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Which of the following are examples of doubly-excited magnetic systems?

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Which of the following are examples of doubly-excited magnetic systems?

(a) Synchronous Machines

(b) Loudspeakers and Tachometers

(c) D.C Shunt Machines

(d) All of the mentioned

This question was posed to me at a job interview.

Query is from Doubly Excited Magnetic Systems in chapter Basic Concepts in Rotating Machines of Electrical Machines

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The correct choice is (d) All of the mentioned

Easiest explanation: All of the above applications require two independent sources of excitation.

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