Electrical Machines
On switching a DC motor to DC supply mains, it is found to rotate in the direction opposite to that for which it is designed. The DC motor is

  Differentical compound.
 Series shunt.
 have an equal number of electrons and protons.
 Cummulative compound.

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Electrical Machines
The compensating winding in a DC machine

  is located on pole shoes for avoiding the flashover at the commutator.
  is located on pole shoes to avoid the sparking at the brushes.
 is located on commutating poles for improving commutation.
 is located in armature slots for compensation of the armature reaction.

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