1. 8838. Which of the following are the major parts of a DC motor? 1. Armature assembly. 2. Field assembly. 3. Brush assembly. 4. Commutator. 5. Pole piece. 6. Rheostat. 7. End frame. A. 1, 2, 3, 7. B. 2, 3, 4, 5 C. 3, 5, 6, 7.