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Switchgear Protections - Interview Questions and Answers

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11. The current zero interruption, in oil and air blast circuit breakers, is achieved by
A. lengthening of the gap
B. cooling and blast effect
C. both (a) and (b)
D. deionizing the oil with forced air
Explanation:
12. Relays can be designed to respond to changes in
A. resistance, reactance or impedance
B. voltage and current
C. light intensity & temperature
D. all above
Explanation:
13. The relay operating speed depends upon
A. the spring tension
B. the rate of flux built up
C. armature core air gap
D. all of the above
Explanation:
14. Directional relays are based on flow of
A. power
B. current
C. voltage wave
D. all of the above
Explanation:
15. Arc in a circuit behaves as
A. a capackive reactance
B. an inductive reactance
C. a resistance increasing with voltage rise across the arc
D. a resistance decreasing with voltage rise across the arc
Explanation:
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