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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

2
8
4
6

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Directional relay are based on flow of

All of these
voltage wave
power
current

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Relay can be designed to respond to changes in

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

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The power loss is an important factor for the design of

motor
transmission line
feeder
generator

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The rating of a circuit breaker is generally determined on the basis of

symmetrical fault current
single line to ground fault current
double line to ground fault current
line to line fault current

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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
voltage wave only
power factor wave only

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