Electrical Machines
Which of following DC generator will be in a position to build up without any residual magnetism in the field?

  Series.
  Separately excited.
  Compound.
 Shunt.

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

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

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