Electrical Machines
Magnetic field of a DC generator is produced by what?

 None of the options.
 Both B and C.
 Permanent magnets.
  Electromagnets.

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

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