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The operating time of a circuit breaker is
0.002 sec
0.05 sec
0.2 sec
0.001 sec
0.002 sec
0.05 sec
0.2 sec
0.001 sec
Answer
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Related Question
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For interrupting of high voltage and low current, the circuit breaker prefered is
air-blast circuit breaker
oil circuit breaker
all are correct
vaccum circuit breaker
air-blast circuit breaker
oil circuit breaker
all are correct
vaccum circuit breaker
Answer
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________ relay is preferred for phase fault on short transmission line.
None of these
Impedance
Induction type
Reactance
None of these
Impedance
Induction type
Reactance
Answer
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Insulation resistance of high voltage circuit breakers is more than
10 mega ohms
500 mega ohms
100 mega ohms
1 mega ohms
10 mega ohms
500 mega ohms
100 mega ohms
1 mega ohms
Answer
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The making capacity of a circuit breaker is equal to
√2 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
None of these
√2 × symmetrical breaking capacity
√3 × symmetrical breaking capacity
2.55 × symmetrical breaking capacity
None of these
Answer
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A circuit breaker is rated as 1500 A, 1000 MVA, 33 kv, 3-second , 3- phase oil circuit breaker. The rated normal current is
1500/√3 A
750 A
1500 A
None of these
1500/√3 A
750 A
1500 A
None of these
Answer
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