Discussion
The moment at which the field is applied during induction starting should be
Answer: A
Correct answer: near synchronous speed with the poles favourably placed
The machine is accelerated as an induction motor to just below synchronous speed, and the field is then applied at the moment the rotor poles are approaching alignment with the stator field, so that the machine is pulled into step with the smallest disturbance. Applying it at standstill or at half speed produces alternating torques and no pull-in, and above synchronous speed the machine would be generating rather than motoring.
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