Electrical Machines
Under which of the following conditions hunting of synchronous motor is likely to occur ?

  Periodic variation of load.
  Small and constant load.
  Over-loading for long period.
  Over-excitation.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

 compensate for the decrease in speed due to increase of load.
 reduce eddy current losses by providing local short circuits.
  neutralize voltage induced in coil due to fluctuation of l
None of these

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