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Statement 1: Vibro-fluidized bed dryer can reduce the air flow rate consumptions as air is only used for drying and not for fluidizing.

Statement 2:  _____ are often called desolventizers.

(a) True, screw conveyor

(b) True, pneumatic conveyor

(c) False, screw conveyor

(d) False, pneumatic conveyor

I have been asked this question during an interview.

This intriguing question comes from Unit Operations topic in chapter Heat Transfer Equipment, Microwave Heating, Evaporation, Diffusion and Mass Transfer and Dehydration of Food Engineering

1 Answer

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The correct option is (a) True, screw conveyor

Easiest explanation: Vibro-fluidized bed dryer can reduce the air flow rate consumptions as air is only used for drying and not for fluidizing. Mechanical vibratory motion is used for fluidization. Screw conveyors are often called desolventizers because the main purpose is to remove the solvent from the pastes and not to recover it.

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