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

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bReflux ratio will be maximum

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cNumber of plates required will be maximum

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dNone of these

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_______________ diffusion is used for separating the isotopes of methane ?


aThermal

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bPressure

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cConcentration

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dForce

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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

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bDecreases

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cRemain unaffected

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dPasses through a maximum

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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

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bIncreasing the total pressure

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cReducing the temperature

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dboth B. and C.

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View Answer Both B. and C.

Steam distillation is used for separation of high boiling ____________________?


aSubstances from non-volatile impurities

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bVolatile impurity from still higher boiling substances

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cBoth A. and B.

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dNeither A. nor B.

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View Answer Both A. and B.

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


a-ve

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b+ve

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c1

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d-1

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View Answer -ve

The McCabe ΔL law states that the____________________?


aMolar heats of vaporisation of components are nearly equal

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

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cLinear crystal growth rate does not depend on the crystal size

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dLinear crystal growth rate depends on the crystal size

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


aReduce the overall pressure drop

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bAvoid channelling

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cReduce liquid hold-up

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dAvoid flooding

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View Answer Avoid channelling

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


aReverse osmosis

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bThermal diffusion

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cLeaching

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dSolvent extraction

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View Answer Thermal diffusion

Flash distillation is suitable for the separation of components_________________?


aHaving very close boiling points

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bWhich form maximum boiling azeotrope

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cHaving very wide boiling points

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dWhich form minimum boiling azeotrope

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