Mass Transfer
For water-ethanol system, the minimum reflux ratio

Cannot be computed
Is computed from the slope of the upper operating line that is tangent to the equilibrium curve
Is the optimum reflux ratio
Is computed from the intercept of the operating line

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Mass Transfer
In case of a desorber (stripper), the

Temperature remains unaffected
Operating line always lies above the equilibrium curve
Temperature always increases
Operating line always lies below the equilibrium curve

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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?

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

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