Chemical Engineering MCQs

Page No. 672

Raschig ring made of porcelain cannot be used for treating concentrated___________________?


aHydrochloric acid

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bNitric acid

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cAlkalis

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dSulphuric acid

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View Answer Alkalis

Use of natural draft cooling tower is practised, when the air has low ?


aHumidity

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bTemperature

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cBoth A. & B.

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dNeither A. nor B.

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View Answer Both A. & B.

Molecular diffusivity of a liquid__________________?


aIncreases with temperature

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bDecreases with temperature

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cMay increase or decrease with temperature

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dIs independent of temperature

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At a fixed pressure, the humidity depends upon the partial pressure of vapor in the mixture. Humidity of a vapour free gas is ________________ percent.?


a100

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b0

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c50

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dBetween 0 and 100

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View Answer 0

All moisture in a non-hygroscopic material is the ________________ moisture?


aFree

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bEquilibrium

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cUnbound

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dBound

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View Answer Unbound

The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is____________________?


a1

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b∞

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c0.5

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d2

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View Answer 1

Molecular distillation is_____________________?


aHigh temperature distillation

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bFor heat-sensitive materials

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cVery low pressure distillation

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dBoth B. and C.

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View Answer Both B. and C.

The most efficient cooling tower out of the following is_____________________?


aInduced draft

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bForced draft

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cNatural draft

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dAtmospheric

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View Answer Induced draft

The main reason for dividing a tall packed tower into series of small towers is to________________________?


aMinimise the overall pressure drop

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bAvoid flooding

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cReduce liquid hold up

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dAvoid channelling

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View Answer Avoid channelling

Acetic acid will be most economically separated from a dilute solution of acetic acid in water by____________________?


aSolvent extraction

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bContinuous distillation

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cEvaporation

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dAbsorption

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View Answer Solvent extraction

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