Synchronous Motors
Change of D.C. excitation of a synchronous motor changes

Motor speed
Applied voltage of the motor
Power factor of power drawn by the motor
Any of the above

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Synchronous Motors
As the load is applied to a synchronous motor, the motor takes more armature current because

The rotor strengthens the rotating field causing more motor current
The increased load has to take more current
The back e.m.f. decreases causing an increase in motor current
The rotor by shifting its phase backward causes motor to take more current

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