Switchgear Protections MCQ Questions & Answers

1

Magnetic circuit breaker has ______ trip action.

A) delayed B) instantaneous C) both of the above D) none of the above

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Answer & Solution

Answer: Option B

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2

In a circuit breaker the basic problem is to

A) maintain the arc B) extinguish the arc C) transmit large power D) emit the ionizing electrons

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Answer & Solution

Answer: Option B

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3

The arcing contacts in a circuit breaker are made of

A) copper tungsten alloy B) porcelain C) electrolytic copper D) aluminium alloy

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Answer & Solution

Answer: Option A

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4

Air blast circuit breaker is used for

A) over currents B) short duty C) intermittant duty D) repeated duty

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Answer & Solution

Answer: Option D

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5

The steady state stability of the power system can be increased by

A) Connecting lines in parallel B) Connecting lines in series C) Using machines of high impedance D) Reducing the excitation of machines

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Answer & Solution

Answer: Option A

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6

The inductive interference between power and communication line can be minimized by

A) transposition of the power line B) transposition of the communication line C) both (A) and (B) D) increasing the distance between the conductors

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Answer & Solution

Answer: Option C

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7

A thermal protection switch can protect against

A) short-circuit B) temperature C) overload D) over voltage

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Answer & Solution

Answer: Option C

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8

Thermal circuit breaker has

A) delayed trip action B) instantaneous trip action C) both of the above D) none of the above

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Answer & Solution

Answer: Option A

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9

The time of closing the cycle, in modern circuit breakers is

A) 0.003 sec B) 0.001 sec C) 0.01 sec D) 0.10 sec E) none of the above

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Answer & Solution

Answer: Option A

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10

Transmission line has reflection coefficient as one.

A) Open circuit B) Short-circuit C) Long D) None of the above

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Answer & Solution

Answer: Option A

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Switchgear Protections MCQ Questions & Answers | Electrical Engineering