Electrical Machines
The armature core of a DC machine is laminated to minimise

 temperature rise
 mechanical loss
 eddy-current loss
 hysteresis loss

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Electrical Machines
Slip speed is the

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

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