Electrical Machines
An IM cannot run at synchronous speed because

  induction motor will become synchronous motor.
  none of above.
  rotor torque will not be produced.
  air friction will prevent it.

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Electrical Machines
The speed of a DC series motor is

 Proportional to field current.
 Proportional to the armature current.
 Inversely proportional to the armature current.
 Proportional to the square of the armature current.

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