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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