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We can employ dummy coils in a DC machine to _________

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We can employ dummy coils in a DC machine to _________

(a) compensate reactance voltage

(b) reduce armature reaction

(c) provide mechanical balance to the armature

(d) improve the waveforms generated inside the commutator

I have been asked this question in a national level competition.

My doubt stems from Armature Windings in portion Armature Windings of Electrical Machines

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Correct option is (a) compensate reactance voltage

Explanation: Dummy coils are placed inside so that to provide mechanical support to dc machine and they do not take part in the emf development.

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