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Air blast circuit breaker is used for

over currents
repeated duty
short duty
intermittent duty

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The information to the circuit breaker under fault conditions is provided by

rewirable fuse
relay
All of these
H.R.'only

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________ relay is preferred for phase fault on short transmission line.

Reactance
None of these
Impedance
Induction type

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Minimum arcing voltage will be least in case of

tungsten
graphite
carbon
silver

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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
12.5 A
6.25 A

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The voltage appearing across the contacts after opening of the circuit breaker is called

surge voltage
arc voltage
operating voltage
recovery voltage

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