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Switchgear Protections - Interview Questions and Answers

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16. Overload relays are of...... type.
A. induction
B. solid state
C. thermal & electromagnetic
D. all above
Explanation:
17. 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
Explanation:
18. H.R.C. fuses provide best protection against
A. overload
B. reverse current
C. open-circuits
D. short-circuits
Explanation:
19. Resistance grounding is used for voltage between
A. 33kVto66kV
B. HkVto33kV
C. 3.3kVandllkV
D. none of the above
Explanation:
20. 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
Explanation:
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