SWITCH GEAR QUIZ

series reactors should have

low resistance

high resistance

high impedance

low impedance

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Outdoor switchgear is generally used for voltage beyond

66 kV

11 kV

33 kV

132 kV

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Current chopping mainly occurs in

air-blast circuit breaker

oil circuit breaker

vaccum circuit breaker

sf 6 circuit breaker

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To reduce short circuit fault currents......... are used.

resistors

None of these

reactors

capacitors

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Minimum arcing voltage will be least in case of

tungsten

graphite

silver

carbon

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An overcurrent relay having current settling of 125% is connected to a supply circuit through a current transformer of 400/5 A. The pick-up current is

25 A

6.25 A

3.125 A

12.5 A

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The arcing contacts in a circuit breaker are made of

copper tungsten alloy

aluminium alloy

electrolytic copper

porcelain

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Admittance relay is

directional relay

non-directional relay

None of these

impedance relay

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Dc shunt relays are made of

many turns of thin wire

few turns of thin wire

many turns of thick wire

few turns of thick wire

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Series capacitors are used to

improve line voltage

None of these

compensate for line inductive reactance

compensate for line capacitive reactance

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