Electrical Machines
In a loaded DC generator, if the brushes are given a shift from the interpolar axis in the direction of rotation, then the commutation will

 improve with fall of terminal voltage.
 improve with rise in terminal voltage.
 deteriorate with fall of terminal voltage.
 deteriorate with rise in terminal voltage.

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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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