Switchgear and Protection MCQs Part 13

Switchgear and Protection MCQs Part 13

The circuit breaker is best defined as a

The circuit breaker is best defined as a:

1. Current Control device
2. Current Limiting device
3. Circuit interruption device
4. None of these

Correct answer: 3. Circuit interruption device

Oil in low oil circuit breaker serves to

Oil in low oil circuit breaker serves to:

1. Provide arc extinction
2. Provide insulation
3. Both of above
4. None of above

Correct answer: 1. Provide arc extinction

Back-up protection is usually used for protection against

Back-up protection is usually used for protection against:

1. Open-circuit faults only
2. Short-circuit faults only
3. Both of these
4. None of these

Correct answer: 2. Short-circuit faults only

What of following is the most efficient torque-producing structure for induction-type relays

What of following is the most efficient torque-producing structure for induction-type relays:

1. Induction cup structure
2. Shaded-pole structure
3. Watthour-meter structure
4. None of these

Correct answer: 1. Induction cup structure

The contact resistance of circuit breaker is around

The contact resistance of circuit breaker is around:

1. 2 Ω
2. 20 µΩ
3. 200 µΩ
4. 1000 Ω

Correct answer: 2. 20 µΩ

See the complete list of Electrical Engineering MCQs on Power System Protection

Switchgear and Protection MCQs