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Q. |
Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor ? |
A. | By changing the number of stator poles |
B. | Rotor rheostat control |
C. | By operating two motors in cascade |
D. | By injecting e.m.f. in the rotor circuit |
Answer» A. By changing the number of stator poles |
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