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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

4
2
6
8

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

2.5 A
more than 5A
5 A
1 A

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

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

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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is

20 kA
60 kA
35 kA
80 kA

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Relay can be designed to respond to changes in

voltage and current
resistance, reactance and impedance
temperature
All of these

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In a circuit breaker the time duration from the instant of the fault to extinction of arc is known as

lead time
clearing time
operation time
lag time

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