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The primary and secondary of a transformer are ________ coupled but _______ connected.

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The primary and secondary of a transformer are ________ coupled but _______ connected.

(a) magnetically, not electrically

(b) electrically, not magnetically

(c) magnetically, also magnetically

(d) electrically, also electrically

This question was addressed to me in exam.

Asked question is from Transformer Construction topic in chapter Transformers of Electrical Machines

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The correct choice is (a) magnetically, not electrically

Easiest explanation: Transformer is the machine which has physical spacing and has magnetic circuit to exchange the voltage.

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