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HRC fuses provide best protection against

reverse current
overload
short circuits
open circuits

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The time-current graph of a fuse

is a circle
has a linear characteristic
None of these
has inverse characteristic

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Which of the following circuit breakers is prefered for EHT applications ?

Sf6 CB
bulk oil circuit breaker
air break circuit breaker
low oil circuit breaker

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The arcing contacts in a circuit breaker are made of

porcelain
electrolytic copper
copper tungsten alloy
aluminium alloy

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Circuit breakers usually operate under

after dc component has ceased
sub-transient state of short circuit current
transient state of short circuit current
steady state of short circuit current

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

operating voltage
arc voltage
recovery voltage
surge voltage

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