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The device that detects the fault in a power system is

None of these
isolator
relay
circuit breaker

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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

2
8
4
6

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Circuit breakers usually operate under

transient state of short circuit current
after dc component has ceased
sub-transient state of short circuit current
steady state of short circuit current

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The single phasing relays are used for the protection of

two phase motors only
single phase motors only
two single phase motors running in parallel
three phase motors

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The power loss is an important factor for the design of

generator
feeder
motor
transmission line

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

60 kA
35 kA
20 kA
80 kA

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