Chemical Engineering MCQs

Page No. 679

Freundlich equation applies to the adsorption of solute from_____________________?


aDilute solutions, over a small concentration range


bGaseous solutions at high pressure


cConcentrated solutions


dNone of these



A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))_____________?


aM(Xo – XF)


bM(Xo/XF)


cM ln(Xo/XF)


dMXo ln(Xo/XF)


View Answer MXo ln(Xo/XF)

The Hatta number is important in______________________?


aMulti-component distillation


bBinary distillation


cGas absorption without chemical reaction


dGas absorption with chemical reaction



For a binary mixture with low relative volatility________________?


aUse steam distillation


bUse molecular distillation


cUse high pressure distillation


dAn azeotrope may be formed during distillation



The interfacial area per unit volume of dispersion, in a gas-liquid contactor, for fractional hold up of gas = 0.1 and gas bubble diameter = 0.5 mm is given by (in m2/m3) ?


a500


b1200


c900


d800


View Answer 500

Rayleigh’s equation applies to _________________ distillation?


aContinuous


bSteam


cDifferential


dFlash


View Answer Differential

In extraction, as the temperature increases, the area of heterogeneity (area covered by binodal curve)________________?


aDecreases


bIncreases


cRemains unchanged


dNone of these


View Answer Decreases

Blowdown in a cooling tower____________________?


aMeans discarding a small fraction of circulating water to prevent and limit the concentration of salt and impurities


bIncreases the scale forming tendencies of water


cIs undesirable


dAll A., B. & C.



Plate efficiency in a distillation column is reduced due to the ______________________ of liquid?


aEntrainment


bFoaming


cWeeping & dumping


dAll A., B. & C.


View Answer All A., B. & C.

The wet and ‘dry bulb temperature for a vapour-gas mixture are 25°C and 30°C respectively. If the mixture is heated to 45°C at constant pressure, the wet bulb temperature will be ______________ °C?


a25


b> 25


c< 25


d– 25


View Answer > 25

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