Mass Transfer
To get high tray efficiency

Time of contact between the two phases should be less
Interfacial surface between liquid and gas phase should be large
Liquid entrainment should be severe
Gas velocity should be very low

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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?

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

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Mass Transfer
If a two phase system is in physical equilibrium; then it means that, the

Temperature of the liquid phase is equal to that of the vapor phase
Escaping tendency of each component from the liquid phase to the vapor phase is exactly equal to that from vapor phase to liquid phase
All of these
Total pressure throughout the liquid phase is equal to that throughout the vapor phase

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