Which of the following motors is preferred for boom hoist of a travelling crane ?
Correct answer: C. A.C. slip ring motor
- A. Single phase motor
- B. Synchronous motor
- C. A.C. slip ring motor
- D. Ward-Leonard controlled D.C. shunt motor
Explanation
A slip-ring induction motor provides high starting torque and allows useful speed control by adding resistance to the rotor circuit, making it suitable for crane boom-hoist duty. A squirrel-cage motor has less flexible starting control.
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