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Distance relays are generally

split-phase relays
reactance relays
impedance relays
none of these

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Air blast circuit breaker is used for

short duty
intermittent duty
over currents
repeated duty

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The current rating of a fuse is 5A. The fusing current will be

5 A
1 A
2.5 A
more than 5A

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

0.003 sec
0.10 sec
0.01 sec
0.001 sec

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The device that detects the fault in a power system is

None of these
relay
circuit breaker
isolator

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The arcing contacts in a circuit breaker are made of

electrolytic copper
copper tungsten alloy
porcelain
aluminium alloy

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