RRB ALP CBT 2 Instrument mechanic Question Paper MCQ (Railway Assistant Loco Pilot)

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2. RRB ALP CBT 2 Instrument Mechanic Question
Paper MCQ (Railway Assistant Loco Pilot)
Contents
RRB ALP CBT 2 Instrument Mechanic 23/01/2019 Shift 1 ................................................................................................ 2

RRB ALP CBT 2 Instrument Mechanic 23/01/2019 Shift 1
1. Binary 110110101 is equal to decimal _____
Ans. 437

2. The sum of two binary numbers 1101111 and 1100101 is____
Ans. 11010100

3. Farad Per meter is the unit of ____
a) Permeability
b) Electric conductance
c) Permittivity
d) Watt per steradian
Ans. a

4. The root of the thread is ____
a) small diameter of screw thread
b) Between the part of peak point and root of the thread
c) Bottom part of the thread
d) Large diameter of screw thread
Ans. c

5. Swaging of copper tube is done for joining ____
a) A tube of the same diameter as the copper tube
b) the stud
c) pinching tool
d) a dissimilar diameter tube
Ans. a

6. Which of the following device is obtained from joining base to collector and collector to base of NPN and
PNP transistor?
a) SCR b) TRIAC
c) UJT d) DIAC
Ans. A

3. 7. The cast iron water pipe is manufactured with the help of _____
a) Flange coupling
b) Welding
c) Brazing
d) Socket
Ans. a

8. Why does copper tube need to be straightened?
a) For reduce the fluid pressure
b) For prevent from corrosion
c) For increase the fluid pressure
d) For looks good to external surface
Ans. c

9. Which of the following is a standard line measuring instrument?
a) Micrometer
b) End bar
c) Slip gauge
d) Measuring tape
Ans. d

10. How many types of Phase sequence indicators are there?
a) 2
b) 5
c) 1
d) 10
Ans. a

11. How many number of p-n junction in crystal diode?
a) Four p-n junction
b) Two p-n junction
c) Three p-n junction
d) One p-n junction
Ans. d

12. What is the full form of SVGA?
Ans. Super Video Graphics Array

13. In 8085 microprocessor time required for instruction fetching and executing, the instruction known as
a) Machine cycle
b) Instruction cycle
c) Clock cycle
d) Memory cycle
Ans. b

4. 14. How can the air quality condition of a place be improved?
a) By adding air
b) By filtration of air
c) By using a de-humidifier
d) By adding moisture to the air
Ans. b

15. In hard copper tube, shining is provided to _______
a) Red hot condition of tube
b) Hard instrument for shining
c) Copper tube by temperature
d) Using special chemical
Ans. c

16. Ratchet of outside micrometer is used to _____
a) Lock the spindle
b) Lock the frame
c) Lock the hub
d) Indicate the correct measurement achieved
Ans. a

17. Which material is used for negative pole of dry cell?
a) Zinc
b) Aluminum
c) Silicon
d) Lead
Ans. a

18. Generator transformers are ____ transformers.
a) Step-up b) Step-down c) One-one d) Auto
Ans. a

19. Digital voltmeter (DVM) can be used to measure _____
a) Voltage and pressure b) Resistance c) Force d) Current
Ans. a

20. In fundamental units, which is common from MKS and FPS? That is …….
a) Pound b) Kilogram c) Second d) Foot
Ans. c

21. Socket is used for _____
a) To bend the pipe in any direction b) To joint the two same pipes
c) To joint the two different pipes d) To kept the pipe in one direction
Ans. b

5. 22. What should be the RH range for comfort air zone?
a) 10%-20%
b) 20%-30%
c) 50%-60%
d) 30%-40%
Ans. c

23. Where is the field magnetic coil provide in DC generator?
a) In rotor
b) At shaft
c) At back cover
d) In body
Ans. d

24. How is the moisture content of ‘condition space’ improved?
a) By removing dry air
b) By adding moisture
c) By isolating unit
d) By adding dry air
Ans. b

25. If we wants to divert a main line into two direction, then which of these has to be used?
a) T
b) Bend
c) Elbow
d) Union
Ans. a

