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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