d) Chemical
Answer- d
131. Which material is used to make the negative plate in lead acid battery?
a) Lead dioxide
b) Sponge Lad
c) Lead peroxide
d) Lead sulphate
Answer- b
132. Which technique is used to control corrosion of metal surfaces?
a) Anodic protection b) Cathodic protection
c) Electrolyte protection d) Static electricity protection
Answer- b
133. What is the function of the fine selector switch in a battery charger?
a) choice of current rating
b) choice of charging time
c) Selection of voltage gauge
d) choice of charging method
Answer- a
134. What will be the effect on the output power of a solar cell with respect to temperature?
a) no effect in temperature
b) increases with increase in temperature
c) decrease with increase in temperature
d) decrease with decrease in temperature
Answer- d
135. What is the purpose of a hydrometer while charging a battery?
a) Determine the AH capacity
b) To find out the battery voltage level
c) To find out the discharge level of the battery
d) To determine the specific gravity of an electrolyte
Answer- d
136. What is used as electrolyte in lead acid batteries?
a) hydraulic acid
b) Ammonium Chloride
c) Potassium hydroxide
d) dilute sulfuric acid
Answer- d
137. What will happen to the positive plate during the chemical reaction of charging a lead acid
battery?
a) Sponge Lad
b) Lead peroxide
c) Lead sulphate
d) Lead sulphate + water
Answer- b
138. In which method the battery is charged for a long time at low current?
a) Rectifier method b) Trickle charging method
c) Constant current method d) Constant potential method
Answer- b
a) choice of current rating
b) choice of charging time
c) Selection of voltage gauge
d) choice of charging method
Answer- a
134. What will be the effect on the output power of a solar cell with respect to temperature?
a) no effect in temperature
b) increases with increase in temperature
c) decrease with increase in temperature
d) decrease with decrease in temperature
Answer- d
135. What is the purpose of a hydrometer while charging a battery?
a) Determine the AH capacity
b) To find out the battery voltage level
c) To find out the discharge level of the battery
d) To determine the specific gravity of an electrolyte
Answer- d
136. What is used as electrolyte in lead acid batteries?
a) hydraulic acid
b) Ammonium Chloride
c) Potassium hydroxide
d) dilute sulfuric acid
Answer- d
137. What will happen to the positive plate during the chemical reaction of charging a lead acid
battery?
a) Sponge Lad
b) Lead peroxide
c) Lead sulphate
d) Lead sulphate + water
Answer- b
138. In which method the battery is charged for a long time at low current?
a) Rectifier method b) Trickle charging method
c) Constant current method d) Constant potential method
Answer- b
139. Which material is used as (-ve) electrode in silver oxide battery?
a) zinc b) copper c) carbon d) silver oxide
Answer- a
140. What is the electrochemical equivalent of silver?
a) 0.001182 mg/coulomb b) 0.01182 mg/coulomb
c) 0.1182 mg/coulomb d) 1.1182 mg/coulomb
Ans.d
141. What will happen to the negative plate during the chemical process of discharging a lead acid
battery?
a) Sponge Lad
b) Lead peroxide
c) Lead sulphate
d) Lead sulphate + Water
Answer- c
142. Which instrument is used to measure the specific gravity of lead acid battery?
a) Barometer
b) Hydrometer
c) Anima meter
d) High rate discharge tester
Answer- b
143. What is the effect of buckling defect in lead acid battery?
a) bending of electrodes
b) Decrease in the strength of the electrolyte
c) short circuit between the electrodes
d) increase in internal resistance
Answer- a
144. What is the total output voltage of the circuit?
a) 0 V b) 1.5 V c) 3.0 V d) 4.5 V
Ans.d
a) zinc b) copper c) carbon d) silver oxide
Answer- a
140. What is the electrochemical equivalent of silver?
a) 0.001182 mg/coulomb b) 0.01182 mg/coulomb
c) 0.1182 mg/coulomb d) 1.1182 mg/coulomb
Ans.d
141. What will happen to the negative plate during the chemical process of discharging a lead acid
battery?
a) Sponge Lad
b) Lead peroxide
c) Lead sulphate
d) Lead sulphate + Water
Answer- c
142. Which instrument is used to measure the specific gravity of lead acid battery?
a) Barometer
b) Hydrometer
c) Anima meter
d) High rate discharge tester
Answer- b
143. What is the effect of buckling defect in lead acid battery?
a) bending of electrodes
b) Decrease in the strength of the electrolyte
c) short circuit between the electrodes
d) increase in internal resistance
Answer- a
144. What is the total output voltage of the circuit?
a) 0 V b) 1.5 V c) 3.0 V d) 4.5 V
Ans.d
145. What is used as the positive electrode in a dry cell?
a) Zinc
b) carbon
c) Copper
d) Lithium
Answer- b
146. What will happen to the voltage at the ends of the cell when the load is increased?
a) will increase
b) decrease
c) will remain at zero
d) will remain the same
Answer- b
147. What is the electrochemical equivalent of copper?
a) 0.329 mg/coulomb
b) 0.329 g/coulomb
c) 1.1182 mg/coulomb
d) 1.1182 g/coulomb
Answer: a
148. What is the cause of buckling defect in lead acid batteries?
a) over charging or over discharging
b) Charging with lower rate for shorter period
c) formation of sediments falling from the plate
d) keeping the battery in a discharged state for a long period
Answer- a
149. Which part is losing electrons during electrolysis?
a) Cathode
b) Anode
c) electrolyte
d) Separator
Answer- b
150. How are conduit pipes specified
a) Length in metres b) Wall thickness in mm
c) Inner diameter in mm d) Outer diameter in mm
Answer- d
a) Zinc
b) carbon
c) Copper
d) Lithium
Answer- b
146. What will happen to the voltage at the ends of the cell when the load is increased?
a) will increase
b) decrease
c) will remain at zero
d) will remain the same
Answer- b
147. What is the electrochemical equivalent of copper?
a) 0.329 mg/coulomb
b) 0.329 g/coulomb
c) 1.1182 mg/coulomb
d) 1.1182 g/coulomb
Answer: a
148. What is the cause of buckling defect in lead acid batteries?
a) over charging or over discharging
b) Charging with lower rate for shorter period
c) formation of sediments falling from the plate
d) keeping the battery in a discharged state for a long period
Answer- a
149. Which part is losing electrons during electrolysis?
a) Cathode
b) Anode
c) electrolyte
d) Separator
Answer- b
150. How are conduit pipes specified
a) Length in metres b) Wall thickness in mm
c) Inner diameter in mm d) Outer diameter in mm
Answer- d
ITI Question Bank (2
nd Year)
1. What is the name of the part marked as x in a DC generator?
a) armature core b) brushes
c) commutator resistor d) commutator segments
Answer- c
2. Which rule is used to find the direction of induced EMF in a DC generator?
a) corkscrew rule b) right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- d
3. Which formula is used to calculate the EMF generated in a DC generator?
a) Generated emf =
b) Generated emf =
c) Generated emf =
d) Resultant emf =
Answer- c
4. What is the name of the part marked as x in a DC generator?
a) pole tip
b) pole coil
c) pole core
d) pole shoe
Answer- d
nd Year)
1. What is the name of the part marked as x in a DC generator?
a) armature core b) brushes
c) commutator resistor d) commutator segments
Answer- c
2. Which rule is used to find the direction of induced EMF in a DC generator?
a) corkscrew rule b) right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- d
3. Which formula is used to calculate the EMF generated in a DC generator?
a) Generated emf =
b) Generated emf =
c) Generated emf =
d) Resultant emf =
Answer- c
4. What is the name of the part marked as x in a DC generator?
a) pole tip
b) pole coil
c) pole core
d) pole shoe
Answer- d
5. Which energy is converted into electrical energy by the generator?
a) Heat
b) Dynamic
c) Chemical
d) mechanical
Answer- d
6. What is the principle of DC generator?
a) Cork screw rule
b) Fleming's left hand rule
c) Fleming's right hand rule
d) Faraday's law of electromagnetic induction
Answer- d
7. Which rule is used to find the direction of magnetic field?
a) Cork screw rule
b) Right hand palm rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- d
8. What is the name of the part of a DC generator?
a) stator
b) pole core
c) pole shoe
d) yoke or frame
Answer- d
9. How many parallel paths are there in the duplex lap winding of a 4 pole DC generator?
(a) 4 ( b) 6 (c) 8 (d) 12
Ans. c
a) Heat
b) Dynamic
c) Chemical
d) mechanical
Answer- d
6. What is the principle of DC generator?
a) Cork screw rule
b) Fleming's left hand rule
c) Fleming's right hand rule
d) Faraday's law of electromagnetic induction
Answer- d
7. Which rule is used to find the direction of magnetic field?
a) Cork screw rule
b) Right hand palm rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- d
8. What is the name of the part of a DC generator?
a) stator
b) pole core
c) pole shoe
d) yoke or frame
Answer- d
9. How many parallel paths are there in the duplex lap winding of a 4 pole DC generator?
(a) 4 ( b) 6 (c) 8 (d) 12
Ans. c
10. Name the parts of DC generator?
a) Side end plates
b) Pole shoe lamination
c) commutator segment
d) Armature core lamination
Answer- d
11. How are interpoles connected in a DC generator?
a) in series with the armature
b) in parallel with the armature
c) in series with the shunt field
d) in parallel with the shunt field
Answer- a
12. What is the name of the compound generator, if the shunt field is connected in parallel with the
armature?
