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The information to the circuit breaker under fault conditions is provided by

relay
rewirable fuse
H.R.'only
All of these

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The current rating of a fuse is 5A. The fusing current will be

2.5 A
1 A
5 A
more than 5A

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Which of the following circuit breakers is prefered for EHT applications ?

low oil circuit breaker
bulk oil circuit breaker
Sf6 CB
air break circuit breaker

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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 A
1500/√3 A
750 A
None of these

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

200 A
100 A
300 A
more than 1000 A

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For the same power, the least size is of

oil circuit breaker
vaccum circuit breaker
air-blast circuit breaker
sf6 circuit breaker

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