Chemical Engineering MCQs

Page No. 661

Hypersorption refers to a ________________ process?


aFixed bed absorption

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bMoving bed absorption

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cFixed bed adsorption

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dMoving bed adsorption

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View Answer Moving bed adsorption

Moisture contained by a substance in excess of the equilibrium moisture is called the _______________ moisture?


aUnbound

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bFree

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cCritical

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dBound

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View Answer Free

In case of ______________ distillation, a solvent is added to alter the relative volatility of the mixture to be separated?


aMolecular

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bAzeotropic

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cExtractive

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dFlash

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View Answer Extractive

If the specific heats of a gas and a vapor are 0.2KJ/Kg.°K and 1.5 KJ/Kg.°K respectively, and the humidity is 0.01; the humid heat in KJ/°Kg. is________________?


a0.31

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b0.107

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c0.017

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d0.215

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View Answer 0.215

If the path of liquid across the plate is very long as in case of large diameter tower, Murphree efficiency can be _______________ percent?


a100

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b> 100

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c< 100

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dNone of these

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View Answer > 100

McCabe-Thiele method________________?


aUses molal units for material and energy balance

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bUses weight fractions to express liquid and vapour composition

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cCan use any type of units

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dIs more accurate than Ponchon-Savarit method

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The relation, Sc = Pr = 1, is valid, when the mechanism of ______________ transfer is same?


aHeat and mass

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bMass and momentum

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cHeat and momentum

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dHeat, momentum and mass

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View Answer Heat and mass

Dew point of an air-water vapor mixture_________________?


aDecreases with decrease in pressure

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bAt constant humidity & total pressure is fixed

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cCorresponding to any point on the humidity chart is obtained by projecting a line through this point parallel to the temperature axis and to the saturation curve

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dAll A , B. & C.

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View Answer All A , B. & C.

The value of Lewis number (Le = Sc/Pr) for air-water vapour system is around_________________?


a1

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b0.24

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c3.97

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d600

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View Answer 1

Unsaturated air (with dry bulb temperature and dew point being 35°C and 18°C respectively) is passed through a water spray chamber maintained at 15°C. The air will be cooled_________________?


aAnd humidified

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bAnd dehumidified with increase in wet bulb temperature

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cAt the same relative humidity

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dAnd dehumidified with decrease in wet bulb temperature

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