a) long shunt compound
b) cumulative compound
c) Differential Compound
d) short shunt compound
Answer- d
13. Why is the armature core of a DC generator laminated?
a) Reduce copper loss
b) reduce friction loss
c) reduce hysteresis loss
d) Reduce eddy current losses
Answer- d
14. Why should a DC generator run only in clockwise direction?
a) Protect the brush from damage
b) protect residual magnetism
c) avoid short circuit in armature
d) Avoid overloading the generator
Answer- b
a) Side end plates
b) Pole shoe lamination
c) commutator segment
d) Armature core lamination
Answer- d
11. How are interpoles connected in a DC generator?
a) in series with the armature
b) in parallel with the armature
c) in series with the shunt field
d) in parallel with the shunt field
Answer- a
12. What is the name of the compound generator, if the shunt field is connected in parallel with the
armature?
a) long shunt compound
b) cumulative compound
c) Differential Compound
d) short shunt compound
Answer- d
13. Why is the armature core of a DC generator laminated?
a) Reduce copper loss
b) reduce friction loss
c) reduce hysteresis loss
d) Reduce eddy current losses
Answer- d
14. Why should a DC generator run only in clockwise direction?
a) Protect the brush from damage
b) protect residual magnetism
c) avoid short circuit in armature
d) Avoid overloading the generator
Answer- b
15. What is the reason why a DC generator fails to produce voltage?
a) loose brush combination
b) armature resistance is high
c) field resistance is above the critical resistance
d) prime mover is running above rated speed
Answer- c
16. What is the purpose of pole shoe in DC generator?
a) reduce the air gap
b) increase the field strength
c) reduce magnetic losses
d) spread the flux evenly in the air gap
Answer- d
17. What is the name of the generator, if its field is connected in parallel to the armature?
a) shunt generator
b) Series generator
c) Compound generator
d) self excited generator
Answer- a
18. What is the function of split ring in DC generator?
a) maintain constant voltage
b) collects current in one direction
c) reduces the voltage drop across the brush
d) terminal voltage increases compared to rated
Answer- b
19. Which material is used to make brushes in generators?
a) steel and graphite
b) carbon and graphite
c) Cast iron and graphite
d) aluminum and graphite
Answer- b
20. Why do DC generators give off their residual magnetism?
a) Severe short circuit in the load b) Continuous running with no load
c) Continuous movement without stopping d) Frequent change of direction of rotation
Answer- d
a) loose brush combination
b) armature resistance is high
c) field resistance is above the critical resistance
d) prime mover is running above rated speed
Answer- c
16. What is the purpose of pole shoe in DC generator?
a) reduce the air gap
b) increase the field strength
c) reduce magnetic losses
d) spread the flux evenly in the air gap
Answer- d
17. What is the name of the generator, if its field is connected in parallel to the armature?
a) shunt generator
b) Series generator
c) Compound generator
d) self excited generator
Answer- a
18. What is the function of split ring in DC generator?
a) maintain constant voltage
b) collects current in one direction
c) reduces the voltage drop across the brush
d) terminal voltage increases compared to rated
Answer- b
19. Which material is used to make brushes in generators?
a) steel and graphite
b) carbon and graphite
c) Cast iron and graphite
d) aluminum and graphite
Answer- b
20. Why do DC generators give off their residual magnetism?
a) Severe short circuit in the load b) Continuous running with no load
c) Continuous movement without stopping d) Frequent change of direction of rotation
Answer- d
21. How is the magnetic circuit completed through the yoke and pole in a generator?
a) Field coil
b) armature core
c) Laminated pole core
d) winding conductors in armature
Answer- b
22. Why does the terminal voltage decrease as the load increases in a DC shunt generator?
a) due to armature reaction effect
b) due to increase in armature resistance
c) The drop due to brush voltage is reduced
d) due to increase in shunt field inductance
Answer- a
23. Which type of DC generator is used for long distance distribution lines?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- d
24. Which method is used to improve the insulation resistance in a DC generator?
a) replace brushes frequently
b) warming up the machine from time to time
c) Regularly cleaning the commutator segments
d) Blowing hot air into the machine during maintenance
Answer- d
25. Which type of DC generator is used for arc welding?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- c
26. What is the characteristic of wave winding in DC generator?
a) low current low voltage b) high current low voltage
c) low current high voltage d) high current high voltage
Answer- c
a) Field coil
b) armature core
c) Laminated pole core
d) winding conductors in armature
Answer- b
22. Why does the terminal voltage decrease as the load increases in a DC shunt generator?
a) due to armature reaction effect
b) due to increase in armature resistance
c) The drop due to brush voltage is reduced
d) due to increase in shunt field inductance
Answer- a
23. Which type of DC generator is used for long distance distribution lines?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- d
24. Which method is used to improve the insulation resistance in a DC generator?
a) replace brushes frequently
b) warming up the machine from time to time
c) Regularly cleaning the commutator segments
d) Blowing hot air into the machine during maintenance
Answer- d
25. Which type of DC generator is used for arc welding?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- c
26. What is the characteristic of wave winding in DC generator?
a) low current low voltage b) high current low voltage
c) low current high voltage d) high current high voltage
Answer- c
27. What is the purpose of resistance wire used in the commutator connection in a DC generator?
a) maintain constant voltage
b) zero statically induced emf
c) increasing the statically induced emf
d) easy reversal of current direction
Answer- d
28. Why solid pole shoe is used in DC generator?
a) To reduce copper losses
b) To increase the residual magnetism
c) To reduce residual magnetism
d) To reduce the reluctance of the magnetic path
Answer- d
29. Which metal is used to make high capacity DC generator yokes?
a) Cast iron
b) malleable iron
c) Aluminum
d) Rolled steel
Answer- d
30. What is the function of split rings in a DC generator?
a) supplying continuous output
b) produce output in one direction
c) outputs in the opposite direction
d) collects output from alternating conductor
Answer- b
31. What type of voltage is dynamically induced in a DC generator?
a) pulsating voltage
b) oscillating voltage
c) alternating voltage
d) direct current voltage
Answer- c
a) maintain constant voltage
b) zero statically induced emf
c) increasing the statically induced emf
d) easy reversal of current direction
Answer- d
28. Why solid pole shoe is used in DC generator?
a) To reduce copper losses
b) To increase the residual magnetism
c) To reduce residual magnetism
d) To reduce the reluctance of the magnetic path
Answer- d
29. Which metal is used to make high capacity DC generator yokes?
a) Cast iron
b) malleable iron
c) Aluminum
d) Rolled steel
Answer- d
30. What is the function of split rings in a DC generator?
a) supplying continuous output
b) produce output in one direction
c) outputs in the opposite direction
d) collects output from alternating conductor
Answer- b
31. What type of voltage is dynamically induced in a DC generator?
a) pulsating voltage
b) oscillating voltage
c) alternating voltage
d) direct current voltage
Answer- c
32. What is the purpose of the slot marked x?
a) To fix the key way
b) To create air circulation
c) For lubricant purpose
d) For easy removal from the shaft
Answer- a
33. Which metal is used to make pole cores of large DC generator machines?
a) malleable iron
b) Cast iron
c) Cast steel
d) Stainless steel
Answer- c
34. Which type of DC generator is used for electroplating process?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- a
