Electrical Machines
Tap changer is generally provided in

  power transformer.
 earthing transformer.
 current transformer.
 voltage transformer.

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

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