Practice Test: Question Set - 09
1. For cost and safety, the outdoor substations are installed for voltages above
- (A) 11 kV
- (B) 33 kV
- (C) 60 kV
- (D) 110 kV
2. The contacts of high voltage switches used in power system are submerged in oil. The main purpose of the oil is to
- (A) Lubricate the contacts
- (B) Insulate the contacts from switch body
- (C) Extinguish the arc
- (D) All of the above
3. Circuit breakers are essentially
- (A) Current carrying contacts called electrodes
- (B) Arc extinguishers
- (C) Circuits to break the system
- (D) Transformers to isolate the two systems
4. Fault diverters are basically
- (A) Fuses
- (B) Relays
- (C) Fast switches
- (D) Circuit breakers
5. Insulation resistance of high voltage circuit breakers is more than
- (A) 1 mega ohms
- (B) 10 mega ohms
- (C) 100 mega ohms
- (D) 500 mega ohms
6. Which of the following circuit breakers has high reliability and minimum maintenance?
- (A) Air blast circuit breakers
- (B) Circuit breaker with SF6 gas
- (C) Vacuum circuit breakers
- (D) Oil circuit breakers
7. The fuse wire, in D.C. circuits, is inserted in
- (A) Negative circuit only
- (B) Positive circuit only
- (C) Both (A) and (B)
- (D) Either (A) or (B)
8. H.R.C. fuse, as compared to a rewirable fuse, has
- (A) No ageing effect
- (B) High speed of operation
- (C) High rupturing capacity
- (D) All of the above
9. Bus coupler is very essential in arrangement
- (A) Single bus
- (B) Double bus, double breaker
- (C) Main and transfer bus
- (D) All of the above
10. With which of the following, a circuit breaker must be equipped for remote operation?
- (A) Inverse time trip
- (B) Time-delay trip
- (C) Shunt trip
- (D) None of the above
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