Chemical Engineering MCQs

Page No. 645

The temperature to which a vapour gas mixture must be cooled (at varying humidity) to become saturated is called the ______________ temperature?


aDew point

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bWet bulb

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cDry bulb

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dNone of these

✓


View Answer None of these

The adiabatic saturation curve for a vapour-gas mixture is__________________?


aStraight line

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bSlightly concave upward

✓


cSlightly concave downward

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dNone of these

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Flights in a rotary dryer are provided to________________?


aLift and shower the solids thus exposing it thoroughly to the drying action of the gas

✓


bReduce the residence time of solid

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cIncrease the residence time of the solid

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dNone of these

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Stefan’s law describes the mass transfer by________________?


aDiffusion

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bBulk flow

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cBoth A. & B.

✓


dNeither A. nor B.

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View Answer Both A. & B.

Fenske equation for determining the minimum number of theoretical stages in distillation column holds good, when the_________________?


aRelative volatility is reasonably constant

✓


bMixture (to be separated) shows negative deviation from ideality

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cMixture (to be separated) shows positive deviation from ideality

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dMulti-component distillation is involved

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Use of raschig rings in place of crushed stones as packing in packed beds (other things being same) ?


aIncreases pressure drop, increases surface area

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bIncreases pressure drop, decreases surface area

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cDecreases pressure drop, increases surface area

✓


dDecreases pressure drop, decreases surface area

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When the psychometric ratio is ______________ then the adiabatic saturation temperature and wet bulb temperature becomes equal?


a1

✓


b∞

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c0

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d2

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View Answer 1

The overall mass transfer co-efficient for the absorption of SO2 in air with dilute NaOH solution can be increased substantially by___________________?


aIncreasing the gas film co-efficient

✓


bIncreasing the liquid film co-efficient

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cIncreasing the total pressure

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dDecreasing the total pressure

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Liquid diffusivity is of the order of _______________ cm2 /second?


a0.01

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b0.1

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c10-5 to 10-6

✓


d> 1

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View Answer 10-5 to 10-6

Molecular diffusion is caused by the________________?


aTransfer of molecules from low concentration to high concentration region

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bThermal energy of the molecules

✓


cActivation energy of the molecules

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dPotential energy of the molecules

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