Electrical Machines
Which of the following DC motors has almost constant speed over their full load range?

 Series.
  Shunt.
 Compound (cummolative).
 none of these.

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

  rotates at the speed of rotor in the air gap.
  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.

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