The introduction of interpoles in between the main poles improves the performance of a dc machine, because
A. the interpoles produce additional flux to augment the developed torque
B. the flux waveform is improved with reduction in harmonics
C. the inequality of air-gap flux on the top and bottom halves of the armature is removed
D. a counter-emf is induced in the coil undergoing commutation
Show Answer
Answer: D
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