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

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Electrical Machines
DC Motor

  dc shunt with armature resistance control.
  dc shunt motor with field weakening.
  dc compound motor.
  dc series motor.

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