What statement is true concerning the use of commutating poles (also known as interpoles) in DC generators?

Correct Answer: Option D — These narrow poles are placed in the magnetic neutral plane between the main field poles and are designed to eliminate or reduce sparking caused by inductance of the armature coils.

Interpoles are narrow auxiliary poles positioned in the neutral plane between main poles. Wound in series with the armature, their magnetic field neutralizes armature reaction and counteracts coil inductance, effectively eliminating brush sparking during current commutation.