Electrical Engineering MCQs

Page No. 332

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


aConservator

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b Breather

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cBuchholz relay

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dExciter

✓


View Answer Exciter

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


a provide support to windings

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b reduce hysteresis loss

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cdecrease the reluctance of the magnetic path

✓


dreduce eddy current losses

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No-load current in a transformer________________?


alags behind the voltage by about 75°

✓


b leads the voltage by about 75°

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c lags behind the voltage by about 15°

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d leads the voltage by about 15°

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The efficiency of a transformer will be maximum when_____________?


acopper losses = hysteresis losses

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bhysteresis losses = eddy current losses

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ceddy current losses = copper losses

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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

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c3.7 Wb/m2

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d4.7 Wb/m2

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View Answer 1.7 Wb/m2

Sumpner’s test is conducted on transformers to determine_____________?


atemperature

✓


b stray losses

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call-day efficiency

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dnone of the above

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View Answer temperature

The dielectric strength of transformer oil is expected to be______________?


alkV

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b 33 kV

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c100 kV

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d330 kV

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View Answer 33 kV

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


acopper loss

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bmagnetising current

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cmagnetising current and loss

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defficiency of the transformer

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


ahigh resistance

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b high reluctance

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c low resistance

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dlow reluctance

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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

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b2 to 5 per cent

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c12 to 15 per cent

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d20 to 30 per cent

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View Answer 2 to 5 per cent

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