Chemical Engineering MCQs

Page No. 633

Which of the following quantities need not be fixed before starting the design of a cocurrent absorber ?


aHeat gain or loss

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bFlow rate of entering liquid

✓


cFlow rate of gas

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dNone of these

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During drying operation, it is easier to remove the ________________ moisture ?


aEquilibrium

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bCritical

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cUnbound

✓


dBound

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View Answer Unbound

In extractive distillation, solvent is_____________________?


aAdded to alter the relative volatility of the mixture

✓


bOf high volatility

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cPresent in overhead stream

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dOf high viscosity to give high tray efficiency

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At a fixed total pressure, humidity depends only on the _______________________?


aPartial pressure of vapour in the mixture

✓


bHeat capacity of the vapour

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cDensity of the vapour

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dNone of these

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The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?


a1

✓


b0.5

✖


c10

✖


d0

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View Answer 1

The diffusivity D. in a binary gas mixture is related to the temperature (T) as________________________?


aD ∝ T

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bD ∝ T0.5

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cD ∝ T1.5

✓


dD ∝ T2

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View Answer D ∝ T1.5

The change in enthalpy per unit weight of adsorbed gas when adsorbed on gas free or “outgassed” adsorbent to from a definite concentration of adsorbate is called its_____________________?


aIntegral heat of adsorption

✓


bHeat of wetting

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cDifferential heat of adsorption

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dHeat of normal condensation

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An Azeotropic mixture is a ________________ mixture?


aBinary

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bTernary

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cConstant boiling point

✓


dNone of these

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Inside the distillation columns, the ________________________?


aHighest temperatures is near the feed plate

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bDriving force for the liquid flow is its weight

✓


cVapors are not always at their dew points

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dAll A., B. and C.

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Total reflux in a distillation operation requires minimum____________________?


aReboiler load

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bNumber of plates

✓


cCondenser load

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dAll A., B. and C.

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View Answer Number of plates

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