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The power loss is an important factor for the design of

feeder
transmission line
generator
motor

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A differential relay measures the vector difference between

two voltages
two currents
two or more similar electrical quantities
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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When transmission line is energized, the wave that propagates on it is

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

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Breaking capacity of a circuit breaker is usually expressed in terms of

Mw
MVA
volts
amperes

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A fuse is a

current controlling device
protective device
None of these
current limiting device

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