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Switchgear Protections - Interview Questions and Answers

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66. 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
Explanation:
67. A thermal protection switch can protect against
A. short-circuit
B. temperature
C. overload
D. over voltage
Explanation:
68. An isolator is installed
A. to operate the relay of circuit breaker
B. as a substitute for circuit breaker
C. always independent of the position of circuit breaker
D. generally on both sides of a circuit breaker
Explanation:
69. Admittance relay is _______ relay.
A. impedance
B. directional
C. non-directional
D. none of the above
Explanation:
70. On which of the following effects of electric current a fuse operates ?
A. Photoelectric effect
B. Electrostatic effect
C. Heating effect
D. Magnetic effect
Explanation:
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