D ∝ T
D ∝ T0.5
D ∝ T1.5
D ∝ T2
✅ The correct answer is option C.
Mass Transfer MCQs
For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG:mass transfer co-efficient, mols/m² , a: in-terfacial area per unit volume of tower)
F/(FG.a)
FG/(G.a)
(G.a)/FG
L/(FG.G)
✅ The correct answer is option A.
The slope of 9-line is determined by the
Reflux ratio
Plate efficiency to be achieved
Thermal condition of the feed
Relative volatility
✅ The correct answer is option C.
The relative humidity of air decreases in-spite of an increase in the absolute humidity, when the
Temperature rises
Pressure rises
Temperature falls
Pressure falls
✅ The correct answer is option A.
When an unsaturated air-water mixture is heated at constant pressure, then
The partial pressure of water vapour increases
The specific humidity decreases
The relative humidity increases
The relative humidity decreases
✅ The correct answer is option D.
Batch tray dryers suffers from the disadvantage of
High maintenance cost
Non-uniform & low production rate
High labour cost & low heat economy
All of the above
✅ The correct answer is option C.