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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

6
2
8
4

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To protect most of the electrical equipment handling low power, the types of relays used are

Electronic and bimetallic
Thermocouple
Both of the listed here
None of these

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

2.5 A
1 A
5 A
more than 5A

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The arc voltage produced in AC circuit breaker is always

None of these
lagging the arc current by 90°
In phase with the arc current
leading the arc current by 90°

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A fuse should have

high conductivity
low melting point
All of these
low cost

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A fuse is a

current controlling device
current limiting device
None of these
protective device

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