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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