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

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

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Electrical Machines
In a DC generator, the armature reaction results in

  magnetization of inter poles.
 magnetization of leading and demagnetization of trailing pole tip.
  demagnetization of leading & magnetization of trailing pole tip.
 demagnetization of centers of poles.

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