35. What is the purpose of compensating winding in a DC generator?
a) Reduces rigorous commutation
b) maintain constant output voltage
c) neutralises the demagnetisation effect
d) decreases the excitation current of the field coil
Answer- c
36. What is the effect of armature reaction in a DC generator?
a) the output voltage increases
b) the output voltage decreases
c) the output voltage is pulsating
d) the output voltage will become zero
Answer- b
a) To fix the key way
b) To create air circulation
c) For lubricant purpose
d) For easy removal from the shaft
Answer- a
33. Which metal is used to make pole cores of large DC generator machines?
a) malleable iron
b) Cast iron
c) Cast steel
d) Stainless steel
Answer- c
34. Which type of DC generator is used for electroplating process?
a) shunt generator
b) Series generator
c) Differential Compound Generator
d) cumulative compound generator
Answer- a
35. What is the purpose of compensating winding in a DC generator?
a) Reduces rigorous commutation
b) maintain constant output voltage
c) neutralises the demagnetisation effect
d) decreases the excitation current of the field coil
Answer- c
36. What is the effect of armature reaction in a DC generator?
a) the output voltage increases
b) the output voltage decreases
c) the output voltage is pulsating
d) the output voltage will become zero
Answer- b
37. How can the effect of armature reaction be neutralised in a large DC generator?
a) by using compensating winding
b) Providing additional inter poles
c) increase in brush contact resistance
d) connecting resistance wires to the windings
Answer- a
38. What effect occurs to a DC generator if it is kept switched off for a long time?
a) field coil resistance increases
b) armature resistance increases
c) armature reaction increases
d) loses its residual magnetism
Answer- d
39. If the main field flux is distorted in a DC generator, what is the effect on the induced emf?
a) induced emf increases
b) induced emf decreases
c) no change in induced emf
d) induced emf becomes zero
Answer- b
40. What is the reason for heavy sparking in the brushes of DC generator?
a) short circuit in the field winding
b) short circuit in armature winding
c) MNA and GNA status changed
d) very high spring tension in the form of brushes
Answer- c
41. Which instrument is used to measure armature winding resistance?
a) Megger
b) Multimeter
c) Series type ohm meter
d) Kelvin Bridge
Answer- d
42. Which instrument is used to test armature winding for short and open circuit?
a) Tongue tester b) Internal growler
c) External growler d) Digital multimeter
Answer- c
a) by using compensating winding
b) Providing additional inter poles
c) increase in brush contact resistance
d) connecting resistance wires to the windings
Answer- a
38. What effect occurs to a DC generator if it is kept switched off for a long time?
a) field coil resistance increases
b) armature resistance increases
c) armature reaction increases
d) loses its residual magnetism
Answer- d
39. If the main field flux is distorted in a DC generator, what is the effect on the induced emf?
a) induced emf increases
b) induced emf decreases
c) no change in induced emf
d) induced emf becomes zero
Answer- b
40. What is the reason for heavy sparking in the brushes of DC generator?
a) short circuit in the field winding
b) short circuit in armature winding
c) MNA and GNA status changed
d) very high spring tension in the form of brushes
Answer- c
41. Which instrument is used to measure armature winding resistance?
a) Megger
b) Multimeter
c) Series type ohm meter
d) Kelvin Bridge
Answer- d
42. Which instrument is used to test armature winding for short and open circuit?
a) Tongue tester b) Internal growler
c) External growler d) Digital multimeter
Answer- c
43. What is the name of the speed control method of DC motor?
a) Field diverter method
b) Field tapping method
c) Voltage control method
d) Armature diverter method
Answer- d
44. Which winding wire is used for DC field coil?
a) Super enamelled copper wire
b) Single silk covered copper wire
c) Double silk covered copper wire
d) PVC covered copper winding wire
Answer- a
45. Which formula is used to calculate the speed of a DC motor?
a)
b)
c)
d)
Answer: a
46. How many parallel paths are there in the duplex lap winding in the armature of a 4 pole DC
motor ,
a) 2 b) 4 c) 6 d) 8
Answer: a
47. Which law determines the direction of rotation of the armature in a DC motor?
a) Right hand grip rule
b) Right hand palm rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- c
a) Field diverter method
b) Field tapping method
c) Voltage control method
d) Armature diverter method
Answer- d
44. Which winding wire is used for DC field coil?
a) Super enamelled copper wire
b) Single silk covered copper wire
c) Double silk covered copper wire
d) PVC covered copper winding wire
Answer- a
45. Which formula is used to calculate the speed of a DC motor?
a)
b)
c)
d)
Answer: a
46. How many parallel paths are there in the duplex lap winding in the armature of a 4 pole DC
motor ,
a) 2 b) 4 c) 6 d) 8
Answer: a
47. Which law determines the direction of rotation of the armature in a DC motor?
a) Right hand grip rule
b) Right hand palm rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- c
48. What is the name of DC motor?
a) DC shunt motor b) DC series motor
c) DC differential compound motor d) DC cumulative compound motor
Answer- a
49. By which law is the direction of current in a DC motor determined?
a) Right hand grip rule b) Right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- d
50. What is the formula to calculate the current drawn by a DC shunt motor armature?
a)
b)
c)
d)
Ans. c
51. Which rule is applied to identify the direction of flux in a DC motor?
a) Cork screw rule
b) Right hand grip rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- c
52. What is the purpose of series resistor connected across the holding coil in DC four point?
a) limit the current in the holding coil
b) increase the current in the holding coil
c) increase the voltage in holding coil
d) reduce the voltage in the holding coil
Answer- a
a) DC shunt motor b) DC series motor
c) DC differential compound motor d) DC cumulative compound motor
Answer- a
49. By which law is the direction of current in a DC motor determined?
a) Right hand grip rule b) Right hand palm rule
c) Fleming's left hand rule d) Fleming's right hand rule
Answer- d
50. What is the formula to calculate the current drawn by a DC shunt motor armature?
a)
b)
c)
d)
