Electrical Machines
The armature of DC machine is made of silicon steel lamination to

 reduce eddy current loss only.
 reduce hysteresis loss only.
 reduce both eddy current and hysteresis loss.
 increase the permeability.

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Electrical Machines
Two of supply terminals to a 3 - Φ induction motor get interchanged during re-connection after normal maintenance. When switched on the supply, the motor will

  get heated and damaged.
  rotate in the same direction as before maintenance.
  not start at all.
  rotate in direction opposite to that before maintenance.

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