Flux = Co-efficient/concentration difference
Co-efficient = Flux/concentration difference
Flux=concentration difference/co-effi-cient
None of these
✅ The correct answer is option B.
Mass Transfer MCQs
572. Ponchan-Savarit method analyses the fractional equipment based on
Enthalpy balance only
Material balance only
Both enthalpy and material balances
The assumption of constant molaloverflow
✅ The correct answer is option C.
573. The unit of volumetric diffusivity is
Cm²/sec
Cm/sec
Cm³/sec
Cm²/seC₂
✅ The correct answer is option A.
574. Deairation (removal of O₂) of water is done by
Rectification
Absorption
Ion-exchange
Adsorption
✅ The correct answer is option C.
575. If f = moles of vapour present per mole of feed, then the slope of feed line is (Mcabe-Thiele method)
(1 – f)/f
#REF!
#REF!
#REF!
✅ The correct answer is option C.
576. Removal of __________ exemplifies an adsorption unit operation.
Uranium from its ore
Water from petrol
Ammonia from coke oven gas
Mustard oil from mustard seed
✅ The correct answer is option B.
577. The overall mass transfer co-efficient for the absorption of SO₂ in air with dilute NaOH solution can be increased substantially by
Increasing the gas film co-efficient
Increasing the liquid film co-efficient
Increasing the total pressure
Decreasing the total pressure
✅ The correct answer is option A.
578. Advantage of continuous drying over batch drying is that the
Drying cost per unit weight of dried product is less
Product with more uniform moisture content is produced
Equipment size required is smaller
All of the above
✅ The correct answer is option D.
579. The most economical range of absorption factor is
0 to 0.5
0 to 3
1.25 to 2
5 to 15
✅ The correct answer is option C.
580. Coffee is prepared from coffee beans by leaching with
Cold water
Hot water
Dilute hot caustic solution
Naphtha
✅ The correct answer is option B.