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Back up protection is generally used for protection against
None of these
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
None of these
short-circuit faults only
open-circuit faults only
both open and short-circuit faults
Answer
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series reactors should have
low impedance
low resistance
high resistance
high impedance
low impedance
low resistance
high resistance
high impedance
Answer
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The operating time of a fuse is about
0.8 sec
1 sec
0.002 sec
1.5 sec
0.8 sec
1 sec
0.002 sec
1.5 sec
Answer
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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is
8
6
4
2
8
6
4
2
Answer
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The fusing factor is
always less than 1
always more than 1
None of these
always 1
always less than 1
always more than 1
None of these
always 1
Answer
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The arc voltage produced in AC circuit breaker is always
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
lagging the arc current by 90°
leading the arc current by 90°
None of these
In phase with the arc current
Answer
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