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The fusing factor is

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

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A circuit breaker must perform the duty of

All of these
carrying fault current for a short time
being closed on to a fault
opening the faulty circuit and breaking the fault current

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

surge voltage
arc voltage
operating voltage
recovery voltage

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Outdoor switchgear is generally used for voltage beyond

11 kV
66 kV
33 kV
132 kV

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Dc shunt relays are made of

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

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Current chopping mainly occurs in

air-blast circuit breaker
oil circuit breaker
sf 6 circuit breaker
vaccum circuit breaker

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