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A 3 phase synchronous machine is _________ excited machine.

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A 3 phase synchronous machine is _________ excited machine.

(a) doubly

(b) single

(c) two stage

(d) feedback based

The question was asked in examination.

My enquiry is from Excitation Systems for Synchronous Machines topic in chapter Synchronous Machines of Electrical Machines

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Correct answer is (a) doubly

Easiest explanation: The 3 phase synchronous machine has two excitations. Ac excitation at armature while dc excitation at field winding.

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