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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

80 kA
60 kA
20 kA
35 kA

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A circuit breaker must perform the duty of

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

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The rating of a circuit breaker is generally determined on the basis of

single line to ground fault current
double line to ground fault current
symmetrical fault current
line to line fault current

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The fusing factor is

always less than 1
None of these
always 1
always more than 1

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Air blast circuit breaker is used for

repeated duty
over currents
intermittent duty
short duty

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A fuse element is generally made of

silver
iron
steel
brass

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