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Mark the most incorrect. In dc generator, commutation can be improved by __________

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Mark the most incorrect. In dc generator, commutation can be improved by __________

(a) using interpoles

(b) using carbon brushes

(c) shifting brush axis in direction of armature rotation

(d) none of the mentioned

I had been asked this question during an internship interview.

My doubt stems from Effect of Brush Shift and Compensation Windings in chapter DC Machines of Electrical Machines

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Right option is (a) using interpoles

The explanation is: All the given measures are used to eliminate the effect of armature reaction and hence improves commutation also.

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