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

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

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Electrical Machines
The armature mmf of a DC machine has

  triangular space distribution and is stationary in space.
  triangular space distribution and rotates at the speed of armature.
  trapezoidal space distribution and is stationary in space.
 stepped distribution and rotates at the speed of armature.

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