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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as
operation time
clearing time
lag time
lead time
operation time
clearing time
lag time
lead time
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An isolator is designed to open a circuit under
None of these
full load
normal conditions
no load
None of these
full load
normal conditions
no load
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SF6 gas
None of these
is nontoxic
is lighter than air
has pungent small
is yellow in colour
None of these
is nontoxic
is lighter than air
has pungent small
is yellow in colour
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The device that detects the fault in a power system is
isolator
circuit breaker
None of these
relay
isolator
circuit breaker
None of these
relay
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Interruption of large currents by relay requires
high speed opening of contacts
arc suppressing blow out coils
all of these
wide separation of the opened contacts
high speed opening of contacts
arc suppressing blow out coils
all of these
wide separation of the opened contacts
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In Railway applications ______ circuit breaker is used.
air break
bulk oil
minimum oil
SFe
air break
bulk oil
minimum oil
SFe
Answer
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