Synchronous Motors
An important advantage of a synchronous motor over wound round induction motor is that

its speed may be controlled more easily
its power factor may be varied at will
None of these
its speed is independent of supply frequency

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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
eddy current and hysteresis torque in pole faces
induction motor torque in field winding
induction motor torque in damper winding

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