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Wave trap is used to trap waves of
power frequencies
None of these
higher frequencies entering generator or transformer units
either of the above
power frequencies
None of these
higher frequencies entering generator or transformer units
either of the above
Answer
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Resistance grounding is used for voltage between
11 kv to 33 kv
None of these
33 kV to 66 kV
3.3 kV to 11 kv
11 kv to 33 kv
None of these
33 kV to 66 kV
3.3 kV to 11 kv
Answer
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The fusing factor is
always less than 1
always 1
None of these
always more than 1
always less than 1
always 1
None of these
always more than 1
Answer
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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as
lead time
lag time
clearing time
operation time
lead time
lag time
clearing time
operation time
Answer
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Circuit breakers usually operate under
steady state of short circuit current
after dc component has ceased
sub-transient state of short circuit current
transient state of short circuit current
steady state of short circuit current
after dc component has ceased
sub-transient state of short circuit current
transient state of short circuit current
Answer
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For the same power, the least size is of
oil circuit breaker
sf6 circuit breaker
air-blast circuit breaker
vaccum circuit breaker
oil circuit breaker
sf6 circuit breaker
air-blast circuit breaker
vaccum circuit breaker
Answer
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