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1. |
If a machine has P poles and the armature rotates at N revolutions per minute, then the frequency of induced emf in the armature winding of the machine is: |
A. | \(f = \frac{{50}}{{PN}}Hz\) |
B. | \(f = \frac{{120}}{{PN}}Hz\) |
C. | \(f = \frac{{PN}}{{120}}Hz\) |
D. | \(f = \frac{{PN}}{{50}}Hz\) |
Answer» D. \(f = \frac{{PN}}{{50}}Hz\) | |