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A three phase circuit breaker is rated at 2000 MVA, 33 kv. The symmetrical breaking current is
60 kA
80 kA
35 kA
20 kA
60 kA
80 kA
35 kA
20 kA
Answer
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A short-circuit is identified by
voltage rise
no current flow
heavy current flow
voltage drop
voltage rise
no current flow
heavy current flow
voltage drop
Answer
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Arc in a circuit breaker is interrupted at
minimum voltage
zero current
maximum voltage
maximum current
minimum voltage
zero current
maximum voltage
maximum current
Answer
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Which of the following circuit breakers is prefered for EHT applications ?
Sf6 CB
bulk oil circuit breaker
low oil circuit breaker
air break circuit breaker
Sf6 CB
bulk oil circuit breaker
low oil circuit breaker
air break circuit breaker
Answer
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For which of the following protection from negative sequence currents is provided ?
Transmission line
Generators
Transformers
Motors
Transmission line
Generators
Transformers
Motors
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________ relay is preferred for phase fault on short transmission line.
Induction type
Impedance
None of these
Reactance
Induction type
Impedance
None of these
Reactance
Answer
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