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For a practical synchronous motor, the pull-out torque will occur when the torque angle is nearly equal to ________

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For a practical synchronous motor, the pull-out torque will occur when the torque angle is nearly equal to ________

(a) 0°

(b) 30°

(c) 45°

(d) 75°

I have been asked this question during an interview.

Asked question is from DC Motors in division Characteristics of DC & AC Motors of Electric Drives

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Right answer is (d) 75°

Best explanation: In a practical synchronous motor, the armature resistance cannot be neglected and hence the pull-out occurs at delta=beta which is the impedance angle and is practically 75°.

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