Switchgear and Protection MCQs Part 13
Contents
The circuit breaker is best defined as a
The circuit breaker is best defined as a:
- Current Control device
- Current Limiting device
- Circuit interruption device
- 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:
- Provide arc extinction
- Provide insulation
- Both of above
- 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:
- Open-circuit faults only
- Short-circuit faults only
- Both of these
- 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:
- Induction cup structure
- Shaded-pole structure
- Watthour-meter structure
- 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:
- 2 Ω
- 20 µΩ
- 200 µΩ
- 1000 Ω
Correct answer: 2. 20 µΩ
See the complete list of Electrical Engineering MCQs on Power System Protection
Switchgear and Protection MCQs