Mass Transfer Questions And Answers.
Exercise ::
Mass Transfer
1. During the constant rate period of drying of a solid ?
A. Increased air humidity decreases the rate of drying B. Increasing the air temperature decreases the drying rate C. Surface evaporation of unbound moisture occurs D. None of these
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2. Humidification involves mass transfer between a pure liquid phase and a fixed gas, which is__?
A. Insoluble in the liquid B. Soluble in the liquid C. Non-ideal in nature D. At a fixed temperature
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3. The mass transfer co-efficient for a solid sphere of radius �a� dissolving in a large volume of quiescent liquid, in which �D� is the diffusivity of solute, is _?
A. D/a B. D/2a C. Proportional to ?D D. Dependent on the Reynolds number
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4. Cox chart, which is useful in the design of distillation column particularly for petroleum hydrocarbons, is a plot of (where, P = vapor pressure, T = temperature) ?
A. log P vs. T B. log P vs. log T C. T vs. P D. P vs. log T
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5. The commonly used solvent in supercritical extraction is____?
A. Methyl ethyl ketone B. Water C. Carbon tetrachloride D. Carbon dioxide
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