Chemical Engineering MCQs

Page No. 660

Which of the following is a suitable absorbent for removal of H2S from natural gas ?


aVetrocoke solution

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bMonoethanolamine (MEA)

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cDilute

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dHot water

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In case of non-ideal gases and liquids, the molal diffusivity ________________?


aVaries inversely as the pressure

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bVaries directly as the pressure

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cIs independent of pressure

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dIs equal to the volumetric diffusivity

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Unit of molal diffusivity is____________________?


acm2/sec gm . mole

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bgm moles/cm2 . sec

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cgm moles/cm. sec

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dgm moles/cm2. sec

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View Answer gm moles/cm. sec

Milk is dried usually in a __________________ dryer?


aFreeze

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bSpray

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cTray

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dRotary

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View Answer Spray

Penetration model (theory) for mass transfer was enunciated by _____________________?


aDanckwerts

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bToor and Marcello

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cHigbie

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dKissinevskii

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View Answer Higbie

For an absorber, both equilibrium and operating line will be straight for _______________________?


aConcentrated solution and non-isothermal operation

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bDilute solution and non-isothermal operation

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cDilute solution and isothermal operation

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dConcentrated solution and isothermal operation

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An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively. The humidity of air sample expressed as kg of water vapour/kg of dry air is__________________?


a0.048

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b0.079

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c0.122

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d0.152

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View Answer 0.152

Advantage of continuous drying over batch drying is that the_____________________?


aDrying cost per unit weight of dried product is less

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bProduct with more uniform moisture content is produced

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cEquipment size required is smaller

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dAll A , B. & C.

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View Answer All A , B. & C.

The relative saturation of an unsaturated mixture of gas and vapor is independent of the___________________?


aNature of the vapor

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bTemperature of the mixture

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cComposition of the mixture

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dNone of these

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View Answer None of these

In case of liquids, the binary diffusivity is proportional to (where, T = temperature) _____________________?


aT

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b√T

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cT2

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d1/T

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View Answer T

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