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Armature reaction of an unsaturated DC machine is (in terms of magnetization) ________

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Armature reaction of an unsaturated DC machine is (in terms of magnetization) ________

(a) Cross-magnetizing

(b) Demagnetizing

(c) Magnetizing

(d) Cannot be determined

I got this question during an internship interview.

Enquiry is from Armature Reaction -1 in section Armature Reaction of DC Machines

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The correct option is (a) Cross-magnetizing

To elaborate: Initially at unsaturated condition in a DC machine armature reaction lies along the q-axis. It will cause no change in flux/pole if iron is unsaturated. Now, when iron gets saturated axis gets shifted which will cause reduction in flux/pole.

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