Electrical Engineering MCQs

Page No. 323

Short circuit test on transformers is conducted to determine____________?


ahysteresis losses


b copper losses


ccore losses


deddy current losses


View Answer copper losses

If a transformer is switched on to a voltage more than the rated voltage______________?


aits power factor will deteriorate


bits power factor will increase


cits power factor will remain unaffected


d its power factor will be zero



Open circuit test on transformers is conducted to determine____________?


ahysteresis losses


bcopper losses


c core losses


d eddy current losses


View Answer core losses

Part of the transformer which is most subject to damage from overheating is_____________?


a iron core


bcopper winding


c winding insulation


d frame or case


View Answer winding insulation

During open circuit test of a transformer:


aprimary is supplied rated voltage


bprimary is supplied full-load current


cprimary is supplied current at reduced voltage


d primary is supplied rated kVA



The voltage transformation ratio of a transformer is equal to the ratio of_______________?


a primary turns to secondary turns


bsecondary current to primary current


c secondary induced e.m.f. to primary induced e.m.f


d secondary terminal voltage to primary applied voltage



A no-load test is performed on a transformer to determine_______________?


acore loss


bcopper loss


c efficiency


dmagnetising current and loss



Which type of winding is used in 3 phase shell-type transformer?


aCircular type


bSandwich type


c Cylindrical type


dRectangular type


View Answer Sandwich type

An open-circuit test on a transformer is conducted primarily to measure______________?


a insulation resistance


bcopper loss


ccore loss


dtotal loss


View Answer core loss

The transformer lamination’s are insulated from each other by____________?


amica strip


bthin coat of varnish


c paper


d any of the above


View Answer thin coat of varnish

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