Power Systems
The only place where slip ring induction motors used in thermal power plants is

  lubrication oil pumps.
  coal handling plant.
  none of above.
  conveyors.

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Power Systems
The skin effect shows that

 current density is lower at the surface of the condutor
 current density is more at the centre of the condutor
 the distribution of AC current is uniform through the cross section of the conductor
 current density is more at the surface of the condutor

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