Electrical Machines
Addition of 0.3 % to 4.5 % silicon to iron

  increases the electrical resistivity of iron.
  reduces the saturation magnetization.
None of these
  increases the hysteresis loss.

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Electrical Machines
In large sized DC machines the compensating windings are provided to

 reduce eddy current losses by providing local short circuits.
  neutralize voltage induced in coil due to fluctuation of l
 compensate for the decrease in speed due to increase of load.
None of these

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Electrical Machines
In speed control of DC Series motor, speed lower than the rated speed can be obtained by

 Connecting an additional resistance in the armature circuit.
 Connecting an additional resistance in stator circuit.
 Any of the above.
 Connecting an additional resistance in the field circuit.

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