Mcq unit ii

1. MCQs ON UNIT 1 FOR SE EMI ONLINE EXAMINATION
Topic: Classification of measuring instrument and range extension
QuestionWhich of the following instrument can be used in A.C. bridges for less frequencies up to
200 Hz only
A Head phone
B Tunable amplifier detector
C Vibration galvanometer
D All of the above
AnswerC
QuestionWhich of the following bridge is used in strain gauge measurement
A Kelvin bridge
B Specially design bridge
C Kelvin double bridge
D Carey-foster bridge
AnswerB
QuestionA Megger is basically a
A Moving iron type instrument
B Moving coil type instrument
C Hot wire instrument
D Electrolytic instrument
AnswerB
QuestionMaxwell inductance capacitance bridge is used for measurement of inductance of
A Low Q coils only
B Medium Q coils only
C High Q coils only
D Low and Medium Q coils only
AnswerB
Marks 2
Unit 1

2. Topic: Topic: Classification of measuring instrument and range extension
QuestionThe most commonly used null deflector in a power frequency ac bridge is a:
A Vibration galvanometer
B D'Arsanval galvanometer
C Ballistic galvanometer
D Tachometer
AnswerA
QuestionLoss of charge method is used to measure
A Low Resistance
B High Resistance
C Low Inductance
D High Inductance
AnswerB
QuestionMegger is an instrument used for the measurement of:
A High resistance and insulation resistance
B Medium resistance
C Low resistance
D Leakage current
AnswerA
QuestionAnderson bridge is used to measure of:
A Inductance
B Capacitance
C Time period
D Resistance and capacitance
AnswerA
Marks 2
Unit 1

3. Topic: Topic: Classification of measuring instrument and range extension
QuestionKelvin double bridge is best suited for the measurement of:
A Inductance
B Capacitance
C Low resistance
D High resistance
AnswerC
QuestionThe material used to make standard resistance is:
A Manganin
B Aluminum
C Nichrome
D Platinum
AnswerA
QuestionInductance is measured by which one of the following
A Wien bridge
B Schering bridge
C Maxwell bridge
D Owen bridge
AnswerC
QuestionIf a wheat stone bridge is in balance condition then
A A heavy current flows through the galvanometer
B No current flows through the galvanometer
C The current in each of the four arms R1, R2, R3 and R4 are same
D A low current flows through the galvanometer
AnswerB
Marks 2
Unit 1

4. Topic: Topic: Classification of measuring instrument and range extension
QuestionThe value of resistance of an earthing electrode depends upon
A Shape and material of electrode
B Depth to which electrode is driven into earth
C Specific resistance of soil
D All of the above
AnswerD
QuestionFrom the point of view of safety, the resistance of earthing electrode should be
A Low
B High
C Medium
D The value of resistance of earth electrode does not affect the safety
AnswerA
Question------------- is a instrument which measures the insulation resistance of an electrical circuit
relative to earth and one another
A Tangent galvanometer
B Megger
C Current transformer
D None of the above
AnswerB
QuestionThe controlling torque in a megger is provided by
A Springs
B Weights attached to the moving system
C It does not need any controlling torque
D None of the above
AnswerC
Marks 2
Unit 1

5. Topic: Topic: Classification of measuring instrument and range extension
QuestionThe operating voltage of a megger is about
A 6V
B 120V
C 400V
D 500V
AnswerD
QuestionThe electrical power to a megger is provided by
A Battery
B Permanent magnet DC generator
C A.C generator
D Any of the above
AnswerB
QuestionFor measuring a very high resistance we should use
A Kelvins double bridge
B Wheatstone bridge
C Megger
D None of the above
AnswerC
Marks 2
Unit 1

6. Topic: Topic: Classification of measuring instrument and range extension
QuestionA bride circuit works at a frequency of 2 kHz. The following can be used as detectors for
detection of null conditions in the bridge
A Vibration galvanometer and head phones
B Head phones and tunable amplifiers
C Vibration galvanometer and tunable amplifiers
D Vibration galvanometer, head phones and tunable amplifiers
AnswerB
QuestionA Wheatstone bridge cannot be used for precision measurement because errors are
introduced on account of
A Resistance of connecting leads
B Thermo-electric emfs
C Connecting resistances
D All of the above
AnswerD
QuestionWhich of the following methods will be suitable for the measurement of the resistance of
an ammeter shunt
A Wheatstone bridge
B Kelvin’s double bridge
C Maxwell bridge
D Wiens bridge
AnswerB
QuestionWhich of the following instrument can be used in ac bridges for less frequencies up to 200
Hz only
A Head phones
B Tunable amplifiers
C Vibration galvanometer
D All of the above

