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

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

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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?

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

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