Electrical Machines
In V/f speed control of 3-phase induction motor, with increase in frequency, the slip at which maximum torque occurs

 either of these.
 increase.
None of these
 decrease.

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

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

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