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Auto transformer rating is chosen so as to have best performance when the analogous two winding transformer has ___________

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Auto transformer rating is chosen so as to have best performance when the analogous two winding transformer has ___________

(a) two voltage levels fairly close to each other

(b) very high transformation ratio

(c) any voltage levels

(d) step down purpose

The question was asked at a job interview.

I would like to ask this question from Machine Ratings topic in division Rating and Loss Dissipation of Electrical Machines

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The correct answer is (a) two voltage levels fairly close to each other

The explanation: The auto transformer is best suited with the voltage levels of same rating for a two winding transformer.

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