Chemical Engineering MCQs

Page No. 634

Boiling point diagram is not affected by the ambient______________________?


aPressure

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bHumidity

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cTemperature

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dBoth B. and C.

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View Answer Both B. and C.

Dry bulb temperature of unsaturated air is more than its ________________ temperature?


aDew point

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bWet bulb

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cBoth A & B

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dNeither A nor B

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View Answer Both A & B

Inside the distillation column, the________________________?


aDriving force for the vapour flow is the pressure drop

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bLiquids are not always at their bubble points

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cPressure increases gradually from bottom to the top of the column

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dNone of these

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A mixture of 10% C6H6 vapour in air at 25°C and 750 mm Hg has a dew point of 20°C. Its dew point at 30°C and 700 mm Hg will be around _______________ °C?


a21.7

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b20

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c27.3

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d18.7

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View Answer 18.7

Chemisorption (chemical adsorption) is_______________________?


aSame as “Van der Waals” adsorption

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bCharacterised by adsorption of heat

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cAn irreversible phenomenon

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dA reversible phenomenon

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The absorption factor is defined as (where, L = liquid flow rate, G = gas flow rate and, m = slope of the equilibrium line) ?


aL/mG

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bG/mL

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cmL/G

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dLG/m

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View Answer L/mG

When the feed to a distillation column is a saturated liquid, slope of the feed line is_____________________?


aZero

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bUnity

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cInfinity

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dNone of these

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View Answer Infinity

Fenske-Underwood equation used for calculating the minimum number of theoretical plates in distillation column is valid for_________________?


aConstant molal overflow

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bTotal reflux

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cConstant relative volatility

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dAll A., B. and C.

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View Answer All A., B. and C.

Solvent used in extractive distillation_________________________?


aIs of low volatility

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bForms a low boiling azeotrope

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cForms a high boiling azeotrope

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dDoes not alter the relative volatility of the original components

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As the reflux ratio in a distillation column is increased from the minimum, the______________________?


aSlope of the operating line in stripping section decreases

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bNumber of plates decreases very slowly first and then more and more rapidly

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cTotal cost first decreases and then increases

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dLiquid flow increases while the vapor flow decreases for a system

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