Switchgear protections

41. 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.

42. 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

43. 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 ?

44. 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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