Electrical Machines
When operating, two or more transformers in parallel, % impedance of these transformers should be

  same.
 inversely proportional to MVA rating of transformers.
 such that actual impedance of all transformers would be same.
 proportionate to MVA rating of transformers.

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Electrical Machines
The compensating winding in a DC machine

  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.
  is located on pole shoes for avoiding the flashover at the commutator.

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