Synchronous Motors
The rotor of synchronous motor is excited with direct current when the motor _____

None of the listed here
Approches synchronous speed
Approches half synchronous speed
Is at standstill

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

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