For derries and winches which of the following drives can be used ?
Correct answer: D. Any of the above
- A. Pole changing squirrel cage motors
- B. D.C. motors with Ward-leonard con-trol
- C. A.C. slip ring motors with variable resistance
- D. Any of the above
Explanation
Derricks and winches require high starting torque and controllable speed, which can be provided by pole-changing motors, Ward-Leonard DC drives, or slip-ring motors with external resistance. Hence, all the listed drive arrangements are possible.
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