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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