Chemical Engineering MCQs

Page No. 680

Pick out the wrong statement. Raoult’s law does not apply, when the______________________?


aSize of component molecules are not equal

✖


bAttractive forces between like and unlike molecules in the solution are approximately equal

✖


cComponent molecules are non-polar

✓


dChemical combination or molecular association between unlike molecules takes place in the formation of solution

✖


View Answer Component molecules are non-polar

Pick out the wrong statement pertaining to the analogy between equations of heat and mass_________________?


aSherwood number in mass transfer is analogous to Nusselt number in heat transfer

✖


bPrandtl number in heat transfer is analogous to Schmidt number in mass transfer

✖


cReynolds number in mass transfer is analogous to Grashoff number in heat transfer

✓


dReynolds number remains the same in both heat and mass transfer

✖


View Answer Reynolds number in mass transfer is analogous to Grashoff number in heat transfer

Water entrained by circulating air in cooling towers is termed as____________________?


aDrift

✓


bBlow down

✖


cVapor load

✖


dNone of these

✖


View Answer Drift

Alcohol is dehydrated using _______________________ distillation?


aExtractive

✖


bAzeotropic

✓


cSteam

✖


dMolecular

✖


View Answer Azeotropic

Pick out the wrong statement ?


an solvent extraction, the distribution co-efficient should be as large as possible for solvent economy

✖


bWith increase in pressure, the solubility of gases in solvent increases at a fixed temperature

✖


cDecrease in Murphree plate efficiency is an indication of entrainment in distillation column

✖


dThe capacity of a distillation column is maximum at total reflux

✓


View Answer The capacity of a distillation column is maximum at total reflux

Pick out the wrong statement ?


aChange in barometric pressure does not affect the relative humidity

✖


bIn case of a packed tower, the operating velocity is about half of the flooding velocity, generally

✖


cElution’ means the desorption of the adsorbed solute by a solvent

✖


dThe equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

✓


View Answer The equilibrium moisture content of the solid can be reduced by increasing the absolute humidity

Pick out the wrong statement?


aMass transfer co-efficient does not account for gas-liquid diffusion

✓


bDiffusion co-efficient and mass transfer co-efficient are not same in any mass transfer operation

✖


cContacting cold vapor-gas mixture with hot liquid exemplifies humidification process

✖


dContacting cold liquid with warm vapor-gas mixture exemplifies dehumidification process

✖


View Answer Mass transfer co-efficient does not account for gas-liquid diffusion

Pick out the wrong statement ?


aMechanical agitation is required, if the system has low interfacial tension

✓


bSieve tray towers are generally used for systems having low interfacial tension

✖


cWhen Henry’s law constant is very small, then the mass transfer rate is controlled by the gas film resistance

✖


dTaylor-Prandtl analogy for heat and mass transfer considers the transfer through both laminar and turbulent layers

✖


View Answer Mechanical agitation is required, if the system has low interfacial tension

Pick out the wrong statement ?41311


aCo-current absorbers are usually used, when the gas to be dissolved in the liquid is a pure substance

✖


bIn case of gas absorption, HETP is equal to HTU, when both the operating line & the equilibrium lines are parallel

✖


cHatta number is important in case of gas absorption with chemical reaction

✖


dIn actual practice, absorption is an endothermic process, while stripping is an exothermic process

✓


View Answer In actual practice, absorption is an endothermic process, while stripping is an exothermic process

Pick out the wrong statement ?


aHigh early strength cement are made from materials having high silica to lime ratio

✓


bThe function of gypsum in cement is to enhance its initial setting rate

✖


cAcid resistant cements are known as silicate cement

✖


dMajor component of greyish Portland cement is tricalcium silicate

✖


View Answer High early strength cement are made from materials having high silica to lime ratio

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