Electrical Machines
In which of the following DC Motor the ratio of starting torque to full load torque is minimum?

  Differential compound motor.
  Cumulative compound motor.
  Series motor.
  Shunt motor.

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

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

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