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The making capacity of a circuit breaker is equal to
√2 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity
Answer
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Minimum arcing voltage will be least in case of
carbon
tungsten
silver
graphite
carbon
tungsten
silver
graphite
Answer
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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
6.25 A
12.5 A
25 A
3.125 A
6.25 A
12.5 A
25 A
3.125 A
Answer
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When transmission line is energized, the wave that propagates on it is
voltage wave only
power factor wave only
both current wave and voltage wave
current wave only
voltage wave only
power factor wave only
both current wave and voltage wave
current wave only
Answer
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Outdoor switchgear is generally used for voltage beyond
66 kV
33 kV
11 kV
132 kV
66 kV
33 kV
11 kV
132 kV
Answer
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Relay can be designed to respond to changes in
voltage and current
temperature
resistance, reactance and impedance
All of these
voltage and current
temperature
resistance, reactance and impedance
All of these
Answer
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