Power Systems
Which of following is a medium and low head turbines

  Francis and Kaplan turbines.
  None of above.
  Kaplan and Francis turbines.
  Pelton and Kaplan turbines.

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Power Systems
The skin effect shows that

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

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