Electrical Machines
The dc motor which can provide zero speed regulation at full load without any controller, is

 cumulative compound.
 differential compound.
 series.
 shunt.

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

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

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