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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