Electrical Machines
In dc machines, the armature windings are placed on the rotor because of the necessity for

 development of torque
 generation of voltage
 electromechanical energy conversion
 commutation

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Electrical Machines
In a synchronous motor when the rotor speed exceeds the synchronous speed during hunting

  the damper bars develop induction motor torque.
  the damper bars develop synchronous motor torque.
  the damper bars develop induction generator torque.
  negative sequence currents are generated.

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Electrical Machines
For a given torque, reducing diverter resistance of a DC series motor causes

 increase in speed demanding more armature current.
 decrease in speed demanding less armature current.
 decrease in speed but armature current remains the same.
 increase in speed but armature currnet remains the same.

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