Electrical Machines
Which of the following motor has negative speed regulation?

 Cumulative compound motors
 Shunt motor
 Series motor
 Differential compound motor

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Electrical Machines
The mmf produced by rotor currents of a 3 - Φ induction motor

  rotates at slip speed with respect to stator mmf.
  rotates at synchronous speed with respect to rotor.
  is at standstill with respect to stator mmf.
  rotates at the speed of rotor in the air gap.

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