Electrical Engineering MCQs

Page No. 327

Silicon steel used in lamination’s mainly reduces___________?


a hysteresis loss

✓


beddy current losses

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c copper losses

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dall of the above

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View Answer hysteresis loss

Delta/star transformer works satisfactorily when______________?


aload is balanced only

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b load is unbalanced only

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con balanced as well as unbalanced loads

✓


dnone of the above

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Star/star transformers work satisfactorily when________________?


a load is unbalanced only

✖


bload is balanced only

✓


con balanced as well as unbalanced loads

✖


dnone of the above

✖


View Answer load is balanced only

Which of the following property is not necessarily desirable in the material for transformer core ?


aMechanical strength

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b Low hysteresis loss

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cHigh thermal conductivity

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d High permeability

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Distribution transformers are generally designed for maximum efficiency around________________?


a90% load

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bzero load

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c 25% load

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d 50% load

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View Answer 50% load

The value of flux involved m the e.m.f. equation of a transformer is____________?


aaverage value

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b r.m.s. value

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cmaximum value

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d instantaneous value

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View Answer maximum value

The main reason for generation of harmonics in a transformer could be_______________?


afluctuating load

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b poor insulation

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cmechanical vibrations

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dsaturation of core

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View Answer saturation of core

Gas is usually not liberated due to dissociation of transformer oil unless the oil temperature exceeds?


a50°C

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b80°C

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c100°C

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d150°C

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View Answer 150°C

The full-load copper loss of a trans¬former is 1600 W. At half-load, the copper loss will be___________?


a6400 W

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b 1600 W

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c800 W

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d400 W

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View Answer 400 W

A Buchholz relay can be installed on______________?


a Buchholz relay can be installed on

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bair-cooled transformers

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cwelding transformers

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doil cooled transformers

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