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The rated secondary current of current transformer for relays is generally

5 A
30 A
20 A
10 A

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The advantage of HRC fuse is that it

has high speed of operation
is quite cheap
does not deteriorate with age
All of these

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Current chopping mainly occurs in

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

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The pick-up current of a relay is 7.5 A and the fault current in relay is 30 A. Its plug-setting multiplier (P.S.M.) is

8
2
4
6

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If the fault occurs near the impedance relay, the V/ I ratio will be

constant for all distances
Lower than that of if fault occurs away from the relay
None of these
higher than that of if fault occurs away from the relay

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SF 6 gas

has pungent small
is yellow in colour
is lighter than air
Is nontoxic

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