Which of the following motors will be used in electric clocks?
Correct answer: D. A.C. synchronous motor
- A. D.C. shunt motor
- B. D.C. series motor
- C. A.C. induction motor
- D. A.C. synchronous motor
Explanation
An AC synchronous motor runs at exactly synchronous speed, making it suitable for an electric clock where constant speed and accurate timekeeping are required. Induction-motor speed changes slightly with load because of slip.
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