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Directional relay are based on flow of
current
power
All of these
voltage wave
current
power
All of these
voltage wave
Answer
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The time of closing the cycle, in modern circuit breakers is
0.003 sec
0.01 sec
0.10 sec
0.001 sec
0.003 sec
0.01 sec
0.10 sec
0.001 sec
Answer
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Air blast circuit breaker is used for
short duty
intermittent duty
repeated duty
over currents
short duty
intermittent duty
repeated duty
over currents
Answer
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The relay operating coil is supplied through
current transformer
fuse
power transformer
None of these
current transformer
fuse
power transformer
None of these
Answer
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The single phasing relays are used for the protection of
two single phase motors running in parallel
single phase motors only
three phase motors
two phase motors only
two single phase motors running in parallel
single phase motors only
three phase motors
two phase motors only
Answer
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Switch Gear
________ relay is preferred for phase fault on short transmission line.
Impedance
Reactance
None of these
Induction type
Impedance
Reactance
None of these
Induction type
Answer
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