🔍 Key Concepts

• Location and labeling of interpoles in the illustration relative to the main field poles and commutator • Effect of armature reaction in a DC generator on the neutral plane and brush sparking • Difference between main field poles and auxiliary poles (such as interpoles or compensating windings) in a DC machine

💭 Think About

• Look at where the interpoles are placed: what part of the machine do they directly influence—the rotating armature, the commutator, or the main field? • When load current in the armature increases, what happens to the magnetic field inside the machine, and how could that affect the ideal brush position? • Which function would specifically help reduce sparking at the brushes when load changes, and which options describe unrelated functions like balancing or residual magnetism?

✅ Before You Answer

• Verify which option mentions brushes, neutral plane, or sparking, since interpoles are closely connected with commutation quality • Eliminate any choices that describe functions clearly handled by the main field poles (producing the main magnetic field) or by mechanical design (balancing, weight distribution) • Make sure the choice you pick directly connects the action of the interpoles to changing load/armature current and its effect on commutation