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

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

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Electrical Machines
Due to magnetic saturation, the flux per pole in a DC machine without brush shift

  decreases in both generators and the motors with load.
 decreases in generators and increases in motor with load.
 increases in both the generators and the motors with load.
 increases in generators but decreases in motor with load.

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