Electrical Engineering MCQs

Page No. 311

The percentage O2 by Weight in atmospheric air is____________?


a18%


b23%


c77%


d79%


View Answer 23%

The commercial sources of energy are____________?


asolar, wind and biomass


bfossil fuels, hydropower and nuclear energy


cwood, animal wastes and agriculture wastes


dnone of the above



A 3-phase 4 wire system is commonly used on________________?


aprimary transmission


bsecondary transmission


cprimary distribution


dsecondary distribution



There is a greater possibility of occurence of corona during______________?


adry weather


bwinter


csummer heat


dhumid weather


View Answer humid weather

Which of the following is not a constituent for making porcelain insulators ?


aQuartz


b Kaolin


cFelspar


dSilica


View Answer Silica

Which of the following materials is used for overhead transmission lines ?


aSteel cored aluminium


b Galvanised steel


cCadmium copper


d Any of the above


View Answer Any of the above

The power transmitted will be maximum when____________?


acorona losses are minimum


breactance is high


csending end voltage is more


dreceiving end voltage is more



A feeder, in a transmission system, feeds power to________________?


adistributors


bgenerating stations


cservice mains


d all of the above


View Answer distributors

The presence of ozone due to corona is harmful because it________________?


areduces power factor


bcorrodes the material


cgives odour


dtransfer energy to the ground


View Answer corrodes the material

For an overhead line, the surge impedance is taken as________________?


a 20-30 ohms


b 70—80 ohms


c100—200 ohms


d500—1000 ohms


View Answer 100—200 ohms

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