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Transformers

Transformers
Natural oil cooling is used for transformers up to a rating of

3000 kVA
1000 kVA
500 kVA
250 kVA

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Transformers
In an auto transformer, the primary and secondary are _____ coupled.

Magnetically as well as electrically
Only electrically
Only magnetically
None of the listed here

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Transformers
The winding of the transformer with greater number of turns will be _____

Either high or low voltage winding
None of the listed here
Low voltage winding
High voltage winding

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Transformers
Two things which are same for primary and secondary of transformer are ______

Resistance and leakage reactances
Currents and induced voltages
Ampere turns and voltage per turns
None of the listed here

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Transformers
The main reason for generation of harmonics in a transformer could be

poor insulation
fluctuating load
mechanical vibrations
saturation of core

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Transformers
A certain transformer has a turns ratio of 1 and a 0.85 coefficient of coupling. When 2 V ac is applied to the primary, the secondary voltage is

0.85 V
1 V
0 V
1.7 V

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MORE MCQ ON Transformers

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