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switchgear and protection MCQs

Practise focused switchgear and protection questions with marked answers for exam preparation and subject revision.

switchgear and protection Mcqs

1. With which of the following, a circuit breaker must be equipped for remote operation ?
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A. None of the above

B. Shunt trip

C. Time-delay trip

D. All of the above

E. Inverse time trip

2. The single phasing relays are used for the protection of_____________?
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A. two single phase motors running in parallel

B. three phase motors

C. single phase motors only

D. two phase motors only

3. What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?
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A. Infinity

B. None of the above

C. Zero

D. Unity

4. Which of the following parameter can be neglected for a short line ?
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A. Resistance

B. Capacitance

C. Inductance

D. Reactance

5. A _________ is used to measure the stator % winding temperature of the generator?
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A. thermometer

B. thermocouple

C. resistance thermometer

D. pyrometer

6. On which of the following effects of electric current a fuse operates ?
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A. Heating effect

B. Electrostatic effect

C. Photoelectric effect

D. Magnetic effect

7. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should_________________?
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A. be of sufficient size and proper shape

B. be clean and smooth

C. have all above properties

D. have low contact resistance

8. When a transmission line is energized, the wave that propagates on it is____________?
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A. current wave only

B. voltage wave only

C. Both (A) and (B)

D. power factor wave only

9. The main function of a fuse is to_____________?
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A. none of the above

B. protect the line

C. prevent excessive currents

D. protect the appliance

E. open the circuit

10. An efficient and a well designed protective relaying should have_____________?
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A. high speed and selectivity

B. good selectivity and reliability

C. all of the above

D. economy and simplicity

11. Series capacitors are used to_________________?
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A. improve line voltage

B. none of the above

C. compensate for line inductive reactance

D. compensate for line capacitive reactance

12. The arcing contacts in a circuit breaker are made of______________?
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A. aluminium alloy

B. copper tungsten alloy

C. porcelain

D. electrolytic copper

13. The inverse definite mean time relays are used for over current and earth fault protection of transformer against_________________?
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A. heavy loads

B. internal short-circuits

C. all of the above

D. external short-circuits

14. Relays can be designed to respond to changes in________________?
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A. light intensity

B. all above

C. resistance, reactance or impedance

D. voltage and current

E. temperature

15. The fuse blows off by___________?
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A. burning

B. none of the above

C. arcing

D. melting

16. For the protection of power station buildings against direct strokes the requirements are___________?
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A. interception, conduction, dissipation and reflection

B. interception, conduction and dissipation

C. none of the above

D. interception

E. interception and conduction

17. Shunt capacitance is neglected while considering______________?
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A. short transmission line

B. long transmission line

C. medium transmission line

D. medium and long transmission lines

18. Admittance relay is __________ relay?
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A. impedance

B. directional

C. none of the above

D. non-directional

19. In a circuit breaker the basic problem is to________________?
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A. extinguish the arc

B. emit the ionizing electrons

C. transmit large power

D. maintain the arc

20. Air blast circuit breakers for 400 kV power system are designed to operate in_______________?
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A. 100 microsecond

B. 50 millisecond

C. 0.5 sec

D. 0.1 sec

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