Electrical Machines
Induction motors normally use cast aluminium rotor because aluminium is

  lighter in weight.
  cheaper in cost.
  easy to cast owing to its low melting point and is easily available.
  of low resistivity.

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Electrical Machines
For an ideal transformer the winding should have

 equal resistance on primary and secondary side
 maximum resistance on primary side and least resistance on secondary side
 no ohmic resistance on either side
 minimum resistance on primary side and maximum resistance on secondary side

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