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The operating time of a circuit breaker is

0.001 sec
0.05 sec
0.2 sec
0.002 sec

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The short circuit in any winding of the transformer is the result of

insulation failure
impulse voltage
loose connection
mechanical vibration

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Current chopping mainly occurs in

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

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The time-current graph of a fuse

None of these
is a circle
has inverse characteristic
has a linear characteristic

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A circuit breaker must perform the duty of

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

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Distance relays are generally

impedance relays
none of these
reactance relays
split-phase relays

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