Electrical Engineering MCQs

Page No. 330

The purpose of providing iron core in a step-up transformer is?


ato provide coupling between primary and secondary


b to increase the magnitude of mutual flux


c to increase the magnitude of mutual flux


dto provide all above features



Greater the secondary leakage flux____________?


aless will be the secondary induced e.m.f.


b less will be the primary induced e.m.f.


cless will be the primary terminal voltage


dnone of the above



Spacers are provided between adjacent coils?


ato provide free passage to the cooling oil


bto insulate the coils from each other


cboth A. and (b)


dnone of the above



No-load current of a transformer has_____________?


ahas high magnitude and low power factor


bhas high magnitude and high power factor


chas small magnitude and high power factor


d has small magnitude and low power factor



Transformer breaths in when_______________?


aload on it increases


b load on it decreases


cload remains constant


d none of the above



The maximum efficiency of a distribution transformer is____________?


aat no load


bat 50% full load


cat 80% full load


dat full load


View Answer at 50% full load

Power transformers are designed to have maximum efficiency at___________?


a nearly full load


b70% full load


c50% full load


dno load


View Answer nearly full load

Natural oil cooling is used for transformers up to a rating of____________?


a3000 kVA


b 1000 kVA


c500 kVA


d250 kVA


View Answer 3000 kVA

In the transformer the function of a conservator is to_______________?


aprovide fresh air for cooling the transformer


b supply cooling oil to transformer in time of need


c protect the transformer from damage when oil expends due to heating


dnone of the above



In a transformer routine efficiency depends upon_____________?


asupply frequency


b load current


cpower factor of load


dboth B. and (c)


View Answer both B. and (c)

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