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The relay operating coil is supplied through

None of these
fuse
current transformer
power transformer

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

0.01 sec
0.10 sec
0.003 sec
0.001 sec

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

more than 5A
2.5 A
5 A
1 A

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protection of fuses is generally not used beyond

20 A
100 A
50 A
200 A

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

reactors
None of these
resistors
capacitors

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Which of the following is the least expensive protection for over current is low voltage system ?

isolator
oil circuit breaker
air break circuit breaker
rewireable fuse

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