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For the same power, the least size is of
oil circuit breaker
air-blast circuit breaker
vaccum circuit breaker
sf6 circuit breaker
oil circuit breaker
air-blast circuit breaker
vaccum circuit breaker
sf6 circuit breaker
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The rated secondary current of current transformer for relays is generally
5 A
10 A
30 A
20 A
5 A
10 A
30 A
20 A
Answer
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Air blast circuit breakers for 400 kV power system are designed to operate in
100 micro-second
0.1 sec
0.5 sec
50 milli-second
100 micro-second
0.1 sec
0.5 sec
50 milli-second
Answer
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The transient voltage that appears across the contacts at the instant of arc extinction is called
peak voltage
supply voltage
restriking voltage
recovery voltage
peak voltage
supply voltage
restriking voltage
recovery voltage
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Which of the following CB's is generally used in railways applications ?
sf 6 circuit breaker
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
sf 6 circuit breaker
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
Answer
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The rating of a circuit breaker is generally determined on the basis of
single line to ground fault current
line to line fault current
symmetrical fault current
double line to ground fault current
single line to ground fault current
line to line fault current
symmetrical fault current
double line to ground fault current
Answer
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