Chemical Engineering MCQs

Page No. 684

Moisture in a solid exerting an equilibrium vapour pressure equal to that of the pure liquid at the same temperature is called the ___________________ moisture ?


aUnbound

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bCritical

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cFree

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dBound

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View Answer Unbound

The change in enthalpy, when a unit quantity of gas is absorbed by relatively large quantity of adsorbent (on which a definite concentration of the adsorbed gas already exists) is termed as the_________________?


aDifferential heat of adsorption

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bHeat of wetting

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cIntegral heat of adsorption

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dNone of these

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Swenson-Walker crystalliser is a __________________ unit ?


aContinuous

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bBatch

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cSemi-batch

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dCooling (adiabatic)-cum-evaporation

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View Answer Continuous

A 25 cm × 25 cm × 1 cm flat sheet weighing 1.2 kg initially was dried from both sides under constant drying rate conditions. It took 1500 seconds for the weight of the sheet to reduce to 1.05 kg. Another 1m × 1m × 1cm flat sheet of the same material is to be dried from one side only. Under the same constant drying rate conditions, the time required for drying (in seconds) from its initial weight of 19.2 kg to 17.6 kg is ____________________?


a1000

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b1500

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c2000

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d2500

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View Answer 1000

Henry’s law states that the ________________________?


aPartial pressure of a component over a solution is proportional to its mole fraction in the liquid

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bPartial pressure of a component over a solution is proportional to the mole fraction in the vapour

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cVapour pressure is equal to the product of the mole fraction and total pressure

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dPartial pressure is equal to the product of the mole fraction and total pressure

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Desulphurisation of petrol is done in a _____________________?


aBollman extractor

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bRotating disc extractor

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cPacked extraction column

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dPlate type extraction column

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Pressure drop through plate tower as compared to that through packed tower, for the same duty will be___________________?


aLess

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bMore

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cEqual

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dEither A. or B.; depends on the packing height

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View Answer More

For gas absorption, low viscosity solvents are preferred, because of their ____________________?


aBetter flow characteristics

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bLow pumping pressure drop

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cRapid absorption rates

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dAll A., B. and C.

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View Answer All A., B. and C.

Which of the following increases during evaporative cooling process with recirculated water supply ?


aWet bulb temperature

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bRelative humidity

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cPartial pressure of vapour

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dBoth B. and C.

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View Answer Both B. and C.

Drying of a solid involves _________________ transfer ?


aOnly heat

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bOnly mass

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cBoth heat and mass

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dNone of these

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View Answer Both heat and mass

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