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A fuse element is generally made of

steel
brass
silver
iron

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

80 kA
20 kA
35 kA
60 kA

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The arcing contacts in a circuit breaker are made of

aluminium alloy
copper tungsten alloy
electrolytic copper
porcelain

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series reactors should have

low impedance
high impedance
high resistance
low resistance

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

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

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In a single bus-bar system there will be complete shut down when

fault occurs with respect to earthing
two or more faults occur simultaneously
fault occurs on the bus itself
fault occurs on neutral line

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