Discussion
If the load on a synchronous motor is increased beyond its pull-out value, the machine will
Answer: D
Correct answer: slip poles and lose synchronism
Beyond pull-out the torque angle passes 90 degrees, where the developed torque begins to fall as the angle grows while the load torque does not. The rotor cannot recover, falls back a pole pitch and then another, drawing heavy pulsating current and producing severe torque pulsations in the shaft. It cannot simply run slower, since torque exists only at synchronous speed, and the machine must be tripped and restarted.
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