Ans. c
51. Which rule is applied to identify the direction of flux in a DC motor?
a) Cork screw rule
b) Right hand grip rule
c) Fleming's left hand rule
d) Fleming's right hand rule
Answer- c
52. What is the purpose of series resistor connected across the holding coil in DC four point?
a) limit the current in the holding coil
b) increase the current in the holding coil
c) increase the voltage in holding coil
d) reduce the voltage in the holding coil
Answer- a
53. Name the DC motor type
a) shunt motor
b) class motor
c) long shunt compound motor
d) short shunt compound motor
Answer- d
54. What is the name of the instrument?
a) Megger b) Earth resistance tester c) Internal growler d) External growler
Answer- d
55. Which speed control method of DC series motor is used for electric trains?
a) Field diverter method b) Field tapping method
c) Armature diverter method d) Supply voltage control method
Answer- a
56. Why is the shunt field coil connected in series with the holding coil in a DC three point starter?
a) increase the holding coil current
b) decrease the holding coil current
c) protect the shunt field from current
d) Protect the motor in case the shunt field is open
Answer- d
a) shunt motor
b) class motor
c) long shunt compound motor
d) short shunt compound motor
Answer- d
54. What is the name of the instrument?
a) Megger b) Earth resistance tester c) Internal growler d) External growler
Answer- d
55. Which speed control method of DC series motor is used for electric trains?
a) Field diverter method b) Field tapping method
c) Armature diverter method d) Supply voltage control method
Answer- a
56. Why is the shunt field coil connected in series with the holding coil in a DC three point starter?
a) increase the holding coil current
b) decrease the holding coil current
c) protect the shunt field from current
d) Protect the motor in case the shunt field is open
Answer- d
57. Which insulator material belongs to category B insulator?
a) Cotton
b) Bamboo
c) Fiber glass
d) Leather paper
Answer- c
58. What is the temperature value of category 'F' insulation?
b) 90
0
C
b) 105
0C
c) 120
0C
d) 155
0C
Ans.d
59. Which type of DC motor is used for constant speed drives?
a) DC series motor
b) DC shunt motor
c) Differential long shunt compound motor
d) Differential short compound motor
Answer- b
60. Which type of DC motor is used in lift?
a) DC series motor
b) DC shunt motor
c) Differential long shunt compound motor
d) DC cumulative compound motor
Answer- d
61. Which method of speed control gives speed below rated speed in DC series motor?
a) Field diverter method
b) Taped field method
c) Voltage control method
d) Armature diverter method
Answer- d
62. What is the effect, if the four point starter resistance is cutoff during running?
a) the motor will stop b) it will run slowly
c) moves at a very fast speed d) moves in the opposite direction
Answer- b
a) Cotton
b) Bamboo
c) Fiber glass
d) Leather paper
Answer- c
58. What is the temperature value of category 'F' insulation?
b) 90
0
C
b) 105
0C
c) 120
0C
d) 155
0C
Ans.d
59. Which type of DC motor is used for constant speed drives?
a) DC series motor
b) DC shunt motor
c) Differential long shunt compound motor
d) Differential short compound motor
Answer- b
60. Which type of DC motor is used in lift?
a) DC series motor
b) DC shunt motor
c) Differential long shunt compound motor
d) DC cumulative compound motor
Answer- d
61. Which method of speed control gives speed below rated speed in DC series motor?
a) Field diverter method
b) Taped field method
c) Voltage control method
d) Armature diverter method
Answer- d
62. What is the effect, if the four point starter resistance is cutoff during running?
a) the motor will stop b) it will run slowly
c) moves at a very fast speed d) moves in the opposite direction
Answer- b
63. Why are carbon composition brushes required in the armature circuit to operate a DC motor?
a) increases the starting torque
b) avoids armature reaction
c) protects the armature from overloading
d) reduces spark in the commutator segments
Answer- d
64. Why does a series motor produce high initial torque and speed without load?
a) absence of back emf
b) load current flows through the field winding
c) armature current and field current are equal
d) Winding wire in series field with thick wire
Answer- a
65. Why is the series field short-circuited at the time of starting in a differential compound motor?
a) to reduce the starting current
b) To increase the speed of the motor
c) To reduce the speed of the motor
d) To maintain the proper direction of rotation
Answer- d
66. What is the most effective way to balance an armature?
a) static equilibrium
b) dynamic equilibrium
c) attached with counter balance
d) Lead plugged with load balancing
Answer- b
67. Which material is used for starting resistance of DC starters?
a) Eureka
b) Nichrome
c) Manganin
d) Constantine
Answer- a
68. Which DC compound motor can be operated at constant speed at varying loads?
a) differential long shunt b) cumulative long shunt
c) differential short shunt d) cumulative short shunt
Answer- b
a) increases the starting torque
b) avoids armature reaction
c) protects the armature from overloading
d) reduces spark in the commutator segments
Answer- d
64. Why does a series motor produce high initial torque and speed without load?
a) absence of back emf
b) load current flows through the field winding
c) armature current and field current are equal
d) Winding wire in series field with thick wire
Answer- a
65. Why is the series field short-circuited at the time of starting in a differential compound motor?
a) to reduce the starting current
b) To increase the speed of the motor
c) To reduce the speed of the motor
d) To maintain the proper direction of rotation
Answer- d
66. What is the most effective way to balance an armature?
a) static equilibrium
b) dynamic equilibrium
c) attached with counter balance
d) Lead plugged with load balancing
Answer- b
67. Which material is used for starting resistance of DC starters?
a) Eureka
b) Nichrome
c) Manganin
d) Constantine
Answer- a
68. Which DC compound motor can be operated at constant speed at varying loads?
a) differential long shunt b) cumulative long shunt
c) differential short shunt d) cumulative short shunt
Answer- b
69. How is the no volt coil connected in tin point starter with DC shunt motor?
a) directly connected to the supply
b) connected in series with the armature
c) connected in parallel with the armature
d) connected in series with the shunt field
Answer- d
70. What type of armature winding is illustrated?
a) duplex lap winding
b) Triplex lap winding
c) Simplex lap winding
d) Kundruplex lap winding
Answer- a
71. Which Growler test for armature is illustrated?
a) Open coil test
b) Ground coil test
c) Shorted coil test
d) Shortened commutator test
Answer- a
72. Why is the commutator producing bright light?
a) Wrong position of brushes b) Wrong field connection
c) Wrong direction of rotation d) Wrong armature connection
Answer- a
a) directly connected to the supply
b) connected in series with the armature
c) connected in parallel with the armature
d) connected in series with the shunt field
Answer- d
70. What type of armature winding is illustrated?
a) duplex lap winding
b) Triplex lap winding
c) Simplex lap winding
d) Kundruplex lap winding
Answer- a
71. Which Growler test for armature is illustrated?
a) Open coil test
b) Ground coil test
c) Shorted coil test
d) Shortened commutator test
Answer- a
72. Why is the commutator producing bright light?
a) Wrong position of brushes b) Wrong field connection
c) Wrong direction of rotation d) Wrong armature connection
Answer- a
73. What is the action of induced emf in a running DC motor?
a) aids the applied voltage
b) opposes the applied voltage
c) increases the armature current
d) decreases armature current
Answer- b
74. Which motor has this feature?
a) series motor
b) shunt motor
c) cumulative compound motor
d) Differential compound motor
Answer- c
75. Why is the field winding of DC series motor wound with thick wire?
a) To regulate the field voltage b) To carry the load current
c) To keep maximum inductance d) To reduce armature reaction
Answer- b
76. Which type of DC motor is suitable for shearing machines?
a) shunt motor b) series motor
c) cumulative compound motor d) differential compound motor
Answer- c
77. Where are DC compound motors preferred?
a) constant load requirements b) constant speed requirements
c) High starting torque requirements d) Variable speed to suit varying load requirements
Answer- d
78. What type of instrument is used to test armature winding?
a) Megger b) Growler c) Multimeter d) Ohmmeter
Answer- b
a) aids the applied voltage
b) opposes the applied voltage
c) increases the armature current
d) decreases armature current
Answer- b
74. Which motor has this feature?
a) series motor
b) shunt motor
c) cumulative compound motor
d) Differential compound motor
Answer- c
75. Why is the field winding of DC series motor wound with thick wire?
a) To regulate the field voltage b) To carry the load current
c) To keep maximum inductance d) To reduce armature reaction
Answer- b
76. Which type of DC motor is suitable for shearing machines?
a) shunt motor b) series motor
c) cumulative compound motor d) differential compound motor
Answer- c
77. Where are DC compound motors preferred?
a) constant load requirements b) constant speed requirements
c) High starting torque requirements d) Variable speed to suit varying load requirements
Answer- d
78. What type of instrument is used to test armature winding?
a) Megger b) Growler c) Multimeter d) Ohmmeter
Answer- b
79. What is the need of starter for DC motor?
a) limit the field current
b) limit the field voltage
c) control the speed of the motor
d) limit the armature current
Answer- d
80. Why is the holding coil of a 3 point starter connected in series with the shunt field?
a) To limit the load current b) To run the motor at low voltage
c) To hold the plunger properly d) To protect the motor from high speed
Answer- d
81. What is the purpose of NVC connected in series with the field in a 3 point starter?
a) To improve torque b) Reduce the field current
c) To reduce back emf d) To prevent increase in speed
Answer- d
82. Which speed control method is used in food mixer motors?
a) Voltage control method b) Field diverter control method
c) Armature diverter method d) Series field tapping method
Answer- d
83. What is the purpose of tape in winding?
a) insulate the slots b) tie the coil
c) Wrap the conductors d) Insulate the exposed conductors
Answer- c
84. What is this action in the rewinding process?
a) cleaning the slots b) removing the winding
c) Removing wedges d) Cutting the winding wire
Answer- c
a) limit the field current
b) limit the field voltage
c) control the speed of the motor
d) limit the armature current
Answer- d
80. Why is the holding coil of a 3 point starter connected in series with the shunt field?
a) To limit the load current b) To run the motor at low voltage
c) To hold the plunger properly d) To protect the motor from high speed
Answer- d
81. What is the purpose of NVC connected in series with the field in a 3 point starter?
a) To improve torque b) Reduce the field current
c) To reduce back emf d) To prevent increase in speed
Answer- d
82. Which speed control method is used in food mixer motors?
a) Voltage control method b) Field diverter control method
c) Armature diverter method d) Series field tapping method
Answer- d
83. What is the purpose of tape in winding?
a) insulate the slots b) tie the coil
c) Wrap the conductors d) Insulate the exposed conductors
Answer- c
84. What is this action in the rewinding process?
a) cleaning the slots b) removing the winding
c) Removing wedges d) Cutting the winding wire
Answer- c
85. Which insulating material used in windings is highly non-hygroscopic (non-moisture absorbing)
and has good electrical strength?
a) Empire Cloth
b) Triplex paper
c) Millinex paper
d) Leather paper
Answer- c
86. What type of armature winding is illustrated?
a) Triplex wave winding
b) Duplex wave winding
c) progressive lap winding
d) Retrogressive lap winding
Answer- c
87. Why should newly rewound armature be heated before varnishing?
a) draw out moisture from it
b) helps in quick drying of varnish
c) make it easier for the varnish to penetrate
d) Maintain uniform spread of varnish
Answer- a
88. How is the direction of rotation of a DC compound motor changed?
a) changing the direction of armature current
b) interchanging the supply terminals
c) by changing the direction of both field and armature
d) by changing the direction of series field current
Answer- a
89. What is the effect on a DC shunt motor if its supply terminals are interchanged?
a) moves slowly b) moves fast
c) moves in the same direction d) moves in the opposite direction
Answer- c
and has good electrical strength?
