Electrical Machines
The speed of a DC series motor is

 Proportional to field current.
 Proportional to the square of the armature current.
 Proportional to the armature current.
 Inversely proportional to the armature current.

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

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