Electrical Machines
In a synchronous motor hunting can be reduced to minimum possible by

  designing the motor for adequate synchronizing power.
  using a flywheel.
  providing damper winding in the rotor pole faces.
  any of above methods.

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Electrical Machines
The damper windings also called the squirrel cage windings or damper grids

  are provided in a synchronous motor to make it self starting.
  both (A) and (B).
  consists of short-circuited copper bars embedded in the field pole faces.
  are provided on the stator for improving power factor.

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Electrical Machines
In a DC machine

 current and emf in armature are alternating.
 current and emf at the terminals are alternating.
 current and emf in armature are unidirectional
 emf in armature conductors and at the terminals is alternating.

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