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A 3 phase induction motor is controlled by voltage and frequency control such that the ratio V/f is constant. At 50 Hz, the speed is 1440 rpm. At 25 Hz, the speed is likely to be | |
A. | about 1350 rpm [Wrong Answer] |
B. | about 720 rpm [Correct Answer] |
C. | about 360 rpm [Wrong Answer] |
D. | either (b) or (c) [Wrong Answer] |
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