a) Empire Cloth
b) Triplex paper
c) Millinex paper
d) Leather paper
Answer- c
86. What type of armature winding is illustrated?
a) Triplex wave winding
b) Duplex wave winding
c) progressive lap winding
d) Retrogressive lap winding
Answer- c
87. Why should newly rewound armature be heated before varnishing?
a) draw out moisture from it
b) helps in quick drying of varnish
c) make it easier for the varnish to penetrate
d) Maintain uniform spread of varnish
Answer- a
88. How is the direction of rotation of a DC compound motor changed?
a) changing the direction of armature current
b) interchanging the supply terminals
c) by changing the direction of both field and armature
d) by changing the direction of series field current
Answer- a
89. What is the effect on a DC shunt motor if its supply terminals are interchanged?
a) moves slowly b) moves fast
c) moves in the same direction d) moves in the opposite direction
Answer- c
90. If the field winding of a DC shunt motor is in open circuit, what is the speed?
a) it will stop running
b) the motor runs normally
c) moves slowly
d) moves at a very fast speed
Answer- d
91. What is the fuse rate for running a 10 HP three phase induction motor at full load?
a) 10A
b) 15A
c) 25A
d) 30 A
Ans. c
92. What is the type of AC motor stator winding?
a) Single layer basket winding b) Double layer basket winding
c) Complex coil winding d) Diamond coil winding
Answer- a
93. In which operations is the control circuit used?
a) remote control b) inching c) sequential control d) forward and reverse
Answer- b
94. What is the name of AC coil winding?
a) Half coil winding b) Whole coil winding
c) Single layer winding d) Double layer winding
Answer- b
a) it will stop running
b) the motor runs normally
c) moves slowly
d) moves at a very fast speed
Answer- d
91. What is the fuse rate for running a 10 HP three phase induction motor at full load?
a) 10A
b) 15A
c) 25A
d) 30 A
Ans. c
92. What is the type of AC motor stator winding?
a) Single layer basket winding b) Double layer basket winding
c) Complex coil winding d) Diamond coil winding
Answer- a
93. In which operations is the control circuit used?
a) remote control b) inching c) sequential control d) forward and reverse
Answer- b
94. What is the name of AC coil winding?
a) Half coil winding b) Whole coil winding
c) Single layer winding d) Double layer winding
Answer- b
95. What is the name of the starter symbol?
a) DOL starter
b) Auto transformer starter
c) Automatic star/delta starter
d) Semi automatic star/delta starter
Answer- b
96. What is the name of the starter symbol?
a) star delta starter
b) Rheostatic starter
c) Direct Online Starter
d) Auto transformer starter
Answer- a
97. What is the formula to calculate pitch factor?
a)
b)
c)
d)
Ans.b
98. What is the formula to calculate the average circumference of a coil?
a)
b)
c)
d)
Ans.b
a) DOL starter
b) Auto transformer starter
c) Automatic star/delta starter
d) Semi automatic star/delta starter
Answer- b
96. What is the name of the starter symbol?
a) star delta starter
b) Rheostatic starter
c) Direct Online Starter
d) Auto transformer starter
Answer- a
97. What is the formula to calculate pitch factor?
a)
b)
c)
d)
Ans.b
98. What is the formula to calculate the average circumference of a coil?
a)
b)
c)
d)
Ans.b
99. What is the synchronous speed of a 6 pole AC 3 phase induction motor at a frequency of 50
Hertz ,
a) 800 rpm
b) 1000 rpm
c) 1200 rpm
d) 1440 rpm
Ans.b
100. Calculate the slip percentage in a 3 phase induction motor having 6 poles with frequency of
50 hertz rotating at actual speed of 960 rpm ?
a) 2%
b) 3%
c) 4%
d) 5%
Ans. c
101. What is the rotor frequency of a 3 phase squirrel cage induction motor?
a) equal to the frequency of supply
b) supply is 3 times less than recurring
c) 3 times more than recurring supply
d) many times less than the supply frequency
Answer- a
102. Which loss of 3 phase induction motor is determined by blocked rotor test?
a) Copper deficiency
b) friction loss
c) hysteresis loss
d) Eddy current loss
Answer- a
103. Why pre heating is necessary for motor before varnishing in rewinding process?
a) To dry the varnish in the winding quickly
b) for easy flow of varnish into the winding
c) To increase the insulation resistance value
d) To remove moisture from between the winding layers
Answer- d
104. Which type of test is done using internal growler in AC motor winding?
a) Ground test b) Polarity test
c) Continuity test d) Short circuit test
Answer- d
Hertz ,
a) 800 rpm
b) 1000 rpm
c) 1200 rpm
d) 1440 rpm
Ans.b
100. Calculate the slip percentage in a 3 phase induction motor having 6 poles with frequency of
50 hertz rotating at actual speed of 960 rpm ?
