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The operating time of a circuit breaker is
0.002 sec
0.001 sec
0.2 sec
0.05 sec
0.002 sec
0.001 sec
0.2 sec
0.05 sec
Answer
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The single phasing relays are used for the protection of
three phase motors
two single phase motors running in parallel
single phase motors only
two phase motors only
three phase motors
two single phase motors running in parallel
single phase motors only
two phase motors only
Answer
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For the protection of power station buildings against direct strokes the requirements are
None of these
interception, conduction and dissipation
interception and conduction
interception
interception, conduction, dissipation and reflection
None of these
interception, conduction and dissipation
interception and conduction
interception
interception, conduction, dissipation and reflection
Answer
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The material used for fuse must have
Low melting point and low specific resistance
high melting point and low specific resistance
low melting point and high specific resistance
low melting point and any specific resistance
Low melting point and low specific resistance
high melting point and low specific resistance
low melting point and high specific resistance
low melting point and any specific resistance
Answer
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A short-circuit is identified by
heavy current flow
voltage rise
no current flow
voltage drop
heavy current flow
voltage rise
no current flow
voltage drop
Answer
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Dc shunt relays are made of
few turns of thick wire
few turns of thin wire
many turns of thick wire
many turns of thin wire
few turns of thick wire
few turns of thin wire
many turns of thick wire
many turns of thin wire
Answer
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