Switchgear Protections MCQ Questions & Answers

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Each section contains 100 MCQs on Switchgear Protections .

Arc in a circuit behaves as

A) a capackive reactance B) an inductive reactance C) a resistance increasing with voltage rise across the arc D) a resistance decreasing with voltage rise across the arc

Discuss

Answer & Solution

Answer: Option D

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

A fuse is connected

A) in series with circuit B) in parallel with circuit C) either in series or in parallel with circuit D) none of the above

Discuss

Answer & Solution

Answer: Option A

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

The reflection co-efficient at the open circuited end of a transmission line.

A) zero B) infinity C) unity D) none of the above

Discuss

Answer & Solution

Answer: Option C

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

Protection by fuses is generally not used beyond

A) 20 A B) 50 A C) 100 A D) 200 A

Discuss

Answer & Solution

Answer: Option C

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

The ground wire should not be smaller than No ______ copper.

A) 2 B) 4 C) 6 D) 10

Discuss

Answer & Solution

Answer: Option D

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

Directional relays are based on flow of

A) power B) current C) voltage wave D) all of the above

Discuss

Answer & Solution

Answer: Option A

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

Admittance relay is _______ relay.

A) impedance B) directional C) non-directional D) none of the above

Discuss

Answer & Solution

Answer: Option B

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

The voltage appearing across the contacts after opening of the circuit breaker is called______voltage.

A) recovery B) surge C) operating D) arc E) none of the above

Discuss

Answer & Solution

Answer: Option A

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

The material used for fuse must have

A) low melting point and high specific resistance B) low melting point and -low specific resistance C) high melting point and low specific resistance D) low melting point and any specific resistance

Discuss

Answer & Solution

Answer: Option B

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

For cost and safety, the outdoor substations are installed for voltages above

A) 11 kV B) 33 kV C) 60 kV D) 110 kV

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