In a DC machine, the armature is always on the rotor unlike an AC machine where it could be either on the stator or the rotor, because
A. commutation would otherwise not be possible.
B. armature reaction demagnetizing action would otherwise be more.
C. otherwise it would not be possible to place compensating winding in pole shoes.
D. self-starting of DC motor would not be possible otherwise.
Answer:A
In a DC machine, the armature is always on the rotor unlike an AC machine where it could be either on the stator or the rotor, because
A. commutation would otherwise not be possible. B. armature reaction demagnetizing action would otherwise be more. C. otherwise it would not be possible to place compensating winding in pole shoes. D. self-starting of DC motor would not be possible otherwise.