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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