Discussion
The pull-in torque of a synchronous motor is the torque
Answer: A
Correct answer: at which it can be brought into synchronism from near synchronous speed
Pull-in torque governs the last step of starting: the machine has been brought close to synchronous speed on its damper winding, and the field is then applied to lock it into step. If the load torque exceeds the pull-in value the rotor cannot be captured, and the machine continues to slip.
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