Electrical Machines
For satisfactory parallel operation of two transformers which of the following conditions is most essential,

 percentage impedance of all transformers must be same.
 MVA rating of all transformer inversely proportional to impedance.
  polarities of all transformers must be same.
 voltage ratio of all transformers must be same.

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Electrical Machines
With the increase in speed of a DC motor

 both back emf as well as line current increase.
 back emf increases but line current falls.
 both back emf as well as line current fall.
 back emf falls and line current increases.

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