21. Humid volume, at a given temperature is a/an __________ function of humidity.
Inverse
Exponential
Linear
Logarithmic
✅ The correct answer is option C.
Mass Transfer MCQs
22. Chemisorption (chemical adsorption) is
Same as “Van der Waals” adsorption
Characterised by adsorption of heat
An irreversible phenomenon
A reversible phenomenon
✅ The correct answer is option C.
23. In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raf-finate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg)
6.89
8.89
10
8.25
✅ The correct answer is option B.
24. Which of the following is the most commonly used leaching solvent in vegetable oil industry?
Phenol
Hexane
Furfurol
Liquid SO₂
✅ The correct answer is option B.
25. The dimension of diffusivity is same as that of the
Density
Molal concentration
Kinematic viscosity
Velocity head
✅ The correct answer is option C.
26. If the overall efficiency and Murphree plate efficiency are equal, then both the equilibrium and operating lines are
Straight
Parallel
Both A & B
Neither A nor B
✅ The correct answer is option C.
27. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the __________ temperature.
Dry-bulb
Wet-bulb
Dew point
Adiabatic saturation
✅ The correct answer is option B.
28. Pore size of the molecular seive 5A is __________ mm.
5
0.5
0.05
50
✅ The correct answer is option B.
29. Sodium bicarbonate is produced during soda ash manufacture using a __________ tower.
Plate
Baffle
Packed
None of these
✅ The correct answer is option B.
30. CO₂ can be absorbed by
Hot cupric oxide
Heated charcoal
Cold Ca(OH)₂
Alumina
✅ The correct answer is option B.