Electrical Machines
Ratio of starting torque to full load torque is minimum in

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

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Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Increase in speed but armature currnet remains the same.
  Decrease in speed demanding less armature current.
  Decrease in speed but armature current remains the same.
  Increase in speed demanding more armature current.

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