Electrical Machines
If an additional resistance is connected in series with a DC motor operating at rated speed, the speed of the motor will

  Oscillate around the normal speed.
  Increase.
  Reduce.
  Remain unaltered.

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

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

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