A. K ∝ D
B. K ∝√D
C. K ∝ D1.5
D. K ∝ D2
Related Mcqs:
- According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?
A. D
B. D2
C. D0.5
D. 1/D - Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________?
A. D0.5
B. D
C. 1/D
D. D1.5 - The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?
A. 1
B. 0.5
C. 10
D. 0 - Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?
A. K ∝D
B. K ∝√D
C. K ∝D1.5
D. K ∝D2 - For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?
A. Calculated
B. Unknown
C. Known
D. Not required - The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?
A. 100
B. 10
C. 5
D. 1 - The mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?
A. D/a
B. D/2a
C. Proportional to √D
D. Dependent on the Reynolds number - If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________
A. 0
B. 1
C. 1 - Penetration theory states that the mass transfer co-coefficient is equal to (where, De is diffusivity and ‘t’ is time) ?
A. (De.t)1/2
B. (De/t)1/2
C. (4De/πt)1/2
D. (4De/t) - Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
A. Film
B. Penetration
C. Surface-renewal
D. None of these
