Electrical Engineering MCQs

Page No. 329

The transformer ratings are usually expressed in terms of______________?


avolts


b amperes


ckW


dkVA


View Answer kVA

An ideal transformer has infinite values of primary and secondary inductances. The statement is______________?


atrue


bfalse


ctrue


dfalse


View Answer false

The chemical used in breather for transformer should have the quality of____________?


aionizing air


babsorbing moisture


ccleansing the transformer oil


dcooling the transformer oil


View Answer absorbing moisture

The use of higher flux density in the transformer design____________?


areduces weight per kVA


breduces iron losses


creduces copper losses


dincreases part load efficiency



In a transformer the tappings are generally provided on_____________?


aprimary side


b secondary side


c low voltage side


dhigh voltage side`


View Answer high voltage side

What will happen if the transformers working in parallel are not connected with regard to polarity ?


a The power factor of the two trans-formers will be different from the power factor of common load


bIncorrect polarity will result in dead short circuit


c The transformers will not share load in proportion to their kVA ratings


dnone of the above



If the percentage impedances of the two transformers working in parallel are different, then______________________?


a transformers will be overheated


bpower factors of both the transformers will be same


cparallel operation will be not possible


dparallel operation will still be possible, but the power factors at which the two transformers operate will be different from the power factor of the common load



If R2 is the resistance of secondary winding of the transformer and K is the transformation ratio then the equivalent secondary resistance referred to primary will be___________?


aR2/VK


bR2IK2


cR22!K2


d R22/K


View Answer R2IK2

Two transformers operating in parallel will share the load depending upon their____________?


a leakage reactance


bper unit impedance


cefficiencies


dratings


View Answer per unit impedance

The power transformer is a constant______________?


avoltage device


bcurrent device


cpower device


dmain flux device


View Answer main flux device

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