Correct option is D
· The winding of interpoles in a DC machine is connected
in series with the armature winding. Interpoles, also known as commutating poles, are small auxiliary poles placed between the main poles of a DC machine.
· They help improve commutation by reducing sparking at the brushes. Since they are connected in series with the armature, the interpoles carry the same current as the armature, which allows them to generate a magnetic field proportional to the armature current, thereby compensating for the reactance voltage induced in the armature.
