Switchgear Protections MCQs Preparation for Electrical Engineering - Set 09 - ObjectiveBooks
Switchgear Protections MCQs Preparation for Electrical Engineering - Set 09

Switchgear Protections MCQs Preparation for Electrical Engineering - Set 09

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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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