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

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b to increase the magnitude of mutual flux

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c to increase the magnitude of mutual flux

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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.

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cless will be the primary terminal voltage

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dnone of the above

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Spacers are provided between adjacent coils?


ato provide free passage to the cooling oil

✓


bto insulate the coils from each other

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cboth A. and (b)

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dnone of the above

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No-load current of a transformer has_____________?


ahas high magnitude and low power factor

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bhas high magnitude and high power factor

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chas small magnitude and high power factor

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d has small magnitude and low power factor

✓



Transformer breaths in when_______________?


aload on it increases

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b load on it decreases

✓


cload remains constant

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d none of the above

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The maximum efficiency of a distribution transformer is____________?


aat no load

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bat 50% full load

✓


cat 80% full load

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dat full load

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View Answer at 50% full load

Power transformers are designed to have maximum efficiency at___________?


a nearly full load

✓


b70% full load

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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

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c500 kVA

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d250 kVA

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View Answer 3000 kVA

In the transformer the function of a conservator is to_______________?


aprovide fresh air for cooling the transformer

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b supply cooling oil to transformer in time of need

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

✓


dnone of the above

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In a transformer routine efficiency depends upon_____________?


asupply frequency

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b load current

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cpower factor of load

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dboth B. and (c)

✓


View Answer both B. and (c)

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