Which of the following methods is easily applicable to control the speed of the squirrel-cage induction motor _____________?
Correct answer: A. By changing the number of stator poles
- 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
Explanation
Changing the number of stator poles changes synchronous speed and is readily implemented in a squirrel-cage motor. Rotor rheostat and rotor e.m.f. injection require access to the rotor circuit, which a squirrel-cage rotor does not provide.
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