Induction machine

A 25 hp, 8-pole, 50 Hz, 230 V IM is connected in cascade with another 30 hp, 12-pole, 50 Hz, 230 V motor. What are the possible speeds with the combination and what is the maximum load in HP which may be delivered without overload in either machines?

(a) 1000 rpm, 500 rpm, 750 rpm, 600 rpm, 25 HP

(b) 750 rpm, 1200 rpm, 1400 rpm, 1500 rpm, 30 HP

© 500 rpm, 750 rpm, 300 rpm, 1500 rpm, 30 HP

(d) 600 rpm, 3000 rpm, 1500 rpm, 2500 rpm, 25 HP

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