Electrical Machines
Synchronising power of a synchronous motor varies

 inversely as 1/Xs
 directly as Xs2
All of these
 directly as synchronous reactances Xs

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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

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

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