### Q.In a dc machine the armature mmf is

• AStationary with respect to the field poles but rotating with respect to the armature
• BRotating with respect to field poles as well as armature
• CRotating with respect to field poles
• DStationary with respect to armature
Correct Answer : (A)

Stationary with respect to the field poles but rotating with respect to the armature

Hints :

In a dc machine the armature mmf is Stationary with respect to the field poles but rotating with respect to the armature.

Torque developed in an electromechanical energy conversion device depends upon

In electromechanical energy conversion devices (e.g generators and motors) a small air gap is left between the stator and the rotor in order to