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The relay operating coil is supplied through

None of these
power transformer
current transformer
fuse

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The fault that imposes severest duty on the circuit breaker is

two lines to ground fault
line to line fault
line to ground fault
all three lines short-circuited

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Most of the relays on service on electric power system are

None of these
thermal relays
electro-mechanical relays
electronic relays

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A fuse performs

detection function only
circuit interruption function only
both detection and interruption functions
None of these

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In Railway applications ______ circuit breaker is used.

bulk oil
SFe
minimum oil
air break

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The normal current in a power line is 100 A. If a short-circuit fault occurs on the line, then one can expect the short-circuit current to be

300 A
100 A
more than 1000 A
200 A

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