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Electromagnetic torque is present in rotating machines when ____________

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Electromagnetic torque is present in rotating machines when ____________

(a) both stator and rotor windings carry current

(b) rotor windings carry current

(c) stator windings carry current

(d) any of the mentioned

The question was posed to me in an interview.

This question is from Synchronizing Power and Synchronizing Torque in chapter Synchronous Machine Stability of Electrical Machines

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Best answer
Correct option is (a) both stator and rotor windings carry current

Explanation: Synchronous machine is a doubly excited machine.

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