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In salient-pole machines, the armature mmf cannot be accounted for by introducing one equivalent reactance due to __________

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In salient-pole machines, the armature mmf cannot be accounted for by introducing one equivalent reactance due to __________

(a) non-uniform airgap

(b) variable resistance

(c) non-uniform air gap

(d) any of the mentioned

I had been asked this question in a job interview.

My enquiry is from Two Reaction Theory of Salient Pole Machines in portion Synchronous Machines of Electrical Machines

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The correct option is (a) non-uniform airgap

To elaborate: Due to saliency of the of the rotor poles, the air gap varies and the so one reactance is not sufficient to express the armature mmf.

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