While doing regular checks on the dc machine with the lap connected

while-doing-regular-checks-on-the-dc-machine-with-the-lap-connected

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

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.