Switchgear and Protection MCQs Part 5
Contents
- 1 Which of the following device detects fault in power system
- 2 A circuit breaker is rated as 1800 A, 1000 MVA, 33 kV, 3 second, 3 phase oil circuit breaker. The value of rated normal current is
- 3 Fuse operation is based on
- 4 The rating of circuit breaker is usually determined on the basis of
- 5 The operating time of circuit breaker is around
Which of the following device detects fault in power system
Which of the following device detects fault in power system
- Relay
- Circuit breaker
- Isolator
- None of these
Correct answer: 1. Relay
A circuit breaker is rated as 1800 A, 1000 MVA, 33 kV, 3 second, 3 phase oil circuit breaker. The value of rated normal current is
A circuit breaker is rated as 1800 A, 1000 MVA, 33 kV, 3 second, 3 phase oil circuit breaker. The value of rated normal current is:
- 1000 A
- 1800 A
- 2500 A
- 3000 A
Correct answer: 2. 1800 A
Fuse operation is based on
Fuse operation is based on:
- Magnetic effect of current
- Heating effect of electric current
- Photo-electric effect
- None of these
Correct answer: 2. Heating effect of electric current
The rating of circuit breaker is usually determined on the basis of
The rating of circuit breaker is usually determined on the basis of:
- Single line to ground fault
- Double line to ground fault
- Line to line fault
- Symmetrical fault
Correct answer: 4. Symmetrical fault
The operating time of circuit breaker is around
The operating time of circuit breaker is around:
- 0.002 s
- 0.005 s
- 0.2 s
- 5 s
Correct answer: 3. 0.2 s