Pick out the wrong statement pertaining to the rotary dryer.
A. Flights (located in the inside shell of rotary dryer) lift the material being dried and shower it down through the current of hot air/gases. It extends from the wall to a distance which is about 8-12% of the inside diameter of shell
B. Hold up of a rotary drier is defined as the fraction of the dryer volume occupied by the solid at any instant. The best performance for rotary drier is obtained, when the hold up is in the range of 0.05 to 0.15
C. Rotary dryer is suitable for drying sticky material
D. Recommended peripherial speed of a rotary drier is in the range of 10 to 30 metres/minute
Answer: Option C
This Question Belongs to Chemical Engineering >> Mass Transfer
A. Chemical properties
B. Physical properties
C. Degree of turbulence
D. Interfacial area
A. No change in theoretical
B. Marginal decrease in the number of
C. Major decrease in the number of
D. None of these
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