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In Railway applications ______ circuit breaker is used.

air break
minimum oil
bulk oil
SFe

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HRC fuses provide best protection against

open circuits
overload
short circuits
reverse current

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The fuse wire, in DC circuit, is inserted in

positive circuit only
Both positive and negative circuit
negative circuit only
None of these

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The reflection co-efficient at the open circuited end of a transmission line

unity
infinity
zero
None of these

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Dc shunt relays are made of

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

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A differential relay measures the vector difference between

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

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