Electrical Machines
The compensating winding in a DC machine

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

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Electrical Machines
Consider the following statements regarding dc machines : 1. possible resistance of shunt-field winding is 1 Ω 2. possible resistance of series-field winding is 1 Ω 3. electrographite brushes are used for 230 V, 10 A machines 4. Copper-graphite brushes are used for 230 V, 10 A machines 5. Possible armature-circuit resistance is 1 Ω From these, the correct statements are

 1, 3, 5
 1, 4
 2, 3 , 5
 2, 4 ,5

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