Electrical Engineering MCQs on Power System Protection
Contents
The arc voltage formed in AC circuit breaker is always
The arc voltage formed in AC circuit breaker is always
- In phase with the arc current
- Lagging the arc current by 90°
- Leading the arc current by 90°
- None of these
Correct answer: 1. In phase with the arc current
Discrimination between main and back up protection is provided by using relays that are
Discrimination between main and back up protection is provided by using relays that are
- Fact
- Sensitive
- Slow
- None of these
Correct answer: 3. Slow
Bus coupler is very important in
Bus coupler is very important in
- Double bus, double breaker arrangement
- Main and transfer bus arrangement
- Single bus arrangement
- All of these
Correct answer: 2. Main and transfer bus arrangement
Fault diverters are essentially
Fault diverters are essentially
- Circuit breakers
- Fast switches
- Fuses
- Relays
Correct answer: 2. Fast switches
For cost and safety, the outdoor substations are installed for voltages beyond
For cost and safety, the outdoor substations are installed for voltages beyond
- 11 kV
- 110 kV
- 33 kV
- 60 kV
Correct answer: 3. 33 kV