Discussion
Match the torque with its definition.
1. Pull-in torque 2. Pull-out torque 3. Starting torque
P. Beyond which synchronism is lost Q. Developed on the damper winding at standstill R. At which the machine locks into step
Answer: A
Correct answer: 1-R, 2-P, 3-Q
Three torques belonging to three stages. Starting torque is what the damper winding develops at standstill. Pull-in torque is the load against which the machine can be locked into step as the field is applied. And pull-out torque is the load beyond which synchronism is lost, corresponding to a load angle of ninety degrees.
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