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The brushes in dc machine are normally placed electrically in interpolar region to ________

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The brushes in dc machine are normally placed electrically in interpolar region to ________

(a) make an angle of 90 deg. electrical

(b) make an angle of 90 deg. mechanical

(c) make an angle of 0 deg. electrical

(d) none of the mentioned

I have been asked this question in an interview for job.

Enquiry is from Action of Commutator in section Electrical Machine Applications/Armature Reaction and Commutation of Electrical Machines

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The correct choice is (a) make an angle of 90 deg. electrical

The explanation is: To obtain proper commutation without any sparks, the magnetic neutral axis and geometrical neutral axis should be aligned to each other,such that coils undergoing commutation experience zero emf across them.

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