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Arc in a circuit breaker is interrupted at

zero current
minimum voltage
maximum current
maximum voltage

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Distance relays are generally

reactance relays
none of these
impedance relays
split-phase relays

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A fuse element is generally made of

iron
steel
brass
silver

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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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If the length of the arc in a circuit breaker increases, its resistance

None of these
decreases
remains same
increases

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The transient voltage that appears across the contacts at the instant of arc extinction is called

recovery voltage
supply voltage
peak voltage
restriking voltage

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