Chemical Engineering MCQs

Page No. 674

The temperature of water cooled in cooling tower is always _________________ temperature of entering air?


aMore than the wet bulb

✓


bLess than the wet bulb

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cEqual to the wet bulb

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dEqual to the dry bulb

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Drying of a wet solid under constant drying conditions means the exposure of the wet solid to the air of constant____________________?


aHumidity

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bVelocity

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cTemperature

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dAll A., B. & C.

✓


View Answer All A., B. & C.

With the lowering of equilibrium pressure, at a given temperature, the amount of adsorbate on the adsorbent______________________?


aIncreases

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bDecreases

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cRemain same

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dEither A. or B., depends on the system

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View Answer Decreases

In liquid extraction, if the selectivity is unity, then___________________?


aSeparation of the constituents is the most effective

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bNo separation will occur

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cAmount of solvent required will be minimum

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dSolvent flow rate should be very low

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Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?


aFilm

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bPenetration

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cSurface-renewal

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dNone of these

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View Answer Film

___________________ extractor uses centrifugal force for separating the two phases?


aTreybal

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bScheibel

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cPodbielniak

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dNone of these

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View Answer Podbielniak

The operating cost of a distillation column at minimum reflux ratio is____________________?


aMinimum

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bMaximum

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cInfinite

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dZero

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View Answer Minimum

A pure drug is administered as a sphere and as a cube. The amount of drug is the same in the two tablets. Assuming that the shape and size do not influence the mass transfer, the ratio of rate of dissolution in water at t = 0 for the cubic to spherical tablet is___________________?


a0.54

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b1.04

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c1.24

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d1.94

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View Answer 1.24

The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?


aD ∝ P0.5

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bD ∝ 1/P0.5

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cD ∝ 1/P

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dD ∝ 1/P1.5

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View Answer D ∝ 1/P

Dorr thickener is an equipment used for___________________?


aClassification

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bSedimentation

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cClarification

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dLeaching

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View Answer Sedimentation

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