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protection of fuses is generally not used beyond

100 A
50 A
20 A
200 A

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A fuse is never inserted in

neutral wire
phase line
negative of dc circuit
positive of dc circuit

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The single phasing relays are used for the protection of

single phase motors only
two single phase motors running in parallel
two phase motors only
three phase motors

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Series capacitors are used to

compensate for line capacitive reactance
compensate for line inductive reactance
improve line voltage
None of these

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Air blast circuit breakers for 400 kV power system are designed to operate in

50 milli-second
0.1 sec
100 micro-second
0.5 sec

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