a) 2%
b) 3%
c) 4%
d) 5%
Ans. c
101. What is the rotor frequency of a 3 phase squirrel cage induction motor?
a) equal to the frequency of supply
b) supply is 3 times less than recurring
c) 3 times more than recurring supply
d) many times less than the supply frequency
Answer- a
102. Which loss of 3 phase induction motor is determined by blocked rotor test?
a) Copper deficiency
b) friction loss
c) hysteresis loss
d) Eddy current loss
Answer- a
103. Why pre heating is necessary for motor before varnishing in rewinding process?
a) To dry the varnish in the winding quickly
b) for easy flow of varnish into the winding
c) To increase the insulation resistance value
d) To remove moisture from between the winding layers
Answer- d
104. Which type of test is done using internal growler in AC motor winding?
a) Ground test b) Polarity test
c) Continuity test d) Short circuit test
Answer- d
105. Which instrument is used to test starter winding short and open fault ?
a) Tong tester
b) Internal growler
c) External Growler
d) Digital Multimeter
Answer- b
106. Which type of motor is used to provide high starting torque at changing speed?
a) universal motor
b) permanent capacitor motor
c) 3 phase slip ring induction motor
d) 3 phase single squirrel cage induction motor
Answer- c
107. What is the relation between torque and slip in an AC induction motor?
a) torque decreases as slip increases
b) torque increases as slip increases
c) torque increases as slip decreases
d) torque decreases due to decrease in slip
Answer- b
108. Which type of wire is used for rewinding AC 3 phase motors?
a) Super enamelled copper wire
b) PVC covered copper winding wire
c) Single cotton covered wire
d) Double cotton covered copper wire
Answer- a
109. Which material is used as wedges in the winding process?
a) Empire
b) cotton
c) Bamboo
d) Terylene
Answer- c
110. Which test is necessary in windings before giving supply?
a) Ground test b) Polarity test
c) Open circuit test d) Short circuit test
Answer- b
a) Tong tester
b) Internal growler
c) External Growler
d) Digital Multimeter
Answer- b
106. Which type of motor is used to provide high starting torque at changing speed?
a) universal motor
b) permanent capacitor motor
c) 3 phase slip ring induction motor
d) 3 phase single squirrel cage induction motor
Answer- c
107. What is the relation between torque and slip in an AC induction motor?
a) torque decreases as slip increases
b) torque increases as slip increases
c) torque increases as slip decreases
d) torque decreases due to decrease in slip
Answer- b
108. Which type of wire is used for rewinding AC 3 phase motors?
a) Super enamelled copper wire
b) PVC covered copper winding wire
c) Single cotton covered wire
d) Double cotton covered copper wire
Answer- a
109. Which material is used as wedges in the winding process?
a) Empire
b) cotton
c) Bamboo
d) Terylene
Answer- c
110. Which test is necessary in windings before giving supply?
a) Ground test b) Polarity test
c) Open circuit test d) Short circuit test
Answer- b
111. Which loss is determined by no load test of a 3 phase induction motor?
a) Iron loss
b) Copper loss
c) friction loss
d) air loss
Answer- a
112. Which method of controlling speed in a 3 phase motor gives only two variable speeds?
a) rotor rheostat control
b) by changing the superimposed frequency
c) by changing the applied voltage
d) by changing the number of stator poles
Answer- d
113. Why is slip ring induction motor fitted with wound rotor?
a) Reducing slip
b) To control the speed
c) To minimise the loss
d) for higher starting and running torque
Answer- d
114. What is the function of timer in automatic star delta starter?
a) trip on overload
b) Start at preset time
c) Convert from star to delta
d) Switch off at preset time
Answer- c
115. Which instrument is used to measure the insulation resistance of a 3 phase induction motor?
a) Megger
b) Multimeter
c) Shunt type ohmmeter
d) series type ohmmeter
Answer- a
116. What is the starting current of an AC 3 phase induction motor?
a) 1 to 2 times the full load current b) 2 to 3 times the full load current
c) 4 to 5 times the full load current d) 5 to 6 times the full load current
Answer- d
a) Iron loss
b) Copper loss
c) friction loss
d) air loss
Answer- a
112. Which method of controlling speed in a 3 phase motor gives only two variable speeds?
a) rotor rheostat control
b) by changing the superimposed frequency
c) by changing the applied voltage
d) by changing the number of stator poles
Answer- d
113. Why is slip ring induction motor fitted with wound rotor?
a) Reducing slip
b) To control the speed
c) To minimise the loss
d) for higher starting and running torque
Answer- d
114. What is the function of timer in automatic star delta starter?
a) trip on overload
b) Start at preset time
c) Convert from star to delta
d) Switch off at preset time
Answer- c
115. Which instrument is used to measure the insulation resistance of a 3 phase induction motor?
a) Megger
b) Multimeter
c) Shunt type ohmmeter
d) series type ohmmeter
Answer- a
116. What is the starting current of an AC 3 phase induction motor?
a) 1 to 2 times the full load current b) 2 to 3 times the full load current
c) 4 to 5 times the full load current d) 5 to 6 times the full load current
Answer- d
117. Which method is used to control the speed of a 3 phase induction motor from the stator side?
a) By cascade operation
b) by rotor rheostat control
c) by injecting emf into the rotor circuit
d) by changing the superimposed frequency
Answer- d
118. What are the two functional circuits involved with a 3 phase motor starter?
a) open circuit and short circuit
b) closed circuit and open circuit
c) short circuit and closed circuit
d) control circuit and power circuit
Answer- d
119. Which is the main property of leatheroid paper insulation?
a) Non moisturised material
b) Highly non-hygroscopic
c) Very good for class F insulation
d) Better ageing and dielectric strength
Answer- d
120. Which insulation is used for cuffing in AC windings?
a) Fibre glass tape
b) Leather paper
c) Empire Fiberglass Tape
d) Cloth based adhesive tape
Answer- d
121. What is the coil called in AC winding?
a) number of turns connected in series
b) number of turns connected in parallel
c) number of turns under two similar poles
d) number of turns under two unlike poles
Answer- a
122. Which type of winding has more than one number of coils/poles/phases at different pitches?
a) Precision coil winding b) Diamond coil winding
c) Flat loop over lapped winding d) Flat loop non-over lapped winding
Answer- d
a) By cascade operation
b) by rotor rheostat control
c) by injecting emf into the rotor circuit
d) by changing the superimposed frequency
Answer- d
118. What are the two functional circuits involved with a 3 phase motor starter?
a) open circuit and short circuit
b) closed circuit and open circuit
c) short circuit and closed circuit
d) control circuit and power circuit
Answer- d
119. Which is the main property of leatheroid paper insulation?
a) Non moisturised material
b) Highly non-hygroscopic
c) Very good for class F insulation
d) Better ageing and dielectric strength
Answer- d
120. Which insulation is used for cuffing in AC windings?
a) Fibre glass tape
b) Leather paper
c) Empire Fiberglass Tape
d) Cloth based adhesive tape
Answer- d
121. What is the coil called in AC winding?
a) number of turns connected in series
b) number of turns connected in parallel
c) number of turns under two similar poles
d) number of turns under two unlike poles
Answer- a
122. Which type of winding has more than one number of coils/poles/phases at different pitches?
a) Precision coil winding b) Diamond coil winding
c) Flat loop over lapped winding d) Flat loop non-over lapped winding
Answer- d
123. Calculate number of coils/phases/poles for 3 phase double layer distributed winding for a
motor having 36 slots, 36 coils and 4 poles?
a) 3 coil/phase/pole
b) 6 coil/phase/pole
c) 9 coil/phase/pole
d) 12 coil/phase/pole
Answer- a
124. What is the type of rewinding process?
a) Hand wrapping
b) skin winding
c) former winding
d) Machine winding
Answer- a
125. Which type of starter is used for starting and running a 3 phase slip ring induction motor?
a) Direct online starter b) Rotor rheostat starter
c) Auto transformer starter d) Manual star-delta starter
Answer- b
126. What is the function of the collar?
a) Provides insulation around the field
b) Provides insulation for coil taping
c) helps to tighten the material for protruding edges
d) provides insulation for heat transfer from the coil
Answer- a
motor having 36 slots, 36 coils and 4 poles?
a) 3 coil/phase/pole
b) 6 coil/phase/pole
c) 9 coil/phase/pole
d) 12 coil/phase/pole
Answer- a
124. What is the type of rewinding process?
a) Hand wrapping
b) skin winding
c) former winding
d) Machine winding
Answer- a
125. Which type of starter is used for starting and running a 3 phase slip ring induction motor?
a) Direct online starter b) Rotor rheostat starter
c) Auto transformer starter d) Manual star-delta starter
Answer- b
126. What is the function of the collar?
a) Provides insulation around the field
b) Provides insulation for coil taping
c) helps to tighten the material for protruding edges
d) provides insulation for heat transfer from the coil
Answer- a
RRB ALP CBT 2 Electrician Technician Most Repeated Question
1.Resistance of a material always decreases if
A.Temperature of material is decreased
B.Temperature of material is increased
C. Number of free electrons available become more
D. None of these
Answer-C
2. If the efficiency of a machine is to be high, what should be low?
A. Ratio of output to input
B. Losses
C.True component of power
D. kWh
Answer-B
3.When electric current passes through a metallic conductor, its temperature rises. This is due to
A.collisions between conduction electrons and atoms
B.the release of conduction electrons from parent atoms
C.mutual collisions between metal atoms
D.mutual collisions between conducting electrons
Answer-A
4.Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
A.234 : 25
B.2425 : 4
C.25 2 : 5
D.265 : 2
Answer-C
5. A glass rod when rubbed with silk cloth is charged because
A. it takes in proton
B. its atoms are removed4
C.it gives away electrons
D.it gives away positive charge
Answer-C
6. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the
current.
A.Reactor
B.Capacitor
C.Inductor
D.Resistor
Answer-D
1.Resistance of a material always decreases if
A.Temperature of material is decreased
B.Temperature of material is increased
C. Number of free electrons available become more
D. None of these
Answer-C
2. If the efficiency of a machine is to be high, what should be low?
A. Ratio of output to input
B. Losses
C.True component of power
D. kWh
Answer-B
3.When electric current passes through a metallic conductor, its temperature rises. This is due to
A.collisions between conduction electrons and atoms
B.the release of conduction electrons from parent atoms
C.mutual collisions between metal atoms
D.mutual collisions between conducting electrons
Answer-A
4.Two bulbs of 500 W and 200 W rated at 250 V will have resistance ratio as
A.234 : 25
B.2425 : 4
C.25 2 : 5
D.265 : 2
Answer-C
5. A glass rod when rubbed with silk cloth is charged because
A. it takes in proton
B. its atoms are removed4
C.it gives away electrons
D.it gives away positive charge
Answer-C
6. Whether circuit may be AC. or D.C. one, following is most effective in reducing the magnitude of the
current.
A.Reactor
B.Capacitor
C.Inductor
D.Resistor
Answer-D
7. It becomes more difficult to remove
A. any electron from the
B. first electron from the orbit
C. second electron from the orbit
D. third electron from the orbit
Answer-D
8. When one leg of parallel circuit is opened out the total current will
A.reduce5
B. increase
C. decrease
D. become zero
Answer-C
9.In a lamp load when more than one lamp are switched on the total resistance of the load
A.increases
B.decreases
C.remains same
D. none of these
Answer-B
10.Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following
statement is correct?
A.100 W lamp will brighter
B.40 W lamp will glow brighter
C. Both lamps will glow equally bright
D.40 W lamp will fuse
Answer-B
11. Resistance of 220 V, 100 W lamp will be6
A.4.84 Ohm
B.48.4 Ohm
C.484 Ohm
D.4840 Ohm
Answer-B
12. In the case of direct current
A.magnitude and direction of current remains constant
B.magnitude and direction of current changes with time
C.magnitude of current changes with time
D.magnitude of current remains constant
Answer-A
A. any electron from the
B. first electron from the orbit
C. second electron from the orbit
D. third electron from the orbit
Answer-D
8. When one leg of parallel circuit is opened out the total current will
A.reduce5
B. increase
C. decrease
D. become zero
Answer-C
9.In a lamp load when more than one lamp are switched on the total resistance of the load
A.increases
B.decreases
C.remains same
D. none of these
Answer-B
10.Two lamps 100 W and 40 W are connected in series across 230 V (alternating). Which of the following
statement is correct?
