Synchronous Motors
Leading power factor synchronous motors cost ______ the unity pf motors.

Less than
None of the listed here
About the same as
More than

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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

induction motor torque in damper winding
induction motor torque in field winding
eddy current and hysteresis torque in pole faces
All of the listed here

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