Electrical Machines
The shaft of induction motor may be unbalanced due to

  overheating of winding.
  overload.
  poor lubrication.
  uneven air gap.

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Electrical Machines
In a DC generator, the armature reaction results in

  demagnetization of leading & magnetization of trailing pole tip.
 demagnetization of centers of poles.
 magnetization of leading and demagnetization of trailing pole tip.
  magnetization of inter poles.

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