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

Spray
None of these
Freeze
Indirect tray

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Mass Transfer
McCabe-Thiele method

Uses weight fractions to express liquid and vapour composition
Is more accurate than Ponchan-Savarit method
Can use any type of units
Uses molal units for material and energy balance

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Mass Transfer
The term "approach" in a cooling tower refers to the difference in the temperature of the

Cold water leaving the tower and the wet bulb temperature of the surrounding air
Hot water entering and the cooled water leaving the cooling tower
None of these
Hot water entering the tower and the wet bulb temperature of the surrounding air

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