Electrical Machines
Synchronising power of a synchronous motor varies

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

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Electrical Machines
With the increase in speed of a DC motor

 back emf falls and line current increases.
 both back emf as well as line current fall.
 back emf increases but line current falls.
 both back emf as well as line current increase.

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