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

5 A
more than 5A
2.5 A
1 A

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The making capacity of a circuit breaker is equal to

√3 × symmetrical breaking capacity
None of these
2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity

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The fault that imposes severest duty on the circuit breaker is

line to line fault
two lines to ground fault
line to ground fault
all three lines short-circuited

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Which of the following is used in liquid fuses ?

distilled water
sulphur hexafluoride
carbon tetrachloride
transformer oil

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HRC fuses provide best protection against

open circuits
reverse current
short circuits
overload

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A circuit breaker must perform the duty of

opening the faulty circuit and breaking the fault current
All of these
carrying fault current for a short time
being closed on to a fault

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