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

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cConcentrated solutions

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dNone of these

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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)

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bM(Xo/XF)

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cM ln(Xo/XF)

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dMXo ln(Xo/XF)

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View Answer MXo ln(Xo/XF)

The Hatta number is important in______________________?


aMulti-component distillation

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bBinary distillation

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cGas absorption without chemical reaction

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dGas absorption with chemical reaction

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For a binary mixture with low relative volatility________________?


aUse steam distillation

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bUse molecular distillation

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cUse high pressure distillation

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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

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b1200

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c900

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d800

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View Answer 500

Rayleigh’s equation applies to _________________ distillation?


aContinuous

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bSteam

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cDifferential

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dFlash

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View Answer Differential

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


aDecreases

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bIncreases

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cRemains unchanged

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dNone of these

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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

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bIncreases the scale forming tendencies of water

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cIs undesirable

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dAll A., B. & C.

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


aEntrainment

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bFoaming

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cWeeping & dumping

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dAll A., B. & C.

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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

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b> 25

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c< 25

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d– 25

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View Answer > 25

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