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


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



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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