Trommels are revolving screens which normally operate in the range of _______________ rpm?
Correct answer: B. 15 - 20
- A. 1 - 2
- B. 15 - 20
- C. 40 - 50
- D. 60 - 75
Explanation
Trommels rotate slowly so that particles are lifted and then cascade through the cylindrical screen; their usual speed is about 15 to 20 rpm. Higher speeds can cause excessive centrifugal carrying of the material.
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