Switchgear protections

[amp_mcq option1=”few turns of thin wire” option2=”few turns of thick wire” option3=”shunt relays are made of A. few turns of thin wire B. few turns of thick wire C. many turns of thin wire” option4=”many turns of thick wire” correct=”option3″]

Detailed SolutionD.C. shunt relays are made of

[amp_mcq option1=”insulation being overstressed due to over voltages” option2=”insulation overstress may lead to failure and subsequent phase to phase faults” option3=”being inadequately protected against ground fault” option4=”all of the above” correct=”option4″]

Detailed SolutionUngrounded neutral transmission system is not recommended because of system

[amp_mcq option1=”tapping” option2=”load end” option3=”sending end” option4=”sending and other end E. all of the above” correct=”option2″]

Detailed SolutionWhen a wave propagates on a transmission line, it suffers reflection several times at

[amp_mcq option1=”compensate for line inductive reactance” option2=”compensate for line capacitive reactance” option3=”improve line voltage” option4=”none of the above” correct=”option1″]

Detailed SolutionSeries capacitors are used to

[amp_mcq option1=”impedance” option2=”directional” option3=”non-directional” option4=”none of the above” correct=”option3″]

Detailed SolutionAdmittance relay is _______ relay.

[amp_mcq option1=”33kV to 66kV” option2=”22kV to 33kV” option3=”3.3kV and 11kV” option4=”none of the above” correct=”option1″]

Detailed SolutionResistance grounding is used for voltage between

[amp_mcq option1=”thermocouple” option2=”pyrometer” option3=”resistance thermometer” option4=”thermometer” correct=”option1″]

Detailed SolutionA _______ is used to measure the stator % winding temperature of the generator.

[amp_mcq option1=”the spring tension” option2=”the rate of flux built up” option3=”armature core air gap” option4=”all of the above” correct=”option4″]

Detailed SolutionThe relay operating speed depends upon

[amp_mcq option1=”Water” option2=”Oil” option3=”Air” option4=”SF6″ correct=”option4″]

Detailed SolutionWhich of the following medium is employed for extinction of arc in air circuit breaker ?

[amp_mcq option1=”fault occurs on the bus itself” option2=”fault occurs on neutral line” option3=”two or more faults occur simultaneously” option4=”fault occurs with respect to earthing” correct=”option1″]

Detailed SolutionIn a single bus-bar system there will be complete shut down when