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The relay operating coil is supplied through

current transformer
fuse
None of these
power transformer

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Directional relay are based on flow of

power
voltage wave
All of these
current

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Insulation resistance of high voltage circuit breakers is more than

1 mega ohms
100 mega ohms
500 mega ohms
10 mega ohms

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The making capacity of a circuit breaker is equal to

√2 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity

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The arcing contacts in a circuit breaker are made of

aluminium alloy
porcelain
copper tungsten alloy
electrolytic copper

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

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

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