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The reflection co-efficient at the open circuited end of a transmission line

None of these
zero
unity
infinity

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Dc shunt relays are made of

many turns of thin wire
many turns of thick wire
few turns of thin wire
few turns of thick wire

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

0.10 sec
0.01 sec
0.001 sec
0.003 sec

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For the same power, the least size is of

oil circuit breaker
sf6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker

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The current rating of a fuse is 5A. The fusing current will be

more than 5A
2.5 A
5 A
1 A

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The fuse rating is expressed in terms of

current
kVA
VAR
voltage

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