Electrical Machines
In synchronous motor, the damper winding is generally used to

  provide starting torque only.
  reduce noise level only.
  prevent hunting and provide the starting torque.
  reduce the eddy currents.

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Electrical Machines
In a DC machine the armature mmf is

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

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