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The fusing factor is

always less than 1
always 1
always more than 1
None of these

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Back up protection is generally used for protection against

open-circuit faults only
both open and short-circuit faults
short-circuit faults only
None of these

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Arc in a circuit breaker is interrupted at

maximum current
minimum voltage
zero current
maximum voltage

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Dc shunt relays are made of

few turns of thick wire
many turns of thin wire
few turns of thin wire
many turns of thick wire

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Circuit breakers usually operate under

steady state of short circuit current
sub-transient state of short circuit current
after dc component has ceased
transient state of short circuit current

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The rated secondary current of current transformer for relays is generally

30 A
5 A
20 A
10 A

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