Electrical Engineering MCQs

Page No. 326

An ideal transformer is one which has_____________?


ano losses and magnetic leakage


b interleaved primary and secondary windings


ca common core for its primary and secondary windings


dcore of stainless steel and winding of pure copper metal



Which of the following does not change in an ordinary transformer ?


aFrequency


bVoltage


cCurrent


dAny of the above


View Answer Frequency

The changes in volume of transformer cooling oil due to variation of atmospheric temperature during day and night is taken care of by which part of transformer?


aConservator


b Breather


cBushings


d Buchholz relay


View Answer Conservator

The magnetising current of a transformer is usually small because it has___________?


asmall air gap


blarge leakage flux


claminated silicon steel core


d fewer rotating parts


View Answer small air gap

Buchholz’s relay gives warning and protection against_________________?


a electrical fault inside the transformer itself


belectrical fault outside the transformer in outgoing feeder


cfor both outside and inside faults


dnone of the above



Two transformers are connected in parallel. These transformers do not have equal percentage impedance. This is likely to result in____________?


ahort-circuiting of the secondaries


bpower factor of one of the transformers is leading while that of the other lagging


c transformers having higher copper losses will have negligible core losses


dloading of the transformers not in proportion to their kVA ratings



During short circuit test iron losses are negligible because of _____________?


athe current on secondary side is negligible


bthe voltage on secondary side does not vary


cthe voltage applied on primary side is low


dfull-load current is not supplied to the transformer



Which of the following is the main advantage of an auto-transformer over a two winding transformer?


aHysteresis losses are reduced


bSaving in winding material


cCopper losses are negligible


dEddy losses are totally eliminated



Power transformers are generally designed to have maximum efficiency around__________?


ano-load


b half-load


cnear full-load


dnear full-load


View Answer near full-load

Which winding of the transformer has less cross-sectional area?


aPrimary winding


bSecondary winding


clow voltage winding


d High voltage winding



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