A.100 W lamp will brighter
B.40 W lamp will glow brighter
C. Both lamps will glow equally bright
D.40 W lamp will fuse
Answer-B
11. Resistance of 220 V, 100 W lamp will be6
A.4.84 Ohm
B.48.4 Ohm
C.484 Ohm
D.4840 Ohm
Answer-B
12. In the case of direct current
A.magnitude and direction of current remains constant
B.magnitude and direction of current changes with time
C.magnitude of current changes with time
D.magnitude of current remains constant
Answer-A
13. When electric current passes through a bucket full of water, lot of bubbling is observed. This suggests
that the type of supply is
A. A.C.
B. D.C.
C. any of above two
D. none of the above
Answer-B7
14.Resistance of carbon filament lamp as the applied voltage increases.
A.increases
B.decreases
C.remains same
D.none of these
Answer-B
15.Bulbs in street lighting are all connected in
A.parallel
B.series
C.series-parallel
D.end to end
Answer-A
16.For testing appliances, the wattage of test lamp should be
A.very low
B.low
C.high
D.any value
Answer-C
17. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
A.arcs across separating contacts
B.mechanical noise of high intensity
C.both mechanical noise and arc between contacts
D.none of the above
Answer-B
18. Sparking occurs when a load is switched off because the circuit has high
A.resistance
B.inductance
C.capacitance
D.impedance
Answer-B
that the type of supply is
A. A.C.
B. D.C.
C. any of above two
D. none of the above
Answer-B7
14.Resistance of carbon filament lamp as the applied voltage increases.
A.increases
B.decreases
C.remains same
D.none of these
Answer-B
15.Bulbs in street lighting are all connected in
A.parallel
B.series
C.series-parallel
D.end to end
Answer-A
16.For testing appliances, the wattage of test lamp should be
A.very low
B.low
C.high
D.any value
Answer-C
17. Switching of a lamp in house produces noise in the radio. This is because switching operation produces
A.arcs across separating contacts
B.mechanical noise of high intensity
C.both mechanical noise and arc between contacts
D.none of the above
Answer-B
18. Sparking occurs when a load is switched off because the circuit has high
A.resistance
B.inductance
C.capacitance
D.impedance
Answer-B
RRB ALP Technician (Electrician) 23-01-2019 Shift -1
1. Binary 110110101 is equal to decimal –
a) 477
b) 349
c) 437
d) 333
Ans. c
2.The resistance of a metal rod depends on all of the following except –
a) Density
b) Resistivity
c) Temperature
d) Length
Ans. a
3.Which of the following is NOT a base unit?
a) Radian
b) Mole
c) Ampere
d) Candela
Ans. a
4.The sum of two binary numbers 1101111 and 11001101 is –
Ans. 11010100
5.In a certain gear train, the driver has 18 teeth while the follower has 8 teeth. For every 16 turns of the
driver, the follower turns –
Ans. 36
6. If 36 J of work is done in moving a charge across 8 V, find Q (in coulombs).
Ans. 4.5
7. 210 mm x 297 mm are the dimensions of _____ size paper.
Ans. A4
8. Farad per meter is the unit of –
a) Permeability
b) Electric conductance
c) Permittivity
d) Watt per steradian
Ans.
9. 100
0
Celcius = ______ Fahrenheit
Ans. -148
0
1. Binary 110110101 is equal to decimal –
a) 477
b) 349
c) 437
d) 333
Ans. c
2.The resistance of a metal rod depends on all of the following except –
a) Density
b) Resistivity
c) Temperature
d) Length
Ans. a
3.Which of the following is NOT a base unit?
a) Radian
b) Mole
c) Ampere
d) Candela
Ans. a
4.The sum of two binary numbers 1101111 and 11001101 is –
Ans. 11010100
5.In a certain gear train, the driver has 18 teeth while the follower has 8 teeth. For every 16 turns of the
driver, the follower turns –
Ans. 36
6. If 36 J of work is done in moving a charge across 8 V, find Q (in coulombs).
Ans. 4.5
7. 210 mm x 297 mm are the dimensions of _____ size paper.
Ans. A4
8. Farad per meter is the unit of –
a) Permeability
b) Electric conductance
c) Permittivity
d) Watt per steradian
Ans.
