For crane travel which of the following motors is normally used ?
Correct answer: D. AC. slip ring motor
- A. Synchronous motor
- B. D.C. differentially compound motor
- C. Ward-Leonard controlled D.C. shunt motor
- D. AC. slip ring motor
Explanation
Crane travel requires high starting torque and controlled acceleration, which are provided well by an AC slip-ring induction motor through external rotor resistance. Synchronous motors are unsuitable for frequent starting and speed changes.
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