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


bCritical


cFree


dBound


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


bHeat of wetting


cIntegral heat of adsorption


dNone of these



Swenson-Walker crystalliser is a __________________ unit ?


aContinuous


bBatch


cSemi-batch


dCooling (adiabatic)-cum-evaporation


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


b1500


c2000


d2500


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


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


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


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



Desulphurisation of petrol is done in a _____________________?


aBollman extractor


bRotating disc extractor


cPacked extraction column


dPlate type extraction column



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


aLess


bMore


cEqual


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


View Answer More

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


aBetter flow characteristics


bLow pumping pressure drop


cRapid absorption rates


dAll A., B. and C.


View Answer All A., B. and C.

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


aWet bulb temperature


bRelative humidity


cPartial pressure of vapour


dBoth B. and C.


View Answer Both B. and C.

Drying of a solid involves _________________ transfer ?


aOnly heat


bOnly mass


cBoth heat and mass


dNone of these


View Answer Both heat and mass

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