Electrical Engineering MCQs

Page No. 155

Which of the following devices will receive voltage surge first travelling on the transmission line ?


a Lightning arresters


brelays


cStep-down transformer


dSwitchgear



A _________ is used to measure the stator % winding temperature of the generator?


athermocouple


bpyrometer


cresistance thermometer


dthermometer



Distance relays are generally_____________?


asplit-phase relays


b reactance relays


cimpedance relays


dnone of the above


View Answer none of the above

relays are used for phase faults on long line?


aImpedance


bReactance


cEither of the above


dNone of the above


View Answer Impedance

relay is preferred for phase fault on short transmission line?


aInduction type


bReactance


cImpedance


dNone of the above


View Answer Reactance

For which of the following ratings of the transformer differential protection is recommended ?


aabove 30 kVA.


bequal to and above 5 MVA


cequal to and above 25 MVA


dnone of the above



The short circuit in any winding of the transformer is the result of_______________?


amechanical vibration


binsulation failure


cloose connection


d impulse voltage


View Answer impulse voltage

Which of the following circuit breakers has high reliability and minimum maintenance ?


a Air blast circuit breakers


b Circuit breaker with SF6 gas


cVacuum circuit breakers


dOil circuit breakers



Over voltage protection is recommended for______________?


ahydro-electric generators


bsteam turbine generators


cgas turbine generators


dall of the above


View Answer all of the above

What will be the reflection co-efficient of the wave of load connected to transmission line if surge impedance of the line is equal to load ?


aZero


bUnity


cInfinity


dNone of the above


View Answer Zero

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