SOLUTION

In repulsion motor, the brushes on the rotor are short-circuited with each other through a low resistance conductor called Jumper. There is no electrical connection to the rotor, unlike the rotor connection in a dc machine. A set of brushes makes contact with the surface of the commutator bars. The entire assembly looks very much like a DC armature and brush assembly. One difference, however, is that the brushes of the repulsion motor are shorted together. Their function is to provide a current path through certain parts of the armature, not to provide power to the armature from an external source.