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Admittance relay is

non-directional relay
None of these
directional relay
impedance relay

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Current chopping mainly occurs in

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

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

60 kA
35 kA
20 kA
80 kA

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Which of the following CB's is generally used in railways applications ?

air break circuit breaker
bulk oil circuit breaker
low oil circuit breaker
sf 6 circuit breaker

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The short circuit in any winding of the transformer is the result of

impulse voltage
mechanical vibration
loose connection
insulation failure

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The rating of a circuit breaker is generally determined on the basis of

symmetrical fault current
line to line fault current
single line to ground fault current
double line to ground fault current

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