9. 100
0
Celcius = ______ Fahrenheit
Ans. -148
0
10. An Auto transformer is a/an:
a) Variable input voltage transformer
b) Automobile transformer
c) Automatic transformer
d) Variable output voltage transformer
Ans. d
11. What is the full form of MPCB?
Ans. Motor Protection Circuit Board
12. An element which stores energy in the form of magnetic field is:
a) Tungsten resistor
b) Eureka capacitor
c) Carbon inductor
d) Nichrome varistor
Ans. c
13. Most of power in India is generated by:
a) Hydro power plants
b) Wind power plants
c) Thermal power plants
d) Nuclear power plants
Ans. c
14. Which of the following is not true of a 3-phase induction motor?
a) Star delta starting is required
b) It is self-starting and running windings a required
c) It is self-starting and running windings a required
d) It has an auto transformer starter
Ans. c
15. The motor used in water pump is
a) Servo motor
b) DC motor
c) Synchronous motor
d) Induction motor
Ans. d
16. Inter pole winding is connected in series with which one of the following?
a) Field windings
b) Yoke
c) Pole winding
d) Armature winding
Ans. d
a) Variable input voltage transformer
b) Automobile transformer
c) Automatic transformer
d) Variable output voltage transformer
Ans. d
11. What is the full form of MPCB?
Ans. Motor Protection Circuit Board
12. An element which stores energy in the form of magnetic field is:
a) Tungsten resistor
b) Eureka capacitor
c) Carbon inductor
d) Nichrome varistor
Ans. c
13. Most of power in India is generated by:
a) Hydro power plants
b) Wind power plants
c) Thermal power plants
d) Nuclear power plants
Ans. c
14. Which of the following is not true of a 3-phase induction motor?
a) Star delta starting is required
b) It is self-starting and running windings a required
c) It is self-starting and running windings a required
d) It has an auto transformer starter
Ans. c
15. The motor used in water pump is
a) Servo motor
b) DC motor
c) Synchronous motor
d) Induction motor
Ans. d
16. Inter pole winding is connected in series with which one of the following?
a) Field windings
b) Yoke
c) Pole winding
d) Armature winding
Ans. d
17. The dielectric strength of transformer oil per mm is expected to be.
a) 100 kV
b) 30 kV
c) 330 kV
d) 1 kV
Ans. b
18. The concept of back emf in DC motor is based on.
a) Kirchoff’s current law
b) Faraday’s law
c) Lenz’s law
d) Ohm’s law
Ans. c
19. The starting capacitor used in single phase motor is
a) Electrolytic capacitor
b) Timer capacitor
c) Mica capacitor
d) Ceramic capacitor
Ans. a
20. What is the full form of UPS?
Ans. Uninterruptible Power supply
21. The range of temperature for soldering is
a) 180
0
C to 250
0
C
b) 100
0
C to 150
0
C
c) 1000
0
C to 2000
0
C
d) 600
0
C to 900
0
C
Ans. a
22. What will be the body resistance value of a person with normal age and health?
a) 0.5 kilo Ω
b) 1 kilo Ω
c) 5 kilo Ω
d) 10 kilo Ω
Ans. b
23. The working of SMPS is based on.
a) Frequency control principle
b) Integral control principle
c) Chopper principle
d) Phase control principle
Ans. c
a) 100 kV
b) 30 kV
c) 330 kV
d) 1 kV
Ans. b
18. The concept of back emf in DC motor is based on.
a) Kirchoff’s current law
b) Faraday’s law
c) Lenz’s law
d) Ohm’s law
Ans. c
19. The starting capacitor used in single phase motor is
a) Electrolytic capacitor
b) Timer capacitor
c) Mica capacitor
d) Ceramic capacitor
Ans. a
20. What is the full form of UPS?
Ans. Uninterruptible Power supply
21. The range of temperature for soldering is
a) 180
0
C to 250
0
C
b) 100
0
C to 150
0
C
c) 1000
0
C to 2000
0
C
d) 600
0
C to 900
0
C
Ans. a
22. What will be the body resistance value of a person with normal age and health?
a) 0.5 kilo Ω
b) 1 kilo Ω
c) 5 kilo Ω
d) 10 kilo Ω
Ans. b
23. The working of SMPS is based on.
a) Frequency control principle
b) Integral control principle
c) Chopper principle
d) Phase control principle
Ans. c
RRB ALP (Assistant Loco Pilot) Technician (Electrician) 23-01-2019 shift-II
1. Henry per meter is the unit of ____
a) Permeability
b) Electric conductance
c) Watt per steradian
d) Permittivity
Ans. a
2. Paracetamol is found in first aid boxes. When/why should these drugs be taken?
a) To ease mild pain and reduce high temperature (fever)
b) To ease the symptoms of ha fever and other allergies
c) To bring relief from asthma
d) To ease indigestion and heartburn
Ans. a
3. The _____ across the ends of a resistor is directly proportional to the current through it, provided its
temperature remains the same
a) Potential difference
b) Charge
c) Resistance
d) Resistivity
Ans. a
4. Which of the following is NOT a derived unit?
a) Mol
b) Volt
c) Radian
d) Lumen
Ans. a
5. In an electric iron, the transfer of heat form coil to base plate is mainly through.
a) Radiation
b) Capacitance
c) Convection
d) Conduction
Ans. d
6. In an electric iron, the transfer of heat from coil to base plate is mainly through.
a) Radiation
b) Capacitance
c) Convection
d) Conduction
Ans. d
1. Henry per meter is the unit of ____
a) Permeability
b) Electric conductance
c) Watt per steradian
d) Permittivity
Ans. a
2. Paracetamol is found in first aid boxes. When/why should these drugs be taken?
a) To ease mild pain and reduce high temperature (fever)
b) To ease the symptoms of ha fever and other allergies
c) To bring relief from asthma
d) To ease indigestion and heartburn
Ans. a
3. The _____ across the ends of a resistor is directly proportional to the current through it, provided its
temperature remains the same
a) Potential difference
b) Charge
c) Resistance
d) Resistivity
Ans. a
4. Which of the following is NOT a derived unit?
a) Mol
b) Volt
c) Radian
d) Lumen
Ans. a
5. In an electric iron, the transfer of heat form coil to base plate is mainly through.
a) Radiation
b) Capacitance
c) Convection
d) Conduction
Ans. d
6. In an electric iron, the transfer of heat from coil to base plate is mainly through.
a) Radiation
b) Capacitance
c) Convection
d) Conduction
Ans. d
7. The recommended configuration for soldering is
a) But joint
b) Scarf joint
c) Wave joint
d) Lap joint
Ans. d
8. In which of the following type of transformer the secondary winding is always kept closed?
a) Current transformer
b) Power transformer
c) Potential transformer
d) Distribution transformer
Ans. a
9. In a series lamp circuit each bulb is rated for 2 V. Calculate the number of bulbs to be connected in series
to run on a 110 V AC line.
Ans. 55
10. What type of conduit pipe is used in industrial wiring?
a) PVC conduit pipe
b) SS conduit pipe
c) MS Pipe
d) Galvanized rigid conduit pipe
Ans. d
11. If apparent power is found equal to active power, then the system power factor is
a) 1.2
b) 0.9
c) 0.8
d) 1
Ans. d
12. For a three-phase both balanced and unbalanced power measurement, what is the minimum number
of watt meters?
a) 4 b) 3 c) 2 d) 1
Ans. c
13. Working Principle of a transformer is based on-
a) Radio frequency
b) Mutual electromagnetic induction
c) Eddy currents
d) Photo radiation
Ans. b
a) But joint
b) Scarf joint
c) Wave joint
d) Lap joint
Ans. d
8. In which of the following type of transformer the secondary winding is always kept closed?
a) Current transformer
b) Power transformer
c) Potential transformer
d) Distribution transformer
Ans. a
9. In a series lamp circuit each bulb is rated for 2 V. Calculate the number of bulbs to be connected in series
to run on a 110 V AC line.
Ans. 55
10. What type of conduit pipe is used in industrial wiring?
a) PVC conduit pipe
b) SS conduit pipe
c) MS Pipe
d) Galvanized rigid conduit pipe
Ans. d
11. If apparent power is found equal to active power, then the system power factor is
a) 1.2
b) 0.9
c) 0.8
d) 1
Ans. d
12. For a three-phase both balanced and unbalanced power measurement, what is the minimum number
of watt meters?
a) 4 b) 3 c) 2 d) 1
Ans. c
13. Working Principle of a transformer is based on-
a) Radio frequency
b) Mutual electromagnetic induction
c) Eddy currents
d) Photo radiation
Ans. b
14. Which type of rotor consists of a cylindrical laminated core with parallel slots for carrying rotor
conductors?
a) Squirrel cage rotor
b) BLDC rotor
c) PMMC rotor
d) DC rotor
Ans. a
15. The greatest eddy current loss occurs in ______ part of the DC machine
a) Field poles
b) Commutating
c) Armature
d) Yoke
Ans. c
16. Inter-sheaths in the cables are used for –
a) Proper stress distribution
b) Protecting cables from moisture
c) Minimize stress
d) Improving insulation of cables
Ans. a
17. If voltage is measures across an AC mains open switch, the meter will read.
a) 0 V
b) 110 V
c) 230 V
d) 10 V
Ans. c
18. In a B-H curve, H represents –
a) Magnetic flux density
b) Magnetic field strength
c) Magnetic flux
d) Reluctance
Ans. b
19. The temperature controlling of an electric iron is done using –
a) Resistance temperature detector b) Thermocouple
c) Thermistor d) Bi-mettalic strip
Ans. d
20. Which of the following is not rechargeable dry cell?
a) Lithium-ion b) Alkaline c) Nickel cadmium d) Nickel-metal hydride
Ans. b
conductors?
a) Squirrel cage rotor
b) BLDC rotor
c) PMMC rotor
d) DC rotor
Ans. a
15. The greatest eddy current loss occurs in ______ part of the DC machine
a) Field poles
b) Commutating
c) Armature
d) Yoke
Ans. c
16. Inter-sheaths in the cables are used for –
a) Proper stress distribution
b) Protecting cables from moisture
c) Minimize stress
d) Improving insulation of cables
Ans. a
17. If voltage is measures across an AC mains open switch, the meter will read.
a) 0 V
b) 110 V
c) 230 V
d) 10 V
Ans. c
18. In a B-H curve, H represents –
a) Magnetic flux density
b) Magnetic field strength
c) Magnetic flux
d) Reluctance
Ans. b
19. The temperature controlling of an electric iron is done using –
a) Resistance temperature detector b) Thermocouple
c) Thermistor d) Bi-mettalic strip
Ans. d
20. Which of the following is not rechargeable dry cell?
a) Lithium-ion b) Alkaline c) Nickel cadmium d) Nickel-metal hydride
Ans. b
21. A 60 micro ampere meter has a resistance of 100 ohms. If the meter has to measure 100 mA, then the
value of current through the shunt is
Ans. 99.9 mA
22. Temperature control in bridge measurement is require because difference in temperature will cause a
difference in.
a) Resistance
b) Capacitance
c) Frequency
d) Inductance
Ans. a
23. Steel poles are painted to prevent them from which:
a) Corrosion
b) Grounding
c) Termites
d) Borer
Ans. a
24. What is the purpose of a lightning arrester connected between the line and earthing in a power sytem?
a) Protects the transmission line against lightning stroke
b) The terminal equipment is protected against travelling surges
c) High frequency oscillations are suppressed in the line
d) Reflects the travelling wave approaching it
Ans. B
Electrician MCQ Book in Just Rs.19/- (1000 Most Important Questions)
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value of current through the shunt is
Ans. 99.9 mA
22. Temperature control in bridge measurement is require because difference in temperature will cause a
difference in.
a) Resistance
b) Capacitance
c) Frequency
d) Inductance
Ans. a
23. Steel poles are painted to prevent them from which:
a) Corrosion
b) Grounding
c) Termites
d) Borer
Ans. a
24. What is the purpose of a lightning arrester connected between the line and earthing in a power sytem?
a) Protects the transmission line against lightning stroke
b) The terminal equipment is protected against travelling surges
c) High frequency oscillations are suppressed in the line
d) Reflects the travelling wave approaching it
Ans. B
Electrician MCQ Book in Just Rs.19/- (1000 Most Important Questions)
ITI Engineering Drawing Best MCQ Book in Just Rs.12/- [500 Question]
HEETSON
Telegram https://t.me/Heetson_Official
WhatsApp Channel
@heetsoniti
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