26. In any energymeter the supply voltage is –
a) Zero
b) Depend on load
c) Always constant
d) Can be fluctuate
Ans. c

27. Which measuring instrument is used to measure the potential difference between two point?
a) Voltmeter b) Ohmmeter c) Energy meter d) Ammeter
Ans. a

28. If Kinc developed during pipe bending, then what should happen?
a) Problem during joint b) Fluid pressure drop increased
c) Effect on finishing d) Fluid pressure drop reduced
Ans. d

6. 29. Which of the following is the unit of length?
a) Light year
b) Moon month
c) Kelvin
d) Candela
Ans. a

30. The receiver tank will help remove water from the system by giving ____
a) the air a chance to become hot
b) the air a chance to become moisture
c) the air a chance to convert into vapour
d) the air a chance to become cool
Ans. d

31. The AC power of output signal is obtained by ____ of amplifier.
a) Input DC voltage
b) AC biasing voltage
c) DC biasing voltage
d) Input AC voltage
Ans. c

32. Which is based on law of conversion of energy?
a) Ohm’s law
b) Faraday’s law
c) Flemings law
d) Kirchoff’s law
Ans. d

33. The output of NAND gate is low if ____
a) Any input of gate is high
b) any input of gate is low
c) all inputs are low
d) all inputs are high
Ans. d

34. The EMF value of Dry cell is approximately
a) 2.0 V b) 1.5 V c) 2.5 V d) 0.5 V
Ans. b

35. Bourdon tube can be used to measure pressure upto ______
a) 5 MN/m
2
b) 8 MN/m
2

c) 3 MN/m
2
d) 10 MN/m
2

Ans. c

7. 36. What is the difference of DC voltage in the adjoining brush.
a) 12 V
b) 0 V
c) 15 V
d) 10 V
Ans. b

37. Which hand tool is used to remove the stain to get high degree of accuracy.
a) Chisel
b) Hacksaw
c) File
d) Scraper
Ans. c

38. If the input frequency of half wave rectifier is 50Hz, then output frequency will be _____
Ans. 50Hz

39. Crystal oscillators are best suitable for the use in _____
a) timing elements
b) movement elements
c) temperature elements
d) speed elements
Ans. a

40. Zener diode is used as a _____
a) Multivibrator
b) Voltage regulator
c) Rectifier
d) Amplifier
Ans. b

41. The resistivity of wire is depend on ______ mainly.
a) Material
b) Diameter of wire
c) Length of wire
d) Number of wire
Ans. a

42. For the measurement of resistance, meter consists of ____
a) Low current source
b) High current source
c) Low voltage source
d) Medium voltage source
Ans. a

8. 43. Which of the following winding is necessary in equalizer ring during armature condition?
a) Wave winding
b) Lap winding
c) Delta winding
d) Duplex winding
Ans. b

44. What is the meaning of m8x1.25
a) 1.25 mm pitch master thread
b) 1.25 mm pitch matrix thread
c) 1.245 mm Malaysia thread
d) 1.25 mm Pitch modern thread
Ans. b

45. Which instrument is used to represent the pressure level?
a) Diaphram sensor
b) Manometer
c) Bourdon
d) Resonance
Ans. b

46. In a PNP transistor, the base is of _____ material.
a) X
b) P
c) Y
d) N
Ans. d

47. What is the effect of moisture in refrigeration cycle?
a) Compressor will be closed
b) Thermostate will be closed
c) Fan will be closed
d) Capillary can be choked
Ans. d

48. Which of the following is used as circuit breaker?
a) Resistor
b) Switch
c) Fuse
d) Resettable protective device
Ans. c

49. If power is 100 watt and resistance is 4 ohm then current (I) will be?
Ans. 5A

9. 50. Transformer utilization factor of a half wave rectifier is equal to _____
a) 0.256
b) 0.297
c) 0.267
d) 0.287
Ans. d

51. Armature winding is fixed on _____
a) Base of the wood
b) Stator
c) Platform
d) Rotor
Ans. d

52. Which method is employed to connect batteries?
a) Direct
b) Parallel
c) Series
d) B and C
Ans. d

53. In a balanced 3 phase circuit, neural current is alays ____
a) 10 A
b) 0A
c) 12 A
d) 15 A
Ans. b

54. _____ cannot measure using CRO device?
a) Voltage ripple
b) Resistance
c) Current
d) Voltage
Ans. b

