451. For achieving rapid drying rate in a spray dryer, the diameter of the particles in the feed should be in the range of __________ microns (1 mm = 1000 microns).
1-May
Oct-60
200-300
> 500
✅ The correct answer is option B.
Mass Transfer MCQs
452. In stripping section of continuous distillation column, the
Liquid is stripped of high boiler
Liquid is enriched with high boiler
Vapour is stripped of low boiler
None of these
✅ The correct answer is option B.
453. Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in
Viscosity with concentration
Degree of ideality of the solution
Both A & B
Neither A nor B
✅ The correct answer is option C.
454. Rate of adsorption increases as the
Temperature increases
Temperature decreases
Pressure decreases
Size of adsorbent increases
✅ The correct answer is option B.
455. An azeotropic mixture is a __________ mixture.
Binary
Ternary
Constant boiling point
None of these
✅ The correct answer is option C.
456. A natural draft cooling tower is filled with wooden grids, which covers about __________ percent of the tower height.
Oct-15
30-40
70-80
90-100
✅ The correct answer is option A.
457. In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be
Liquid phase resistance-controlled
Gas phase resistance controlled
Impossible
Driven by a non-linear driving force
✅ The correct answer is option B.
458. An alkaline solution is used to reduce the concentration of carbon dioxide in a stream from 10% to 0.1% by absorption with irreversible chemical reaction. The overall number of transfer units based on gas phase is
9.21
4.605
100
0.001
✅ The correct answer is option B.
459. Which of the following parameters remains constant during chemical dehumidifica-tion?
Dry bulb temperature
Partial pressure of vapour
Wet bulb temperature
None of these
✅ The correct answer is option A.
460. __________ column is preferred to be used, when a high liquid hold up is required in a reactor for gas-liquid reaction.
Packed
Bubble
Spray
Tray
✅ The correct answer is option B.