Electrical Machines
For higher values of armature, the speed of a DC series motor is

 Proportional to the square of armature current.
  Constant.
 Proportional to armature current.
 Inversely proportional to armature current.

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Electrical Machines
For an ideal transformer the winding should have

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

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