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Breaking capacity of a circuit breaker is usually expressed in terms of

MVA
amperes
volts
Mw

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To reduce short circuit fault currents......... are used.

reactors
None of these
capacitors
resistors

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The current rating of a fuse is 5A. The fusing current will be

2.5 A
more than 5A
5 A
1 A

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For the same power, the least size is of

sf6 circuit breaker
air-blast circuit breaker
oil circuit breaker
vaccum circuit breaker

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The time of closing the cycle, in modern circuit breakers is

0.01 sec
0.10 sec
0.001 sec
0.003 sec

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

25 A
3.125 A
6.25 A
12.5 A

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