Electrical Engineering MCQs

Page No. 325

If the supply frequency to the transformer is increased,”the iron loss will__________?


a not change

✖


bdecrease

✖


cincrease

✓


dany of the above

✖


View Answer increase

Which of the following is not a routine test on transformers ?


aCore insulation voltage test

✖


bImpedance test

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cRadio interference test

✓


dPolarity test

✖



An ideal transformer will have maximum efficiency at a load such that?


a copper loss = iron loss

✓


bcopper loss iron loss

✖


c none of the above

✖


dcopper loss iron loss

✖



A transformer can have zero voltage regulation at______________?


a leading power factor

✓


blagging power factor

✖


cunity power factor

✖


dzero power factor

✖



Noise level test in a transformer is a______________?


aspecial test

✖


b routine test

✖


ctype test

✓


d none of the above

✖


View Answer type test

In an actual transformer the iron loss remains practically constant from no load to full load because:____________?


avalue of transformation ratio remains constant

✖


b permeability of transformer core remains constant

✖


ccore flux remains practically constant

✓


dprimary voltage remains constant

✖



The path of the magnetic flux in transformer should have____________?


ahigh reluctance

✖


b low reactance

✓


chigh resistance

✖


d. low resistance

✖


View Answer low reactance

When a given transformer is run at its rated voltage but reduced frequency, its____________?


a flux density remains unaffected

✖


b iron losses are reduced

✖


ccore flux density is reduced

✖


dcore flux density is increased

✓



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


aLow hysteresis loss

✖


b High permeability

✖


cHigh thermal conductivity

✓


dAdequate mechanical strength

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The leakage flux in a transformer depends upon______________?


a load current

✓


b load current and voltage

✖


c load current, voltage and frequency

✖


dD. load current, voltage, frequency and power factor

✖


View Answer load current

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