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HRC fuses provide best protection against

overload
short circuits
open circuits
reverse current

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Air blast circuit breakers for 400 kV power system are designed to operate in

0.1 sec
0.5 sec
50 milli-second
100 micro-second

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The torque produced in induction type relay is

inversely proportional to the square of the current
inversely proportional to the current
proportional to the current
proportional to square of the current

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Which of the following CB's is generally used in railways applications ?

sf 6 circuit breaker
air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker

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The transient voltage that appears across the contacts at the instant of arc extinction is called

peak voltage
restriking voltage
recovery voltage
supply voltage

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A fuse should have

high conductivity
All of these
low cost
low melting point

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