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Switchgear Protections - Interview Questions and Answers

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36. 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
Explanation:
37. Wave trap is used to trap waves of
A. power frequencies
B. higher frequencies entering genera�tor or transformer units
C. either of the above
D. none of the above
Explanation:
38. Interruption of large currents by relay requires
A. arc suppressing blow out coils
B. wide separation of the opened contacts
C. high speed opening of contacts
D. all of the above
Explanation:
39. The reflection co-efficient at the open circuited end of a transmission line.
A. zero
B. infinity
C. unity
D. none of the above
Explanation:
40. Which of the following is the least expensive protection for overcurrent is low voltage system ?
A. Rewireable fuse
B. Isolator
C. Oil circuit breaker
D. Air break circuit breaker
Explanation:
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