Mass Transfer
Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of __________ humidity.

Percentage
Relative
None of these
Molal

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

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

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