Q. Satisfactory commutation of D.C. machines requires (Solved)
1. brushes should be of proper grade and size
2. brushes should smoothly run in the holders
3. smooth, concentric commutator properly undercut
4. all of the above
- d. all of the above
1. brushes should be of proper grade and size
2. brushes should smoothly run in the holders
3. smooth, concentric commutator properly undercut
4. all of the above