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A transformer has comparitively much higher efficiency than a similar induction machine due to _________

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A transformer has comparitively much higher efficiency than a similar induction machine due to _________

(a) small air gaps

(b) no moving parts

(c) strong coupling

(d) all of the mentioned

The question was asked during an interview for a job.

This interesting question is from Transformer Construction topic in portion Transformers of Electrical Machines

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Correct answer is (d) all of the mentioned

For explanation I would say: Transformer does not has any moving components so losses are anyway reduced and also the coupling is very strong between two sides.

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