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The relay operating coil is supplied through

power transformer
None of these
fuse
current transformer

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A fuse should have

high conductivity
low cost
low melting point
All of these

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The fusing factor is

always more than 1
always 1
always less than 1
None of these

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For which of the following protection from negative sequence currents is provided ?

Generators
Transformers
Motors
Transmission line

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The fault that imposes severest duty on the circuit breaker is

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

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A short-circuit is identified by

no current flow
voltage drop
heavy current flow
voltage rise

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