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Switchgear Protections - Interview Questions and Answers

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6. Burden of a protective relay is the power
A. required to operate the circuit breaker
B. absorbed by the circuit of relay
C. developed by the relay circuit
D. none of the above
Explanation:
7. In order that current should flow without causing excessive heating or voltage drop, the relay contacts should
A. have low contact resistance
B. be clean and smooth
C. be of sufficient size and proper shape
D. have all above properties
Explanation:
8. Thermal circuit breaker has
A. delayed trip action
B. instantaneous trip action
C. both of the above
D. none of the above
Explanation:
9. Which of the following medium is employed for extinction of arc in air circuit breaker ?
A. Water
B. Oil
C. Air
D. SF6
Explanation:
10. Air blast circuit breaker is used for
A. over currents
B. short duty
C. intermittant duty
D. repeated duty
Explanation:
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