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A centre zero ammeter connected in the rotor circuit of a 6-pole, 50 Hz induction motor makes 30 oscillations in one minute. The rotor speed is | |
A. | 970 rpm. [Wrong Answer] |
B. | 990 rpm [Correct Answer] |
C. | 1010 rpm. [Wrong Answer] |
D. | 1030 rpm [Wrong Answer] |