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While doing regular checks on the dc machine with the lap connected winding, it is reported to have ammeter fluctuations, this can be due to _________

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While doing regular checks on the dc machine with the lap connected winding, it is reported to have ammeter fluctuations, this can be due to _________

(a) different air gaps under poles

(b) variable reluctances in the core

(c) irregular design deformations

(d) all of the mentioned

I have been asked this question in an online quiz.

The question is from Armature Windings in portion Armature Windings of Electrical Machines

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The correct answer is (d) all of the mentioned

The explanation: In a lap winding configuration, if the machine as air gap variations due to the design aspects, it will give circulating current in the windings.

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