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The information to the circuit breaker under fault conditions is provided by

All of these
H.R.'only
relay
rewirable fuse

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Wave trap is used to trap waves of

either of the above
power frequencies
None of these
higher frequencies entering generator or transformer units

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A fuse is a

current limiting device
None of these
current controlling device
protective device

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The operating time of a fuse is about

0.002 sec
1.5 sec
0.8 sec
1 sec

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protection of fuses is generally not used beyond

100 A
20 A
50 A
200 A

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The voltage appearing across the contacts after opening of the circuit breaker is called

recovery voltage
operating voltage
surge voltage
arc voltage

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