Electrical Machines
In a DC series generator, the terminal voltage with increase in load will

 remain nearly constant
 decrease
 increase gradually and then stay at rated voltage
 increase to rated voltage and then may decrease

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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 in armature slots for compensation of the armature reaction.
 is located on commutating poles for improving commutation.

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