Test: Mass Transfer - 8 - Chemical Engineering MCQ
25 Questions MCQ Test - Test: Mass Transfer - 8
Which of the following is an undesirable property in a tower packing ?
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.
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A 25 cm x 25 cm x 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m x 1m x 1cm flat sheet of the same material is to be dried from one side only.Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is
Water entrained by circulating air in cooling towers is termed as
With increase in temperature, the rate of leaching increases, because the
The Kundsen diffusivity is proportional to (where, T = absolute temperature)
In case of constant underflow extraction operation, the __________ at all solute concentration.
In an absorption coloumn, the flooding velocity for random packing is __________ that for stacked/regular packing.
The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp = M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force.)
With increase in temperature, the leaching rate increases because of the
During constant rate period, the rate of drying decreases with the
The fixed cost of a distillation column at minimum reflux ratio is
__________ extractor uses centrifugal force for separating the two phases.
In a binary distillation column, if the feed contains 40 mole % vapour, the q line will have a slope of
Acetic acid will be most economically separated from a dilute solution of acetic acid in water by
Design calculation for multiple component distillation is done by
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
Pick out the wrong statement. Generally for physical adsorption, a gas of
In most of the mechanically agitated liquid-liquid extractors, baffles or horizontal compartmental plates are provided, which helps in
In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as
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