Electrical Engineering MCQs

Page No. 321

Which of the following parts of a transformer is visible from outside ?


aBushings


bCore


cPrimary winding


dSecondary winding


View Answer Bushings

Which of the following insulating materials can withstand the highest temperature safely ?


a Cellulose


b Asbestos


c Mica


dGlass fibre


View Answer Mica

The efficiency of two identical transformers under load conditions can be determined by_______________?


ashort-circuit test


b back-to-back test


copen circuit test


dany of the above


View Answer back-to-back test

Which of the following acts as a protection against high voltage surges due to lightning and switching ?


aHorn gaps


bhermal overload relays


cBreather


dConservator


View Answer Horn gaps

For a transformer, operating at constant load current, maximum efficiency will occur at______________?


a0.8 leading power factor


b 0.8 lagging power factor


czero power factor


dunity power factor


View Answer unity power factor

Which of the following protection is normally not provided on small distribution transformers ?


aOverfluxing protection


bBuchholz relay


c Overcurrent protection


dAll of the above


View Answer Buchholz relay

A transformer can have regulation closer to zero___________?


aon full-load


bon overload


con leading power factor


don zero power factor



In a transformer the resistance between its primary and secondary should be_____________?


azero


b 10 Q


c1000 Q


dinfinity


View Answer infinity

The secondary of a current transformer is always short-circuited under operating conditions because it____________________?


a avoids core saturation and high voltage induction


b is safe to human beings


cprotects the primary circuit


dnone of the above



A shell-type transformer has_________?


ahigh eddy current losses


breduced magnetic leakage


cnegligibly hysteresis losses


d none of the above



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