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protection of fuses is generally not used beyond

200 A
50 A
100 A
20 A

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A fuse is never inserted in

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

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The single phasing relays are used for the protection of

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

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Series capacitors are used to

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

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

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

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