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Minimum arcing voltage will be least in case of

carbon
graphite
silver
tungsten

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

more than 1000 A
100 A
300 A
200 A

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A _______ is used to measure the stator % winding temperature of the generator.

pyrometer
thermometer
thermocouple
resistance thermometer

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

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

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The operating time of a fuse is about

0.8 sec
0.002 sec
1.5 sec
1 sec

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The fuse rating is expressed in terms of

VAR
voltage
current
kVA

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