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

 differential compound.
 shunt.
 series.
 cumulative compound.

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Electrical Machines
In a DC machine the armature mmf is

  stationary with respect to field poles.
 rotating with respect to field poles.
  stationary with respect to armature.
  rotating with respect to field poles as well as armature.

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