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The fusing factor is
always less than 1
None of these
always 1
always more than 1
always less than 1
None of these
always 1
always more than 1
Answer
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Related Question
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A differential relay measures the vector difference between
two currents
None of these
two or more similar electrical quantities
two voltages
two currents
None of these
two or more similar electrical quantities
two voltages
Answer
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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as
lead time
clearing time
operation time
lag time
lead time
clearing time
operation time
lag time
Answer
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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is
3.125 A
25 A
6.25 A
12.5 A
3.125 A
25 A
6.25 A
12.5 A
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
2
4
8
6
2
4
8
6
Answer
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Interruption of large currents by relay requires
high speed opening of contacts
all of these
arc suppressing blow out coils
wide separation of the opened contacts
high speed opening of contacts
all of these
arc suppressing blow out coils
wide separation of the opened contacts
Answer
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