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

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d50 MVA

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View Answer 1.5 MVA

The size of a transformer core will depend on__________?


afrequency

✖


barea of the core

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cflux density of the core material

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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

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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

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bmuch smaller

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c much higher

✓


dsomewhat smaller

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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

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bsame polarity

✓


csame kVA rating

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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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