In a synchronous motor, the breakdown torque is__________?
Correct answer: B. directly proportional to applied voltage
- A. directly proportional to the square of the applied voltage
- B. directly proportional to applied voltage
- C. inversely proportional to applied voltage
- D. none of the above
Explanation
The breakdown or pull-out torque corresponds to the maximum power angle and is proportional to EV/Xs. With excitation and reactance fixed, E is fixed, so it varies directly with the applied voltage rather than with its square.
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