Synchronous Motors
A synchronous motor runs at only one speed because it ______

Has a damper winding
Is a doubly fed machine
Has no losses
None of the listed here

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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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