Electrical Machines
Semi closed slots or totally closed slots are used in induction motors, essentially to

 reduce magnetising current and improve power factor
 increase pull out torque
 improve starting torque
 decrease starting torque

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Electrical Machines
For an ideal transformer the winding should have

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

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