Switchgear Protections MCQ Questions & Answers

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Each section contains 100 MCQs on Switchgear Protections .

Short-circuit currents are due to

A) single phase to ground faults B) phase to phase faults C) two phase to ground faults D) three phase faults E) any of these

Discuss

Answer & Solution

Answer: Option E

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

Resistance grounding is used for voltage between

A) 33kV to 66kV B) 22kV to 33kV C) 3.3kV and 11kV D) none of the above

Discuss

Answer & Solution

Answer: Option C

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

Discrimination between main and back up protection is provided by the use of relays which are

A) fact B) sensitive C) slow D) none of the above

Discuss

Answer & Solution

Answer: Option C

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

Thermal overload relays are used to protect the motor against over current due to

A) short-circuits B) heavy loads C) grounds D) all of the above

Discuss

Answer & Solution

Answer: Option B

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

When a transmission line is energized, the wave that propagates on it is

A) current wave only B) voltage wave only C) both (A) and (B) D) power factor wave only

Discuss

Answer & Solution

Answer: Option C

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

Overload relays are of type.

A) induction B) solid state C) thermal D) electromagnetic E) all above

Discuss

Answer & Solution

Answer: Option E

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

H.R.C. fuse, as compared to a rewirable fuse, has

A) no ageing effect B) high speed of operation C) high rupturing capacity D) all of the above

Discuss

Answer & Solution

Answer: Option D

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

The inverse definite mean time relays are used for over current and earth fault protection of transformer against

A) heavy loads B) internal short-circuits C) external short-circuits D) all of the above

Discuss

Answer & Solution

Answer: Option B

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

Which of the following devices will receive voltage surge first travelling on the transmission line ?

A) Lightning arresters B) Relays C) Step-down transformer D) Switchgear

Discuss

Answer & Solution

Answer: Option A

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

The relay with inverse time characteristic will operate within

A) 1.5 sec B) 5 to 10 sec C) 5 to 20 sec D) 20 to 30 sec E) none of the above

Discuss

Answer & Solution

Answer: Option B

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

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Switchgear Protections MCQ Questions & Answers | Electrical Engineering