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A fuse should have

low melting point
low cost
All of these
high conductivity

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Directional relay are based on flow of

voltage wave
power
current
All of these

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

peak voltage
recovery voltage
supply voltage
restriking voltage

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Current chopping mainly occurs in

vaccum circuit breaker
sf 6 circuit breaker
oil circuit breaker
air-blast circuit breaker

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To reduce short circuit fault currents......... are used.

capacitors
None of these
reactors
resistors

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The time of closing the cycle, in modern circuit breakers is

0.003 sec
0.001 sec
0.10 sec
0.01 sec

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