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To reduce short circuit fault currents......... are used.

reactors
resistors
capacitors
None of these

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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

6
8
2
4

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A differential relay measures the vector difference between

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

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When transmission line is energized, the wave that propagates on it is

current wave only
both current wave and voltage wave
power factor wave only
voltage wave only

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Relay can be designed to respond to changes in

temperature
resistance, reactance and impedance
All of these
voltage and current

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The information to the circuit breaker under fault conditions is provided by

H.R.'only
rewirable fuse
relay
All of these

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