Discussion
The ratio of maximum torque to full-load torque of a cage induction machine is typically
Answer: C
Correct answer: between two and three
The breakdown torque of a general purpose cage machine is two to three times its full-load value, and the margin matters: it is what allows the machine to ride through a momentary overload or a voltage dip without stalling. Since torque falls as the square of voltage, a dip to seventy per cent already halves the available torque.
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