Chemical Engineering MCQs

Page No. 634

Boiling point diagram is not affected by the ambient______________________?


aPressure


bHumidity


cTemperature


dBoth B. and C.


View Answer Both B. and C.

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


aDew point


bWet bulb


cBoth A & B


dNeither A nor B


View Answer Both A & B

Inside the distillation column, the________________________?


aDriving force for the vapour flow is the pressure drop


bLiquids are not always at their bubble points


cPressure increases gradually from bottom to the top of the column


dNone of these



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


b20


c27.3


d18.7


View Answer 18.7

Chemisorption (chemical adsorption) is_______________________?


aSame as “Van der Waals” adsorption


bCharacterised by adsorption of heat


cAn irreversible phenomenon


dA reversible phenomenon



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


aL/mG


bG/mL


cmL/G


dLG/m


View Answer L/mG

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


aZero


bUnity


cInfinity


dNone of these


View Answer Infinity

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


aConstant molal overflow


bTotal reflux


cConstant relative volatility


dAll A., B. and C.


View Answer All A., B. and C.

Solvent used in extractive distillation_________________________?


aIs of low volatility


bForms a low boiling azeotrope


cForms a high boiling azeotrope


dDoes not alter the relative volatility of the original components



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


aSlope of the operating line in stripping section decreases


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


cTotal cost first decreases and then increases


dLiquid flow increases while the vapor flow decreases for a system



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