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Series capacitors are used to
compensate for line inductive reactance
improve line voltage
compensate for line capacitive reactance
None of these
compensate for line inductive reactance
improve line voltage
compensate for line capacitive reactance
None of these
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Back up protection is generally used for protection against
open-circuit faults only
None of these
both open and short-circuit faults
short-circuit faults only
open-circuit faults only
None of these
both open and short-circuit faults
short-circuit faults only
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
lag time
clearing time
lead time
operation time
lag time
clearing time
lead time
operation time
Answer
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A circuit breaker must perform the duty of
All of these
opening the faulty circuit and breaking the fault current
carrying fault current for a short time
being closed on to a fault
All of these
opening the faulty circuit and breaking the fault current
carrying fault current for a short time
being closed on to a fault
Answer
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The reflection co-efficient at the open circuited end of a transmission line
infinity
zero
unity
None of these
infinity
zero
unity
None of these
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The information to the circuit breaker under fault conditions is provided by
rewirable fuse
H.R.'only
relay
All of these
rewirable fuse
H.R.'only
relay
All of these
Answer
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