Optimum ratio of operating speed to critical speed of a trommel is_____________________?
Correct answer: A. 0.33-0.45
- A. 0.33-0.45
- B. 1.33-1.45
- C. 0.5-2
- D. 1.5-2.5
Explanation
A trommel is normally operated well below its critical speed, with the operating-to-critical speed ratio commonly about 0.33 to 0.45. Higher ratios can cause the material to ride with the rotating screen instead of tumbling and screening properly.
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