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The speed at which a four—pole alternator should be driven to generate 50 cycles per seconds is :

Question

The speed at which a four—pole alternator should be driven to generate 50 cycles per seconds is :

1,400 rpm

Solution

Given,

$P = 4, \quad f = 50\ \text{cycles/second} \\\\N_s = \frac{120f}{P} \\\\N_s = \frac{120 \times 50}{4} \\\\N_s = 1500\ \text{rpm}$

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