Electrical Machines
Ward-Leonard system for controlling the speed of a DC motor is used where

 All of above.
 The accuracy in speed control is required.
 The speed in both the direction is required.
 Very fine speed control over the whole range from zero to normal speed is required.

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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
 minimum resistance on primary side and maximum resistance on secondary side
 equal resistance on primary and secondary side

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