Chemical Engineering MCQs

Page No. 686

Pick out the wrong statement ?


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

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

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

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

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


aIn the corners

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bInside

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cOn the sides

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dNone of these

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View Answer Inside

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


aSparingly soluble

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bHighly soluble

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cA pure substance

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dA mixture

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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

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

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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

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dAll A., B. and C.

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View Answer All A., B. and C.

Molecular sieves are regenerated by heating to ______________ °C?


a< 150

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b200-330

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c> 500

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d> 1000

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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

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

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

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dNone of these

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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

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bHeating only

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cBoth heating and humidification

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dEvaporative cooling

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


aFlow rate of the entering gas

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bComposition of the entering liquid

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cTerminal concentrations of gas stream

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dNone of these

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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

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bVapour is recycled to the column

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cReboiler itself contains one plate

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dNone of these

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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

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bDecreases

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cRemain same

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dIncreases linearly

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View Answer Increases

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