Electrical Machines
Torque angle of a synchorous machine operating from a constant voltage bus is usually defined as the space angle between

  Rotor mmf wave and stator mmf wave.
 Rotor mmf wave and resultant flux density wave.
 Stator mmf wave and resultant flux density.
 Stator mmf wave and resultant mmf wave.

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to armature.
  rotating with respect to field poles as well as armature.
  stationary with respect to field poles.
 rotating with respect to field poles.

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