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Switchgear Protections - Interview Questions and Answers

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46. Which of the following parameter can be neglected for a short line ?
A. Inductance
B. Capacitance
C. Resistance
D. Reactance
Explanation:
47. Discrimination between main and back up protection is provided by the use of relays which are
A. fact
B. sensitive
C. slow
D. none of the above
Explanation:
48. The short circuit in any winding of the transformer is the result of
A. mechanical vibration
B. insulation failure
C. loose connection
D. impulse voltage
Explanation:
49. The relay with inverse time characteristic will operate within
A. 1.5 sec
B. 5 to 10 sec
C. 5 to 20 sec
D. 20 to 30 sec
Explanation:
50. Which of the following circuit breakers has high reliability and minimum maintenance ?
A. Air blast circuit breakers
B. Circuit breaker with SF6 gas
C. Vacuum circuit breakers
D. Oil circuit breakers
Explanation:
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