Synchronous Motors
Synchronous motors are generally used in application requiring _______

Frequent stopping
Sudden application of heavy loads
Infrequent starting
Variable speed

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

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