Electrical Engineering MCQs

Page No. 317

When an alternator connected to the bus-bar is shut down the bus-bar voltage will___________?


afall


brise


cremain unchanged


dnone of the above


View Answer remain unchanged

The frequency of voltage generated, in case of generators, can be increased by___________?


ausing reactors


b increasing the load


cadjusting the governor


dreducing the terminal voltage



When the interconnector between two stations has large reactance?


athe transfer of power will take place with voltage fluctuation and noise


b the transfer of power will take place with least loss


cthe stations will fall out of step be¬cause of large angular displacement between the stations


dnone of the above



In the analysis of which of the following lines shunt capacitance is neglected?


aShort transmission lines


b Medium transmission lines


c Long transmission lines


dMedium as well as long transmission lines



For transmission of power over a distance of 500 km, the transmission voltage should be in the range?


a150 to 220 kV


b100 to 120 kV


c60 to 100 kV


d20 to 50 kV


View Answer 150 to 220 kV

The effect of corona can be detected by___________?


apresence of ozone detected by odour


bhissing sound


cfaint luminous glow of bluish colour


d all of the above


View Answer all of the above

On which of the following factors skin effect depends?


aFrequency of the current


bSize of the conductor


cResistivity of the conductor material


dAll of the above


View Answer All of the above

Constant voltage transmission entails the following disadvantage?


alarge conductor area is required for same power transmission


bshort-circuit current of the system is increased


ceither of the above


d none of the above



In a tap changing transformer, the tappings are provided on__________?


aprimary winding


bsecondary winding


chigh voltage winding


dany of the above


View Answer high voltage winding

Which of the following equipment, for regulating the voltage in distribution feeder, will be most economical?


aStatic condenser


bSynchronous condenser


cTap changing transformer


dBooster transformer


View Answer Booster transformer

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