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

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

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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