Chemical Engineering MCQs

Page No. 630

Drying operation under vacuum is carried out to __________________?


aDry those materials which have very high unbound moisture content

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bReduce drying temperature

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cIncrease drying temperature

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dDry materials having high bound moisture content

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In case of absorption with exothermic reaction, for fluids having ___________________?


aPr = Sc; percentage change in heat and mass transfer flux will be the same for a given change in the degree of turbulence

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bPr = Sc = 1; total mass, momentum and thermal diffusivity will be the same

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cBoth A. and B.

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dPr = Sc; there won’t be any change in heat and mass transfer flux with changes in degree of turbulence

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View Answer Both A. and B.

At equilibrium the concentration of water in vapour phase (C*) in kg/m3 of air space and the amount of water (m) adsorbed per kg of dry silica gel are related by, C* = 0.0667m. To maintain dry conditions in a room of air space 100m3 containing 2.2 kg of water vapour initially, 10 kg of dry silica gel is kept in the room. The fraction of initial water remaining in the air space after a long time (during which the temperature is maintained constant) is_________________?


a0.0

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b0.2

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c0.4

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d1.0

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View Answer 0.4

In a counter-current extractor, as the axial mixing increases, the extraction efficiency______________________?


aIncreases

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bDecreases

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cRemains unchanged

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dDepends on the pressure of the system

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View Answer Decreases

In saturated gas, the__________________?


aVapour is in equilibrium with the liquid at the gas temperature

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bVapour is in equilibrium with the liquid at the room temperature

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cPartial pressure of vapour equals the vapour pressure of the liquid at room temperature

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dNone of these

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Which of the following remains constant during sensible cooling process ?


aSpecific humidity

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bPartial pressure of vapour

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

For contacting a highly soluble gas with a liquid ____________________?


aBubble the gas through liquid

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bSpray the liquid on gas stream

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cEither A. or B. would suffice

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dNone of these

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The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?


aParallel

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bStraight

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cBoth parallel and straight

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dNeither parallel nor straight

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Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?


aViscosity with concentration

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bDegree of ideality of the solution

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

The binary diffusivity in gases does not depend upon the ___________________?


aPressure

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bTemperature

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cNature of the components

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dNone of these

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View Answer None of these

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