Chemical Engineering MCQs

Page No. 667

For a distillation column operating at minimum reflux, the_______________________?


aConcentration of liquid and vapour leaving a plate will be same


bReflux ratio will be maximum


cNumber of plates required will be maximum


dNone of these



_______________ diffusion is used for separating the isotopes of methane ?


aThermal


bPressure


cConcentration


dForce


View Answer Thermal

For a fixed number of ideal stages in a distillation column, as the reflux ratio is increased, the difference in composition between the top and bottom product streams__________________?


aIncreases


bDecreases


cRemain unaffected


dPasses through a maximum


View Answer Increases

The relative saturation of a partially saturated mixture of vapour and gas can be increased by ________________ of the mixture?


aReducing the total pressure


bIncreasing the total pressure


cReducing the temperature


dboth B. and C.


View Answer Both B. and C.

Steam distillation is used for separation of high boiling ____________________?


aSubstances from non-volatile impurities


bVolatile impurity from still higher boiling substances


cBoth A. and B.


dNeither A. nor B.


View Answer Both A. and B.

When both the fluids flow concurrently in an absorber, the slope of the operating line is____________________?


a-ve


b+ve


c1


d-1


View Answer -ve

The McCabe ΔL law states that the____________________?


aMolar heats of vaporisation of components are nearly equal


bLinear crystal growth rate depends on the degree of super-saturation


cLinear crystal growth rate does not depend on the crystal size


dLinear crystal growth rate depends on the crystal size



Very tall packed towers are divided into series of beds to___________________?


aReduce the overall pressure drop


bAvoid channelling


cReduce liquid hold-up


dAvoid flooding


View Answer Avoid channelling

Separation of the isotopes of helium for scientific investigations is done by_____________________?


aReverse osmosis


bThermal diffusion


cLeaching


dSolvent extraction


View Answer Thermal diffusion

Flash distillation is suitable for the separation of components_________________?


aHaving very close boiling points


bWhich form maximum boiling azeotrope


cHaving very wide boiling points


dWhich form minimum boiling azeotrope



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