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

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

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Electrical Machines
Two dc machines A and B, using the same conductor material, have armature circuit resistances of 0.4 Ω and 1.2 Ω respectively. Of the two machines,

 both are of the same size for the same current rating
 A is bigger than B for the same voltage rating
 B is bigger than A for the same current rating
 A is bigger than B for the same current rating

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