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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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The time-current graph of a fuse

None of these
is a circle
has a linear characteristic
has inverse characteristic

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A differential relay measures the vector difference between

two currents
two or more similar electrical quantities
None of these
two voltages

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The fuse rating is expressed in terms of

kVA
voltage
current
VAR

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The single phasing relays are used for the protection of

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

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Arc in a circuit breaker is interrupted at

maximum voltage
maximum current
minimum voltage
zero current

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