Electrical Machines
Variation in speed by ward-Leonard control of DC motors occurs due to variation in

  Supply voltage.
  Field excitaion.
  Armature voltage.
  Armature current.

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Electrical Machines
With the increase in speed of DC motor

 Both back emf as well as line current fall.
  Back emf increase but line current falls.
 Back emf falls and line current increase.
 Both back emf as well as line current increase.

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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.
  are provided on the stator for improving power factor.
  consists of short-circuited copper bars embedded in the field pole faces.
  both (A) and (B).

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