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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Electrical Machines
Which of the following represents the commutator pitch?

 Number of conductors spanned by one coil at the back end of the armature.
 The distance between the staring of first coil and its next successive coil
 Number of conductors spanned by one coil at the front end of the armature.
 Number of commutator segments between two successive coils.

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