Chemical Engineering MCQs

Page No. 647

In the absorption of ammonia in water, the main resistance to absorption is by the _________________ phase?


aLiquid

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bGas

✓


cBoth A. & B.

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dNeither A. nor B.

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View Answer Gas

Tray spacing in a distillation column of dia 10-12 ft. used in petroleum refinery may be around _____________ inches?


a5

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b30

✓


c60

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d100

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View Answer 30

In a moderately sized packed absorption tower, channelling (which is most severe with stacked packings) can be minimised by taking the ratio of tower diameter to packing diameter ?


a> 4 :1

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b< 8 : 1

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c> 8:1

✓


d< 6:1

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View Answer > 8:1

Heat sensitive materials with very high latent heat of vaporisation may be economically separated using__________________?


aLiquid extraction

✓


bDistillation

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cEvaporation

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dAbsorption

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View Answer Liquid extraction

A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?


aComposition of vapors and that of liquid do not vary throughout the column

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bReboiler load and condenser load are minimum

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cThe top and bottom compositions are unchanged with and without total reflux

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dThe top and bottom compositions correspond to the maximum enrichment available

✓



Batch tray dryers suffers from the disadvantage of______________________?


aHigh maintenance cost

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bNon-uniform & low production rate

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cHigh labour cost & low heat economy

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dAll ‘a’, ‘b’ & ‘c’

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Smoke is an example of ___________________?


aSolid dispersed in liquid

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bSolid dispersed in gas

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cLiquid dispersed in gas

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dGas dispersed in liquid

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Rotary dryers cannot handle _______________ materials ?


aFree flowing

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bDry

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cSticky

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dGranular

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View Answer Sticky

Prandtl number for water at 20°C is about ________________?


a7

✓


b70

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c0.7

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d150

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View Answer 7

The difference of wet bulb temperature and adiabatic saturation temperature of unsaturated mixture of any system is___________________?


a+ve

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b-ve

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cZero

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dNone of these

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View Answer +ve

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