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Minimum arcing voltage will be least in case of

silver
tungsten
graphite
carbon

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Dc shunt relays are made of

few turns of thin wire
many turns of thin wire
few turns of thick wire
many turns of thick wire

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For the same power, the least size is of

vaccum circuit breaker
air-blast circuit breaker
sf6 circuit breaker
oil circuit breaker

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In a single bus-bar system there will be complete shut down when

fault occurs on the bus itself
fault occurs with respect to earthing
fault occurs on neutral line
two or more faults occur simultaneously

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An efficient and a well designed protective relaying should have

economy and simplicity
good selectivity and reliability
high speed and selectivity
All of these

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Which of the following CB's is generally used in railways applications ?

bulk oil circuit breaker
low oil circuit breaker
sf 6 circuit breaker
air break circuit breaker

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