Discussion
The differential cascade connection of those two machines gives a speed of
Answer: D
Correct answer: 3,000 rpm
In differential cascade the pole numbers subtract: \[ N_s = \frac{120 \times 50}{|4 - 6|} = \frac{6000}{2} = 3000\ \mathrm{rpm}. \] The negative sign means the second machine’s field opposes, and the set behaves as a two-pole machine. Cascade connection thus offers four speeds - either machine alone, and the two combinations.
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