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Singly and doubly excited magnetic systems applications are respectively ________

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Singly and doubly excited magnetic systems applications are respectively ________

(a) loud speakers and tachometers

(b) synchronous motors and moving iron instruments

(c) DC shunt machines and solenoids

(d) reluctance motors and synchronous motors

This question was addressed to me during an internship interview.

This is a very interesting question from Doubly Excited Magnetic Systems in portion Basic Concepts in Rotating Machines of Electrical Machines

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The correct option is (d) reluctance motors and synchronous motors

Explanation: Reluctance motors can work on single excitation, and synchronous motors require double excitation.

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