Electrical Engineering MCQs

Page No. 327

Silicon steel used in lamination’s mainly reduces___________?


a hysteresis loss


beddy current losses


c copper losses


dall of the above


View Answer hysteresis loss

Delta/star transformer works satisfactorily when______________?


aload is balanced only


b load is unbalanced only


con balanced as well as unbalanced loads


dnone of the above



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


b Low hysteresis loss


cHigh thermal conductivity


d High permeability



Distribution transformers are generally designed for maximum efficiency around________________?


a90% load


bzero load


c 25% load


d 50% load


View Answer 50% load

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


aaverage value


b r.m.s. value


cmaximum value


d instantaneous value


View Answer maximum value

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


afluctuating load


b poor insulation


cmechanical vibrations


dsaturation of core


View Answer saturation of core

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


a50°C


b80°C


c100°C


d150°C


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


b 1600 W


c800 W


d400 W


View Answer 400 W

A Buchholz relay can be installed on______________?


a Buchholz relay can be installed on


bair-cooled transformers


cwelding transformers


doil cooled transformers



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