481. For gas absorption, low viscosity solvents are preferred, because of their
Better flow characteristics
Low pumping pressure drop
Rapid absorption rates
All of the above
✅ The correct answer is option D.
Mass Transfer MCQs
482. In a forced draft cooling tower, water is cooled from 95 to 80°F by exposure to air with a wet bulb temperature of 70°F. In this case, the
Range is 15°F
Approach is 10°F
Both A & B
Neither A nor B
✅ The correct answer is option C.
484. Steady state equimolal counter diffusion occurs in case of
Leaching
Absorption
Binary phase distillation
Liquid-liquid extraction
✅ The correct answer is option C.
485. Azeotropism for ethyl alcohol-water system disappears by
Increasing temperature
Decreasing pressure
Increasing pressure
No means
✅ The correct answer is option B.
486. Sides of equilateral-triangular co-ordinates (on which ternary liquid system is plotted) represent
A pure component
A binary mixture
A ternary mixture
Partially miscible ternary system
✅ The correct answer is option B.
487. The main reason for dividing a tall packed tower into series of small towers is to
Minimise the overall pressure drop
Avoid flooding
Reduce liquid hold up
Avoid channeling
✅ The correct answer is option D.
488. Which of the following is not a continuous drier?
Drum drier
Spray drier
Tunnel drier
Tray drier
✅ The correct answer is option D.
489. For continuous drying of grannular or crystalline material, the dryer used is the __________ dryer.
Tunnel
Tray
Rotary
None of these
✅ The correct answer is option C.
490. If moisture content of solid on dry basis is X, then the same on wet basis is
X/(X + 1)
X/(X – 1)
(X + 1)/X
(X – 1)/X
✅ The correct answer is option A.