The retention time of material in a rotary dryer depends upon its ______________________?
Correct answer: D. All A., B. and C.
- A. rpm
- B. Slope & length
- C. Flights arrangement
- D. All A., B. and C.
Explanation
Material stays longer when the dryer rotates more slowly, is longer or more steeply inclined, and has flights that reduce its conveying rate. Thus rpm, slope and length, and flight arrangement all affect retention time.
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