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Switchgear Protections - Interview Questions and Answers

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91. Oil switches are employed for
A. low currents circuits
B. low voltages circuits
C. high voltages and large currents circuits
D. all circuits
Explanation:
92. Protection by fuses is generally not used beyond
A. 20 A
B. 50 A
C. 100 A
D. 200 A
Explanation:
93. The fuse blows off by
A. burning
B. arcing
C. melting
D. none of the above
Explanation:
94. In a single bus-bar system there will be complete shut down when
A. fault occurs on the bus itself
B. fault occurs on neutral line
C. two or more faults occur simultaneously
D. fault occurs with respect to earthing
Explanation:
95. The information to the circuit breaker under fault conditions is provided by
A. relay
B. rewirable fuse
C. H.R.C. only
D. all of the above
Explanation:
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