Electrical Machines
The speed of a DC series motor is

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

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

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Electrical Machines
Flashing the field of DC generator means

  creating residual magnetism by a DC source.
  neutralising residual magnetism.
 increasing flux density by adding extra turns of winding.
  making the magnetic losses forces parallel.

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