Length to diameter ratio of most rotary driers is in the range of____________________?
Correct answer: B. 4 to 10
- A. 1 to 2
- B. 4 to 10
- C. 10 to 20
- D. 20 to 30
Explanation
Rotary dryers are generally long, slowly rotating cylinders, with length-to-diameter ratios commonly around 4 to 10. Smaller ratios provide insufficient residence length, while much larger ratios are less practical mechanically.
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