Electrical Machines
Autotransformer makes effective saving on copper and copper losses, when its transformation ratio is equal to

  very low
  approx to one.
  less than one.
  greater than one.

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Electrical Machines
The speed of a DC series motor is

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

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