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

None of these
Freeze
Indirect tray
Spray

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Mass Transfer
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)

Decreases pressure drop, increases surface area
Increases pressure drop, decreases surface area
Decreases pressure drop, decreases surface area
Increases pressure drop, increases surface area

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