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

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

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Synchronous Motors
While starting a salient pole synchronous motor by induction motor action and connecting field discharge resistance across field, starting and accelerting torque is produced by

All of the listed here
induction motor torque in field winding
induction motor torque in damper winding
eddy current and hysteresis torque in pole faces

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