Speed the generator need to be driven to give an output of 240V D.C?

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dc2209
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1. The question is "what speed will the generator need to be driven to give an output of 240V D.C?" the generator is constructed using one pole pair having a sq surface of 6cm x 6cm and produces a flux of 18mWb. It has 4 commutator segments.
2. Possibly F = (P * N) / 120? I am not sure
3. F = (P * N) / 120 = (2*3000(dont know the number of turns this was a guess)?)/120 = 50
 
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