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Minimum arcing voltage will be least in case of

carbon
graphite
silver
tungsten

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A.C. network analyzer is used to solve problems of

Load flow and stability
Load flow, short-circuit and stability
Load flow
Load flow and short-circuit

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The time of closing the cycle, in modern circuit breakers is

0.003 sec
0.01 sec
0.10 sec
0.001 sec

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

volts
Mw
amperes
MVA

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

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

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________ relay is preferred for phase fault on short transmission line.

Reactance
None of these
Impedance
Induction type

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