Electrical Machines
What is the speed of stator rotating magnetic field with respect to rotor rotating magnetic field?

 Synchronous speed
 Zero
None of these
 Slip speed

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

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

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