Chemical Engineering MCQs

Page No. 660

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


aVetrocoke solution


bMonoethanolamine (MEA)


cDilute


dHot water



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


aVaries inversely as the pressure


bVaries directly as the pressure


cIs independent of pressure


dIs equal to the volumetric diffusivity



Unit of molal diffusivity is____________________?


acm2/sec gm . mole


bgm moles/cm2 . sec


cgm moles/cm. sec


dgm moles/cm2. sec


View Answer gm moles/cm. sec

Milk is dried usually in a __________________ dryer?


aFreeze


bSpray


cTray


dRotary


View Answer Spray

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


aDanckwerts


bToor and Marcello


cHigbie


dKissinevskii


View Answer Higbie

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


aConcentrated solution and non-isothermal operation


bDilute solution and non-isothermal operation


cDilute solution and isothermal operation


dConcentrated solution and isothermal operation



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


b0.079


c0.122


d0.152


View Answer 0.152

Advantage of continuous drying over batch drying is that the_____________________?


aDrying cost per unit weight of dried product is less


bProduct with more uniform moisture content is produced


cEquipment size required is smaller


dAll A , B. & C.


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


bTemperature of the mixture


cComposition of the mixture


dNone of these


View Answer None of these

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


aT


b√T


cT2


d1/T


View Answer T

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