Discussion
For two cascaded induction machines of \( P_1 \) and \( P_2 \) poles in cumulative connection, the synchronous speed is
Answer: B
The two machines behave as one with the poles added, so a four-pole and a six-pole pair on 50 Hz runs at 600 rpm. Reversing the phase sequence to the second machine gives the differential connection and a different speed.
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