Chemical Engineering MCQs

Page No. 652

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


aIncreases

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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

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bHigher absolute (specific) humidity

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cHigher relative humidity

✓


dHigher wet bulb temperature

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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

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View Answer 4.605

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


aPacked

✓


bPulse

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cBubble cap

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dSieve plate

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View Answer Packed

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


aAcross

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bAbove

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cBoth A. & B.

✓


dNeither A. nor B.

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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

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bDensity

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cSolubility

✓


dRelative volatility

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View Answer Solubility

Priming in a distillation column_________________?


aResults from very low gas velocity

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bIs desirable from point efficiency consideration

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

✓


dReduces the overall pressure drop

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


aRaising the temperature

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bLowering the total pressure

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cBoth A. and B.

✓


dNeither A. nor B.

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View Answer Both A. and B.

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


aGas

✓


bRoom

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cWet bulb

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dNone of these

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View Answer Gas

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


aTemperature rises

✓


bPressure rises

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cTemperature falls

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dPressure falls

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View Answer Temperature rises

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