Rotor rheostat control method of speed control is used for____________?
Correct answer: B. slip ring induction motors only
- A. squirrel-cage induction motors only
- B. slip ring induction motors only
- C. both A. and (b)
- D. none of the above
Explanation
A rotor rheostat must be connected to the rotor circuit, which is accessible only in a slip-ring induction motor. The rotor bars of a squirrel-cage motor are permanently short-circuited and cannot accept external resistance.
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