Mass Transfer
Heat sensitive materials like certain pharmaceuticals and food stuffs can be dried in a/an __________ dryer.

Spray
Indirect tray
Freeze
None of these

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Mass Transfer
The McCabe Δ L law states that the

Linear crystal growth rate depends on the crystal size
Linear crystal growth rate does not depend on the crystal size
Linear crystal growth rate depends on the degree of supersaturation
Molar heats of vaporisation of components are nearly equal

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Mass Transfer
At equilibrium the concentration of water in vapour phase (C*)in kg/m³ of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m³ containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is

0.4
0.2
1

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Mass Transfer
When the solvent dissolves very little of solute, then

Very small quantity of solvent is required
Solvent of low freezing point should be used
Large quantity of solvent is required to extract the solute
Solvent of low latent heat of vaporisation should be used

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