Switchgear protections Archives - Page 10 of 10 - MCQ and Quiz for Exams

91. The reflection co-efficient at the open circuited end of a transmission line.

zero

infinity

unity

none of the above

Detailed SolutionThe reflection co-efficient at the open circuited end of a transmission line.

92. To limit short-circuit current in a power system are used

earth wires

isolators

H.R. fuses

reactors

Detailed SolutionTo limit short-circuit current in a power system are used

93. For which of the following protection from negative sequence currents is provided ?

Generators

Motors

Transmission line

Transformers

Detailed SolutionFor which of the following protection from negative sequence currents is provided ?

94. In Railway applications ______ circuit breaker is used.

SFe

bulk oil

minimum oil

air break

Detailed SolutionIn Railway applications ______ circuit breaker is used.

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