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Air blast circuit breaker is used for

intermittent duty
over currents
repeated duty
short duty

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The relay operating coil is supplied through

None of these
fuse
current transformer
power transformer

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A differential relay measures the vector difference between

None of these
two currents
two or more similar electrical quantities
two voltages

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Distance relays are generally

reactance relays
none of these
split-phase relays
impedance relays

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The device that detects the fault in a power system is

circuit breaker
isolator
relay
None of these

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

lag time
clearing time
operation time
lead time

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