Equal to the heat of formation of surface compound
Equal to the heat of wetting
Zero
Called integral heat of adsorption
✅ The correct answer is option B.
Chemical Engineering MCQs
In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the
Temperature and pressure
Concentration
Nature of the constituents
None of these
✅ The correct answer is option D.
In case of non-ideal gases and liquids, the molal diffusivity
Varies inversely as the pressure
Varies directly as the pressure
Is independent of pressure
Is equal to the volumetric diffusivity
✅ The correct answer is option C.
Very tall packed towers are divided into series of beds to
Reduce the overall pressure drop
Avoid channelling
Reduce liquid hold-up
Avoid flooding
✅ The correct answer is option B.
Steam distillation is used to
Reduce the number of plates
Avoid thermal decomposition of a component
Increase the efficiency of separation
Increase the total pressure of distillation
✅ The correct answer is option B.
McCabe-Thiele method
Uses molal units for material and energy balance
Uses weight fractions to express liquid and vapour composition
Can use any type of units
Is more accurate than Ponchan-Savarit method
✅ The correct answer is option A.
In liquid-liquid extraction, the number of phases at plait point is
1
2
3
4
✅ The correct answer is option A.
Which of the following gas-liquid contacting devices incurs the least pressure drop for a particular duty?
Grid tray tower
Perforated tray tower
Wetted wall tower
Bubble cap tower
✅ The correct answer is option D.
If G = insoluble gas in gas stream and L = non-volatile solvent in liquid stream, then the slope of the operating line for the absorber is
L/G
G/L
Always < 1
None of these
✅ The correct answer is option A.
Boiling point diagram is
Not affected by pressure
Affected by pressure
A plot of temperature vs. liquid composition
A plot of temperature vs. vapour composition
✅ The correct answer is option B.