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