Electrical Machines
Which of the following is done in speed control of DC motor by field flux control?

 Inserting resistance to armature circuit and field circuit.
 Any of above.
 Inserting an additional resistance in the armature circuit.
 Inserting an additional resistance in the field circuit.

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Electrical Machines
DC Motor

  dc shunt with armature resistance control.
  dc compound motor.
  dc series motor.
  dc shunt motor with field weakening.

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