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Minimum arcing voltage will be least in case of

graphite
tungsten
carbon
silver

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For interrupting of high voltage and low current, the circuit breaker prefered is

oil circuit breaker
all are correct
air-blast circuit breaker
vaccum circuit breaker

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With which of the following, a circuit breaker must be equipped for remote operation ?

inverse time trip
shunt trip
None of these
time-delay trip

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series reactors should have

high impedance
high resistance
low resistance
low impedance

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Most of the relays on service on electric power system are

electro-mechanical relays
None of these
electronic relays
thermal relays

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Back up protection is generally used for protection against

both open and short-circuit faults
open-circuit faults only
short-circuit faults only
None of these

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