Electrical Engineering MCQs

Page No. 321

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


aBushings

✓


bCore

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cPrimary winding

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dSecondary winding

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View Answer Bushings

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


a Cellulose

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b Asbestos

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c Mica

✓


dGlass fibre

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View Answer Mica

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


ashort-circuit test

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b back-to-back test

✓


copen circuit test

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dany of the above

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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

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View Answer Horn gaps

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


a0.8 leading power factor

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b 0.8 lagging power factor

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czero power factor

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dunity power factor

✓


View Answer unity power factor

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


aOverfluxing protection

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bBuchholz relay

✓


c Overcurrent protection

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dAll of the above

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View Answer Buchholz relay

A transformer can have regulation closer to zero___________?


aon full-load

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bon overload

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con leading power factor

✓


don zero power factor

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


azero

✖


b 10 Q

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c1000 Q

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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

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cprotects the primary circuit

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dnone of the above

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A shell-type transformer has_________?


ahigh eddy current losses

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breduced magnetic leakage

✓


cnegligibly hysteresis losses

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d none of the above

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