Electrical Engineering MCQs

Page No. 332

Which of the following is not a part of transformer installation ?


aConservator


b Breather


cBuchholz relay


dExciter


View Answer Exciter

The purpose of providing an iron core in a transformer is to_____________?


a provide support to windings


b reduce hysteresis loss


cdecrease the reluctance of the magnetic path


dreduce eddy current losses



No-load current in a transformer________________?


alags behind the voltage by about 75°


b leads the voltage by about 75°


c lags behind the voltage by about 15°


d leads the voltage by about 15°



The efficiency of a transformer will be maximum when_____________?


acopper losses = hysteresis losses


bhysteresis losses = eddy current losses


ceddy current losses = copper losses


dcopper losses = iron losses



The permissible flux density in case of cold rolled grain oriented steel is around__________?


a1.7 Wb/m2


b2.7 Wb/m2


c3.7 Wb/m2


d4.7 Wb/m2


View Answer 1.7 Wb/m2

Sumpner’s test is conducted on transformers to determine_____________?


atemperature


b stray losses


call-day efficiency


dnone of the above


View Answer temperature

The dielectric strength of transformer oil is expected to be______________?


alkV


b 33 kV


c100 kV


d330 kV


View Answer 33 kV

No-load on a transformer is carried out to determine______________?


acopper loss


bmagnetising current


cmagnetising current and loss


defficiency of the transformer



The path of a magnetic flux in a transformer should have______________?


ahigh resistance


b high reluctance


c low resistance


dlow reluctance


View Answer low reluctance

The no-load current drawn by transformer is usually what per cent of the full-load current ?


a 0.2 to 0.5 per cent


b2 to 5 per cent


c12 to 15 per cent


d20 to 30 per cent


View Answer 2 to 5 per cent

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