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

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

ANSWER DOWNLOAD EXAMIANS APP

Electrical Machines
For a given torque, reducing divertor resistance of a DC series motor

  Decrease in speed but armature current remains the same.
  Decrease in speed demanding less armature current.
  Increase in speed demanding more armature current.
  Increase in speed but armature currnet remains the same.

ANSWER DOWNLOAD EXAMIANS APP