Electrical Machines
Speed of DC motor can be controlled by varying

 all of these.
 its flux oer pole.
 resistance of armature culture.
 applied voltage.

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

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