Electrical Machines
In a DC generator the actual flux distribution depends upon

  all of above.
  clearance between tips of the adjacent pole shoes.
  shape of the pole shoe.
 size of air gap.

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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 stator circuit.
 Connecting an additional resistance in the armature circuit.

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