Electrical Engineering MCQs

Page No. 324

When secondary of a current transformer is open-circuited its iron core will be__________?


a hot because of heavy iron losses taking place in it due to high flux density


bhot because primary will carry heavy current


ccool as there is no secondary current


dnone of above will happen



The efficiency of a transformer, under heavy loads, is comparatively low because_______________?


acopper loss becomes high in proportion to the output


biron loss is increased considerably


cvoltage drop both in primary and secondary becomes large


dsecondary output is much less as compared to primary input



The maximum load that a power transformer can carry is limited by its________________?


atemperature rise


bdielectric strength of oil


cvoltage ratio


dcopper loss


View Answer voltage ratio

The hum in a transformer is mainly attributed to______________?


aload changes


boil in the transformer


cmagnetostriction


dmechanical vibrations


View Answer magnetostriction

If a transformer is continuously operated the maximum temperature rise will occur in_______________?


acore


b windings


ctank


dany of the above


View Answer windings

Which of the following is the most likely source of harmonics in a transformer ?


a poor insulation


bOverload


cloose connections


d Core saturation


View Answer Core saturation

Iron loss of a transformer can be measured by____________?


alow power factor wattmeter


b unity power factor wattmeter


cfrequency meter


dany type of wattmeter



Which of the following loss in a transformer is zero even at full load ____________?


aCore loss


bFriction loss


cEddy current loss


d Hysteresis loss


View Answer Friction loss

Negative voltage regulation is indicative that the load is___________?


acapacitive only


binductive only


cinductive or resistive


d none of the above


View Answer capacitive only

Helical coils can be used on___________________?


alow voltage side of high kVA transformers


bhigh frequency transformers


chigh voltage side of small capacity transformers


dhigh voltage side of high kVA rating transformers



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