Electrical Engineering MCQs

Page No. 331

The no load current in a transformer lags behind the applied voltage by an angle of about_____________?


a180°


b120″


c90°


d75°


View Answer 90°

A common method of cooling a power transformer is_______________?


anatural air cooling


bair blast cooling


coil cooling


dany of the above


View Answer oil cooling

In a given transformer for given applied voltage, losses which remain constant irrespective of load changes are______________?


afriction and windage losses


bcopper losses


chysteresis and eddy current losses


d none of the above



Efficiency of a power transformer is of the order of________________?


a100 per cent


b98 per cent


c50 per cent


d25 per cent


View Answer 98 per cent

Which winding in a transformer has more number of turns ?


aLow voltage winding


bHigh voltage winding


cPrimary winding


dSecondary winding


View Answer High voltage winding

Primary winding of a transformer________________?


a is always a low voltage winding


bis always a high voltage winding


ccould either be a low voltage or high voltage winding


dnone of the above



A transformer cannot raise or lower the voltage of a D.C. supply because_______________?


athere is no need to change the D.C. voltage


ba D.C. circuit has more losses


cFaraday’s laws of electromagnetic induction are not valid since the rate of change of flux is zero


dnone of the above



A transformer transforms__________________?


a voltage


bcurrent


cpower


dfrequency


View Answer power

In the transformer following winding has got more cross-sectional area______________?


a Low voltage winding


bHigh voltage winding


cPrimary winding


d Secondary winding



While conducting short-circuit test on a transformer the following side is short circuited?


aHigh voltage side


bLow voltage side


cPrimary side


dSecondary side


View Answer Low voltage side

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