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The time of closing the cycle, in modern circuit breakers is

0.01 sec
0.001 sec
0.003 sec
0.10 sec

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A fuse performs

circuit interruption function only
detection function only
both detection and interruption functions
None of these

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Circuit breakers usually operate under

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

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Breaking capacity of a circuit breaker is usually expressed in terms of

volts
amperes
Mw
MVA

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In Railway applications ______ circuit breaker is used.

minimum oil
air break
SFe
bulk oil

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

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

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