Which D.C. motor is preferred for elevators ?
Correct answer: D. Cumulative compound motor
- A. Shunt motor
- B. Series motor
- C. Differential compound motor
- D. Cumulative compound motor
Explanation
Elevators require high starting torque and reasonably controlled speed, which is provided by the series-field torque of a cumulative compound motor. The shunt field also prevents the excessive speed variation of a pure series motor.
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