Chemical Engineering MCQs

Page No. 652

With increase in the concentration of the adsorbate, the integral heat of adsorption____________________?


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depends on the type of adsorbate


View Answer Decreases

Air initially at 101. 3 kPa and 40°C and with a relative humidity of 50%, is cooled at constant pressure to 30°C. The cooled air has a____________________?


aHigher dew point


bHigher absolute (specific) humidity


cHigher relative humidity


dHigher wet bulb temperature



An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is ?


a9.21


b4.605


c100


d0.001


View Answer 4.605

_______________ columns are used for liquid dispersion in a continuous gas phase ?


aPacked


bPulse


cBubble cap


dSieve plate


View Answer Packed

The efficiency of a plate column will be maximum, when the flow is ideal __________________ the plate?


aAcross


bAbove


cBoth A. & B.


dNeither A. nor B.


View Answer Both A. & B.

Separation of a mixture of two gases by absorption in the liquid solvent depends upon the difference in their____________________?


aViscosity


bDensity


cSolubility


dRelative volatility


View Answer Solubility

Priming in a distillation column_________________?


aResults from very low gas velocity


bIs desirable from point efficiency consideration


cIs characterised by the presence of foam throughout the space between trays


dReduces the overall pressure drop



The amount of steam required per unit quantity of distillate in case of steam distillation will be reduced by __________________?


aRaising the temperature


bLowering the total pressure


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

The dew point of a saturated gas phase equals the ________________ temperature?


aGas


bRoom


cWet bulb


dNone of these


View Answer Gas

The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the____________________?


aTemperature rises


bPressure rises


cTemperature falls


dPressure falls


View Answer Temperature rises

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