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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

4
8
6
2

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In a single bus-bar system there will be complete shut down when

two or more faults occur simultaneously
fault occurs with respect to earthing
fault occurs on neutral line
fault occurs on the bus itself

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For the same power, the least size is of

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

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Minimum arcing voltage will be least in case of

silver
carbon
tungsten
graphite

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SF 6 gas

Is nontoxic
has pungent small
is yellow in colour
is lighter than air

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Breaking capacity of a circuit breaker is usually expressed in terms of

amperes
volts
Mw
MVA

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