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

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

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

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

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current fall.
 back emf falls and line current increases.
 back emf increases but line current falls.
 both back emf as well as line current increase.

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