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Most of the electromagnetic energy conversion devices belong to __________

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Most of the electromagnetic energy conversion devices belong to __________

(a) singly excited magnetic systems

(b) doubly excited magnetic systems

(c) multiply excited magnetic systems

(d) both doubly excited magnetic systems and multiply excited magnetic systems

I had been asked this question in my homework.

My question is taken from Doubly Excited Magnetic Systems in chapter Basic Concepts in Rotating Machines of Electrical Machines

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Right choice is (d) both doubly excited magnetic systems and multiply excited magnetic systems

Explanation: Widely used motor/generators such as synchronous and induction machines belong to doubly excited systems, and many other practical applications require multiply excited magnetic systems.

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