Mass Transfer
Which of the following is used for the concentration of rubber latex?

Calendria
Long tube vertical evaporator
Agitated film evaporator
Short tube evaporator

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Mass Transfer
Molecular diffusion is caused by the

Potential energy of the molecules
Activation energy of the molecules
Transfer of molecules from low concentration to high concentration region
Thermal energy of the molecules

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

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

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

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

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