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The relay operating coil is supplied through

None of these
current transformer
fuse
power transformer

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A fuse is never inserted in

positive of dc circuit
phase line
negative of dc circuit
neutral wire

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Relay can be designed to respond to changes in

All of these
resistance, reactance and impedance
temperature
voltage and current

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The making capacity of a circuit breaker is equal to

2.55 × symmetrical breaking capacity
√2 × symmetrical breaking capacity
None of these
√3 × symmetrical breaking capacity

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For the same power, the least size is of

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

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SF 6 gas

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

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