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The arc voltage produced in AC circuit breaker is always
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
None of these
Answer
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The voltage appearing across the contacts after opening of the circuit breaker is called
recovery voltage
operating voltage
surge voltage
arc voltage
recovery voltage
operating voltage
surge voltage
arc voltage
Answer
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Current chopping mainly occurs in
oil circuit breaker
vaccum circuit breaker
sf 6 circuit breaker
air-blast circuit breaker
oil circuit breaker
vaccum circuit breaker
sf 6 circuit breaker
air-blast circuit breaker
Answer
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Minimum arcing voltage will be least in case of
silver
carbon
tungsten
graphite
silver
carbon
tungsten
graphite
Answer
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An isolator is designed to open a circuit under
None of these
no load
full load
normal conditions
None of these
no load
full load
normal conditions
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The operating time of a circuit breaker is
0.05 sec
0.002 sec
0.2 sec
0.001 sec
0.05 sec
0.002 sec
0.2 sec
0.001 sec
Answer
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