Electrical Machines
In DC machine, the armature windings are placed on the rotor because of necessity for

 development of torque.
 electromechanical energy conversion.
 generation of voltage.
 commutation.

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Electrical Machines
Slip speed is the

  sum of synchronous and rotor speeds.
  difference of actual rotor speed and synchronous speed.
  half of the sum of synchronous and rotor speeds.
  difference of synchronous speed and actual rotor speed.

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