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Directional relay are based on flow of

All of these
voltage wave
current
power

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Outdoor switchgear is generally used for voltage beyond

132 kV
33 kV
11 kV
66 kV

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Current chopping mainly occurs in

oil circuit breaker
sf 6 circuit breaker
vaccum circuit breaker
air-blast circuit breaker

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The transient voltage that appears across the contacts at the instant of arc extinction is called

recovery voltage
peak voltage
restriking voltage
supply voltage

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The fuse wire, in D.C. circuits, is inserted in

none of the listed here
positive circuit only
negative circuit only
Both of the listed here

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Which of the following circuit breakers is prefered for EHT applications ?

low oil circuit breaker
Sf6 CB
air break circuit breaker
bulk oil circuit breaker

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