McqMate
Q. |
The injected e.m.f. in the rotor of induction motor must have |
A. | zero frequency |
B. | the same frequency as the slip fre-quency |
C. | the same phase as the rotor e.m.f. |
D. | high value for the satisfactory speed control |
Answer» B. the same frequency as the slip fre-quency |
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