Chemical Engineering MCQs

Page No. 678

Leaching of uranium ore and gold ore is done in________________________?


aCentrifugal extractor

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bPachuca tanks

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cBollman extractor

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dNone of these

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View Answer Pachuca tanks

In case of physical adsorption, the difference between heat of adsorption and heat of normal condensation is__________________?


aEqual to the heat of formation of surface compound

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bEqual to the heat of wetting

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cZero

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dCalled integral heat of adsorption

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Humidity chart is useful for the solution of problems concerning condensation, vaporisation and air conditioning. At a given dry bulb temperature, value of humidity obtained from the humidity chart directly, is in terms of _______________ humidity?


aMolal

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bRelative

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cPercentage

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dNone of these

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View Answer Molal

Powdery materials can be guarded against caking tendency on storage by_________________?


aProviding irregular grain size

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bProviding minimum percentage of voids

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cHaving maximum possible points of contact

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dNone of these

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View Answer None of these

The minimum liquid rate to be used in an absorber corresponds to an operating line_______________________?


aOf slope = 1

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bOf slope = 0.1

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cTangential to the equilibrium curve

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dNone of these

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Separation of two volatile liquids by distillation makes use of their________________________?


aSelectivity

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bRelative volatility

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cSolubility

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dDensity difference

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View Answer Relative volatility

The critical moisture content in case of drying indicates the _______________ rate period?


aBeginning of falling

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bBeginning of constant

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cEnd of falling

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dNone of these

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View Answer Beginning of falling

The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?


a√T

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bT

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cT2

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dT3

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View Answer T2

The dew point of an unsaturated gas-vapor mixture does not depend upon the ____________________ of the mixture?


aComposition

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bTemperature

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cTotal pressure

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dAll A., B. and C.

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View Answer Temperature

The slope of 9-line is determined by the______________________?


aReflux ratio

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bPlate efficiency to be achieved

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cThermal condition of the feed

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dRelative volatility

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