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

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

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

3.125 A
12.5 A
25 A
6.25 A

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Arc in a circuit breaker is interrupted at

zero current
maximum voltage
maximum current
minimum voltage

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A circuit breaker must perform the duty of

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

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

35 kA
60 kA
80 kA
20 kA

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The fuse wire, in D.C. circuits, is inserted in

positive circuit only
Both of the listed here
negative circuit only
none of the listed here

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