31. Dry bulb temperature of unsaturated air is more than its __________ temperature.
Dew point
Wet bulb
Both A & B
Neither A nor B
✅ The correct answer is option C.
Mass Transfer MCQs
32. During drying operation, it is easier to remove the __________ moisture.
Equilibrium
Critical
Unbound
Bound
✅ The correct answer is option C.
33. __________ diffusion is used for separating the isotopes of methane.
Thermal
Pressure
Concentration
Force
✅ The correct answer is option A.
34. With increase in solvent rate, the number of transfer units, NtoG, for a fixed degree of absorption from a fixed amount of gas
Increases
Decreases
Decreases linearly
Remains unaffected
✅ The correct answer is option B.
35. The adiabatic saturation curve for a vapour-gas mixture is
Straight line
Slightly concave upward
Slightly concave downward
None of these
✅ The correct answer is option B.
36. Inside the distillation column, the
Driving force for the vapour flow is the pressure drop
Liquids are not always at their bubble points
Pressure increases gradually from bottom to the top of the column
None of these
✅ The correct answer is option A.
37. Flights in a rotary dryer are provided to
Lift and shower the solids thus exposing it thoroughly to the drying action of the gas
Reduce the residence time of solid
Increase the residence time of the solid
None of these
✅ The correct answer is option A.
38. Molecular seives are regenerated by heating to __________ °C.
< 150
200-330
> 500
> 1000
✅ The correct answer is option B.
39. At __________ reflux, theoretical number of plates in a distillation coloumn is calculated using Fenske-Underwood equation.
Operating
Total
Minimum
Maximum permissible
✅ The correct answer is option B.
40. Separation of __________ employs gaseous diffusion process.
N₂ and O₂ from air
Isotopes of uranium
Isotopes of helium
SO₂ and air
✅ The correct answer is option B.