For three-phase induction motors which of the following is the least efficient method of speed control ?

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📊 Control of Electric Drives

Q. For three-phase induction motors which of the following is the least efficient method of speed control ?

(A) Cascade control
(B) Pole changing
(C) Rheostatic control
(D) Combination of cascade and pole changing

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✅ Correct Answer: (C) Rheostatic control

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