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If the magnetic circuit of the dc machine is in the saturation region, the armature reaction __________

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If the magnetic circuit of the dc machine is in the saturation region, the armature reaction __________

(a) does not affect flux/pole

(b) increases the flux/pole

(c) decreases flux/pole

(d) affects the flux/pole only when armature current is small

I had been asked this question in class test.

This interesting question is from Effect of Brush Shift and Compensation Windings in portion DC Machines of Electrical Machines

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The correct option is (a) does not affect flux/pole

For explanation: In the saturation region the flux will be constant.

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