55. Stable Oscillator output has constant _____
a) Current b) Voltage and resistance
c) Amplitude and frequency d) Temperature and movement
Ans. c

56. Which type of pencil dryer is absorb the moisture?
a) Dryer with metal mesh b) Dryer coating Alumina
c) Dryer with silica gel d) Dryer with molecular sieve
Ans. d

10. 57. What is measured from multimeter?
a) force
b) Temperature
c) Current
d) Pressure
Ans. c

58. Which of the following is not present in energy source?
a) Multimeter
b) Generator
c) Battery
d) Rheostat
Ans. d

59. Shaft coupling is a device, which is used for ____
a) To connect two shaft together
b) To change the direction of shaft
c) To connect three shaft together
d) To change the direction of revolution
Ans. a

60. Which of the of the following is not a type of pressure sensing element?
a) Bourdon tube
b) Bellows
c) Orifice plate
d) Diaphragm
Ans. c

61. What is the unit of electrical charge?
a) Voltage
b) Ampere-Hour
c) Watts-Hour
d) Ohm-Hour
Ans. b

62. 450V bulb passes 0.4A current, then find the power in bulb.
a) 1125W b) 900W
c) 180W d) 425W
Ans. c

63. What is the recommended temperature range of copper tube?
a) -29
0
C to 425
0
C b) -225
0
C to 550
0
C
c) -80
0
C to 335
0
C d) -40
0
C to 205
0
C
Ans. b

11. 64. Voltage magnification is also known as
a) Voltage factor
b) Current factor
c) Quality factor
d) Consume factor
Ans. c

65. How many strain gauges are needed to measure deformation?
a) One
b) Two
c) Four
d) Three
Ans. c

66. Tunnel diode operates in ______ frequency field very fastly.
a) Ultraviolet
b) Gamma
c) Wi-Fi
d) Microwave
Ans. d

67. Vacuum thermo elements types of instruments are mostly employed the measurement o electric
current at ____
a) Very low frequency
b) Normal frequency
c) very high frequency
d) medium frequency
Ans. c

68. An amplifier which has zero input signal is called ____
a) minimum signal condition
b) zero signal condition
c) signal condition
d) maximum signal condition
Ans. b

69. What is the probe required for Power Quality Analyser for three phase supply?
a) 1 Current, 2 voltage
b) 2 current, 1 voltage
c) 2 current, 2 voltage
d) 3 current, 3 voltage
Ans. c

12. 70. The SI unit of inductances is
a) amperes
b) henry
c) Ohms
d) volt
Ans. b

71. What is the atmospheric pressure at sea level?
a) 23psi
b) 18.75psi
c) 21.70psi
d) 14.70psi
Ans. d

72. Megger is a instrument, which is used to measure_______
a) High resistance
b) Low resistance
c) Leakage current
d) Medium resistance
Ans. a

73. A dynamometer type wattmeter consists of ____
a) potential and current coil
b) electric coil
c) moving coil
d) no coils
Ans. a

74. Dynamometer type wattmeter responds to the ____
a) average value of the active power b) peak value of the reactive power
c) average value of the reactive power d) peak value of the active power
Ans. a

75. Because of which of the following harvesting conditions, equipments is too bad?
a) Cutting speed b) Depth of cutting c) Feed d) Constant use
Ans. a

76. How many control spring is given in power factor meter?
a) four b) one c) zero d) two
Ans. c

77. If the range of CRO is maximum 10V, then which of the following probe is use to measure 60V
a) 1X b) 30X c) 1000X d) 10X
Ans. D

13. 78. What will be the effect if a refrigeration cycle contains moisture?
a) Capillary may choke
b) Compressor will switch off
c) Fan will switch off
d) Thermostat will switch off
Ans. A

79. If one wants to divert from main line to a two-direction use, then which has to be used?
a) Bend
b) Union
c) Elbow
d) T
Ans. D













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RRB ALP CBT 2 Instrument Mechanic 23/01/2019 Shift 1