Electrical Engineering MCQs

Page No. 322

N atural air coo ling is generally restricted for transformers up to__________?


a 1.5 MVA


b5 MVA


c15 MVA


d50 MVA


View Answer 1.5 MVA

The size of a transformer core will depend on__________?


afrequency


barea of the core


cflux density of the core material


d A. and B. both


View Answer A. and B. both

The secondary winding of which of the following transformers is always kept closed?


aStep-up transformer


b Step-down transformer


c Potential transformer


d Current transformer



The function of breather in a transformer is___________?


a to provide oxygen inside the tank


b to cool the coils during reduced load


cto cool the transformer oil


dto arrest flow of moisture when outside air enters the transformer



The efficiencies of transformers compared with that of electric motors of the same power are____________?


aabout the same


bmuch smaller


c much higher


dsomewhat smaller


View Answer much higher

The transformer oil should have _______ volatility and _______ viscosity?


a low,low


bhigh,high


clow,high


dhigh,low


View Answer low,low

In a step-down transformer, there is a change of 15 A in the load current. This results in change of supply current of_________________?


aless than 15 A


b more than 15 A


c15 A


d none of the above


View Answer less than 15 A

For the parallel operation of single phase transformers it is necessary that they should have___________?


asame efficiency


bsame polarity


csame kVA rating


dsame number of turns on the secondary side.


View Answer same polarity

Minimum voltage regulation occurs when the power factor of the load is_____________?


aunity


blagging


cleading


d zero


View Answer leading

Auto-transformer makes effective saving on copper and copper losses, when its transformation ratio is_________________?


aapproximately equal to one


bless than one


cgreat than one


dnone of the above



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