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An isolator is designed to open a circuit under

normal conditions
no load
full load
None of these

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A fuse is a

current controlling device
current limiting device
protective device
None of these

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A circuit breaker is a

current limiting device
circuit interrupting device
None of these
current controlling device

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When a fault occur in a power system, the circuit breaker

is opened manually
None of these
is opened by remote control
opens automatically

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The relay operating coil is supplied through

power transformer
None of these
fuse
current transformer

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