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A fuse element is generally made of

silver
steel
iron
brass

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A fuse should have

low melting point
high conductivity
All of these
low cost

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

80 kA
60 kA
20 kA
35 kA

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When the circuit breaker operates under fault conditions, the greatest noise is produced in

vaccum circuit breaker
sf6 circuit breaker
oil circuit breaker
air-blast circuit breaker

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The device that detects the fault in a power system is

isolator
circuit breaker
relay
None of these

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