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

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Electrical Machines
In a DC machine

 current and emf at the terminals are alternating.
 emf in armature conductors and at the terminals is alternating.
 current and emf in armature are alternating.
 current and emf in armature are unidirectional

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