Mass Transfer
Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the __________ moisture.

Critical
Bound
Unbound
Free

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

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Mass Transfer
Molecular diffusion is caused by the

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

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