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The speed of a 4-pole induction motor is controlled by varying the supply frequency while maintaining the ratio of supply voltage to supply frequency (V/f) constant. At rated frequency of 50 Hz and rated voltage of 400 V its speed is 1,440 rpm. Find the speed at 30 Hz, if the load torque is constant. | |
A. | 882 rpm. [Wrong Answer] |
B. | 864 rpm. [Wrong Answer] |
C. | 840 rpm [Correct Answer] |
D. | 828 rpm. [Wrong Answer] |