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The rated secondary current of current transformer for relays is generally

20 A
30 A
10 A
5 A

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Arc in a circuit breaker is interrupted at

maximum voltage
zero current
maximum current
minimum voltage

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The rate of rise of restriking voltage depends on

the capacitance of the system only
both inductance and capacitance of the system
the type of circuit breaker
the inductance of the system only

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

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

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protection of fuses is generally not used beyond

20 A
50 A
200 A
100 A

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Minimum arcing voltage will be least in case of

carbon
graphite
silver
tungsten

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