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To reduce short circuit fault currents......... are used.

reactors
capacitors
None of these
resistors

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The time-current graph of a fuse

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

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If the fault occurs near the impedance relay, the V/ I ratio will be

constant for all distances
higher than that of if fault occurs away from the relay
None of these
Lower than that of if fault occurs away from the relay

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Wave trap is used to trap waves of

power frequencies
higher frequencies entering generator or transformer units
None of these
either of the above

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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

operation time
lag time
clearing time
lead time

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A circuit breaker must perform the duty of

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

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