Answer / bhabanipattanayak

As auto transformer contains
only one wdg. It uses less
copper. So copper loss is less
in auto transformer. So it's
efficiency is more than 2
wdg. Transformer.

Answer / pradyumna171

Autotransformer works on principle of self induction ie primary and secondary windings kept one side series and copper loss is more than transformer so it has less efficience.

pls send previous bhel electrical papers

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