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
Which of the following psychrometric processes is followed by water vapour laden unsaturated air, when it is passed through solid or liquid adsorbent?

Cooling and dehumidification
Dehumidification with dry bulb temperature remaining constant
Heating and dehumidification at almost constant wet bulb temperature
None of these

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Mass Transfer
Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 x 10⁻³ kg mole/m².s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m² .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is

5.6 x 10⁻³
8.5 x 10⁻⁴
5.6 x 10⁻⁴
8.5 x 10⁻³

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