Synchronous Motors
Hunting in a synchronous motor can not be due to

Variable supply frequency
Variable frequency
Windage friction
Variable load

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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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