7. AnswerC
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionOhmmeter is
A A meter to record ohm
B Used to measure resistance
C Combination of ohm and meter
D An indicating instrument
AnswerB
QuestionIn a megger when not in operation, the pointer shows a resistance of
A 0 Ohm
B 100 Ohm
C 555 Ohm
D Infinity
AnswerD
QuestionA bridge is used for the measurement of capacitance is
A Wheatstone bridge
B Wiens bridge
C Maxwell bridge
D Schearing bridge
AnswerD
QuestionLow resistance from few ohms down to one micro ohm is measured using which one of the
following instruments
A Ohmmeter
B A series type ohmmeter
C A shunt type ohmmeter
D A voltmeter and ammeter

8. AnswerD
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionIn an Anderson bridge, the unknown inductance is measured in terms of
A Known inductance and resistance
B Known capacitance and resistance
C Known resistance
D Known inductance
AnswerB
QuestionFor measurement of mutual inductance we can use
A Anderson bridge
B Maxwell bridge
C Heaviside bridge
D Any of the above
AnswerC
QuestionFor measurement of inductance having high value, we should use
A Maxwell bridge
B Maxwell Wein bridge
C Hays bridge
D Any of the above
AnswerC
QuestionTo avoid the effect of stray magnetic field in a.c bridges we can use
A Magnetic screening
B Wagner earthing device
C Wave filters

9. D Any of the above
AnswerA
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionIf an inductance is connected in one arm of bridge and resistance in the remaining three
arms
A The bridge can always be balanced
B The bridge cannot be balanced
C The bridge can be balanced if the resistance have some specific values
D Any of the above
AnswerB
QuestionWagner’s Earth device are used in bridge circuit for
A Eliminating the effect of earth capacitance
B Eliminating the effect of-inter component capacitance
C Eliminating the effect of stray electrostatic fields
D Shielding the bridge elements
AnswerA
QuestionSwamping resistance is a resistance which is added to moving coil of a meter to
A Reduce full scale current
B Reduce the temperature error
C Increase the sensitivity
D Increase the field strength
AnswerB
QuestionKelvin double bridge is best suited for the measurement of
A Inductance
B Capacitance
C Low resistance
D High resistance

10. AnswerC
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionThe accuracy of Kelvin double bridge for the measurement of low resistance is high
because the bridge
A Uses two pairs of resistance arms
B Has medium value resistance in the ratio arms
C Uses a low resistance link between standard and test resistance
D Uses a null indicating galvanometer
AnswerC
QuestionWhich instruments has the lowest resistance
A Ammeter
B Voltmeter
C Frequency meter
D Megger
AnswerA
QuestionThe sensitivity of a Wheatstone bridge depends upon
A Galvanometer current sensitivity
B Galvanometer resistance
C Bridge supply voltage
D All of the above
AnswerD
QuestionHigh resistance are provided with a guard terminal in order to
A Protect the resistance against stray electrostatic field
B Bypass the leakage current
C Protect the resistance against overloads

11. D Protect the resistance against stray electromagnetic field
AnswerB
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionA high resistance cannot be measured by simple ammeter- voltmeter because
A Voltmeter rating will be too high
B Ammeter rating will be too low
C Leakage current cannot be neglected
D Power loss will be high
AnswerC
QuestionAll meters used for measuring current, voltage and resistance are basically
A Multimeters
B Voltmeters
C Ammeters
D Ohmmeters
AnswerB
QuestionMegger is essentially, a
A Megohmmeter
B Dynamometer
C Series type ohmmeter
D Shunt type ohmmeter
AnswerA
QuestionA megger is used for measurement of
A Voltage
B Flux

12. C Power
D Insulation resistance
AnswerD
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionThe resistance of a shunt for a precision grade ammeter can be best measured by
A De Sauty bridge
B Schering bridge
C Maxwell bridge
D Kelvin double bridge
AnswerD
QuestionThe resistance from 0.1 to 1.0 ohm can be measured easily with precision better than 0.5%
by
A Differential galvanometer
B Kelvin double bridge
C Potentiometer
D Wheatstone bridge
AnswerB
QuestionThe Wheatstone bridge method of resistance measurement is ideally suitable for the
measurement of resistance values in the range of
A 0.001 Ω to 1 Ω
B 0. 1 Ω to 100 Ω
C 100 Ω to 10 kΩ
D 100 kΩ to 10 MΩ
AnswerB
QuestionThe insulation resistance of a domestic wiring is to be measured. The instrument preferred
is
A Kelvin double bridge
B Ohm meter

13. C Potentiometer
D Megger
AnswerD
Marks 2
Unit 1
Topic: Topic: Classification of measuring instrument and range extension
QuestionThe maximum sensitivity of a Wheatstone bridge is achieved when the bridge
A Uses dc supply
B Uses ac supply
C Has unity arm ratio
D Has 1:2 arm ratio
AnswerC
QuestionInductance comparison bridge uses
A One L and one C
B One L
C One C
D None of the above
AnswerC
QuestionQuality factor Q depends upon
A wL/R
B 1/wRC
C Power stored/ Power lost
D Power dissipated/ Power stored
AnswerA
QuestionAnderson bridge is used for measurement of
A Time period
B Phase difference
C Inductance

14. D Capacitance
AnswerC
Marks 2
Unit 1