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Axis undergo shifting as a result of armature reaction, can be balanced by ______

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Axis undergo shifting as a result of armature reaction, can be balanced by ______

(a) Increase in armature current

(b) Decrease in armature current

(c) Introducing interpoles

(d) Removing interpoles

I have been asked this question at a job interview.

My question is based upon Ways to Reduce Effects of Armature Reaction topic in chapter Armature Reaction of DC Machines

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Right choice is (c) Introducing interpoles

Explanation: Apart from distortion of the resultant flux density wave, its MNA also gets shifted from its GNA by a small angle α so that the brushes placed in GNA are no longer in MNA as is the case in the absence of armature current, due to armature reaction. This effect is countered by the interpoles placed in GNA.

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