[amp_mcq option1=”zero” option2=”infinity” option3=”unity” option4=”none of the above” correct=”option2″]
Detailed SolutionThe reflection co-efficient at the open circuited end of a transmission line.
Switchgear protections
42. To limit short-circuit current in a power system are used
[amp_mcq option1=”earth wires” option2=”isolators” option3=”H.R. fuses” option4=”reactors” correct=”option4″]
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 ?
[amp_mcq option1=”Generators” option2=”Motors” option3=”Transmission line” option4=”Transformers” correct=”option1″]
Detailed SolutionFor which of the following protection from negative sequence currents is provided ?
44. In Railway applications ______ circuit breaker is used.
[amp_mcq option1=”SFe” option2=”bulk oil” option3=”minimum oil” option4=”air break” correct=”option1″]
Detailed SolutionIn Railway applications ______ circuit breaker is used.