Chemical Engineering MCQs

Page No. 686

Pick out the wrong statement ?


aAbsorption factor is constant, when the equilibrium and operating lines are straight


bIn case of a stripper, the equilibrium curve is always below the operating line


cIn case of an absorber, the operating line is always above the equilibrium curve


dIn the absorption of low solubility gases, the liquid film is the controlling resistance



In triangular co-ordinates, the ternary composition point falls ___________________ of the triangle?


aIn the corners


bInside


cOn the sides


dNone of these


View Answer Inside

Co-current absorbers are usually used when the gas to be dissolved in the liquid is ___________________?


aSparingly soluble


bHighly soluble


cA pure substance


dA mixture


View Answer A pure substance

When acetone is added in a two layer mixture of methyl isobutyl ketone and water at 30°C, the acetone distributes between the two layers and the composition of the layer follows two solubility curves. For this system ?


aAs the acetone concentration increases, the solubility curves approach each other


bBoth the phases become identical at a particular common point on both the solubility curves called the plait point


cThe distribution curve which is a plot between x (acetone concentration in one phase) and y (acetone concentration in other phase) is analogous to x-y curve used in distillation and absorption terminates on the x = y diagonal at the concentration of the plait point


dAll A., B. and C.


View Answer All A., B. and C.

Molecular sieves are regenerated by heating to ______________ °C?


a< 150


b200-330


c> 500


d> 1000


View Answer 200-330

Pick out the wrong statement. Generally for physical adsorption, a gas of________________?


aHigher molecular weight is adsorbed in preference to a gas of low molecular weight


bHigh critical temperature is adsorbed in preference to a gas of low critical temperature


cLow volatility is adsorbed in preference to a gas of high volatility


dNone of these


View Answer None of these

Which of the following processes is followed by unsaturated air (with dry bulb temperature 12°C and relative humidity 47%) passing through water spray washer (temperature of water being constant at 40°C ?


aHumidification only


bHeating only


cBoth heating and humidification


dEvaporative cooling



Which of the following is not fixed by the process requirements, in the design of absorbers ?


aFlow rate of the entering gas


bComposition of the entering liquid


cTerminal concentrations of gas stream


dNone of these


View Answer None of these

Reboiler is considered as one theoretical plate, because_____________________?


aOf the assumption that vapour and liquid leaving the reboiler are in equilibrium


bVapour is recycled to the column


cReboiler itself contains one plate


dNone of these



With increase in the mass velocity of the gas, the rate of drying during the constant rate period ______________, if the conduction and radiation through the solid are negligible ?


aIncreases


bDecreases


cRemain same


dIncreases linearly


View Answer Increases

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