If a d.c. motor is disconnected from the source and armature circuit is short circuited through a suitable resistance, the process is called (a) regenerative breaking (b) rheostatic breaking (c) dynamic breaking (d) no breaking is possible
If a d.c. motor is disconnected from the source and armature circuit is short circuited through a suitable resistance, the process is called rheostatic breaking because the kinetic energy of the rotor is dissipated in terms of heat and it is not utilized anywhere else. Since the kinetic energy tends to become zero, breaking action occurs.