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

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

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

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