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A fuse element is generally made of

silver
brass
steel
iron

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Directional relay are based on flow of

voltage wave
current
power
All of these

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The rated secondary current of current transformer for relays is generally

5 A
30 A
10 A
20 A

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The voltage appearing across the contacts after opening of the circuit breaker is called

recovery voltage
surge voltage
operating voltage
arc voltage

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

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

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________ relay is preferred for phase fault on short transmission line.

Reactance
Impedance
None of these
Induction type

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