The compensating winding in a dc machine

The compensating winding in a dc machine

Q.The compensating winding in a dc machine 

A) Is located in armature slot for compensation of the armature reaction

B) Is located on commutating pole for improving commutation

C) Is located on pole shoe for avoiding the flash over at the commutator serface

D) Is located on pole shoe to avoid this parking at the Brushes

Answer

B) Is located on commutating pole for improving commutation

Exp. : The interpole air gap is made larger than that under the main field poles, in dc machines so that there is aturation at the root of the pole at heavy overioaus. B) Is located on commutating pole for improving commutation