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

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

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Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Inserting resistance to armature circuit and field circuit.
 Inserting an additional resistance in the field circuit.
 Inserting an additional resistance in the armature circuit.
 Any of above.

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Electrical Machines
With the increase in speed of a DC motor

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

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