Electrical Engineering MCQs

Page No. 97

Which of the following methods does not take into account the maximum temperature rise under variable load conditions ?


aEquivalent power method


b Equivalent current method


cMethod of average losses


dEquivalent torque method



The time taken by the machine to attain 0.632 of its final steady temperature rise is called_____________?


aheating time constant


bcooling time constant


ceither A. or B.


dnone of the above


View Answer heating time constant

With direct water cooling it is possible to have ratings of about_____________?


a200 MW


b300 MW


c400 MW


d 600 MW


View Answer 600 MW

In self cooled motors the cooling time constant is about ___________ than the heating time constant because cooling conditions are worse at standstill?


a2 to 3 times greater


b3 to 4 times greater


c4 to 5 times greater


dnone of the above


View Answer 2 to 3 times greater

Direct water cooling of rotor winding presents_____________?


ano mechanical difficulties


b lesser mechanical difficulties


c greater mechanical difficulties


dnone of the above



In direct cooled system using hydrogen both stator and rotor conductors are made____________?


asolid


bhollow


c perforated


dany ofthe above


View Answer any ofthe above

The resistivity of water should not be less than_____________?


a10 Q m


b 100 Q m


c1000 Q m


d2000 Q m


View Answer 2000 Q m

Machines cooled by direct cooling method may be called_____________?


a“supercharged”


b “inner cooled”


c“conductor cooled”


d any of the above


View Answer any of the above

The density of hydrogen is __________ times the density of air?


a0.07


b1.5


c2.5


d3.5


View Answer 0.07

Which of the following is an advantage of hydrogen cooling ?


aIncrease in efficiency


b Increase in ratings


cIncrease in life


dAll of the above


View Answer All of the above

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