Switchgear Protections MCQ Questions & Answers

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Each section contains 100 MCQs on Switchgear Protections .

An isolator is installed

A) to operate the relay of circuit breaker B) as a substitute for circuit breaker C) always independent of the position of circuit breaker D) generally on both sides of a circuit breaker

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

Circuit breakers usually operate under

A) transient state of short-circuit current B) sub-transient state of short-circuit current C) steady state of short-circuit current D) after D. C. component has ceased

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

Overheating of relay contacts or contact born out is due to

A) slow making and breaking of load circuit contacts B) foreign matter on the contact surface C) too low contact pressure D) all of the above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

To reduce short circuit fault currents are used.

A) reactors B) resistors C) capacitors D) none of the above

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

H.R.C. fuses provide best protection against

A) overload B) reverse current C) open-circuits D) short-circuits

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

D.C. shunt relays are made of

A) few turns of thin wire B) few turns of thick wire C) many turns of thin wire D) many turns of thick wire

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

________ relay is preferred for phase fault on short transmission line.

A) Induction type B) Reactance C) Impedance D) None of the above

Discuss

Answer & Solution

Answer: Option B

No explanation is given for this question. Let's Discuss on Board

For the protection of power station buildings against direct strokes the requirements are

A) interception B) interception and conduction C) interception, conduction and dissipation D) interception, conduction, dissipation and reflection E) none of the above

Discuss

Answer & Solution

Answer: Option C

No explanation is given for this question. Let's Discuss on Board

The main function of a fuse is to

A) protect the line B) open the circuit C) protect the appliance D) prevent excessive currents E) none of the above

Discuss

Answer & Solution

Answer: Option D

No explanation is given for this question. Let's Discuss on Board

100

The information to the circuit breaker under fault conditions is provided by

A) relay B) rewirable fuse C) H.R.'only D) all of the above

Discuss

Answer & Solution

Answer: Option A

No explanation is given for this question. Let's Discuss on Board

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Switchgear Protections MCQ Questions & Answers | Electrical Engineering