A. Flux = Co-efficient/concentration difference
B. Co-efficient = Flux/concentration difference
C. Flux=concentration difference/coefficient
D. None of these
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 - 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 - 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 - 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, moles/m2, a: interfacial area per unit volume of tower) ?
A. G/(FG . a)
B. FG/(G . a)
C. (G . a)/FG
D. L/(FG . G) - JD factor for mass transfer is a function of Reynolds number. Mass transfer by molecular diffusion from a single drop to surrounding still air is given by___________________?
A. Nsh = 2
B. Nst = 2
C. Nsc = 2
D. None of these - 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 - 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 - Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?
A. Film
B. Penetration
C. Surface-renewal
D. None of these - Which of the following is not a unit of mass transfer co-efficient ?
A. Moles transferred/ [(time) (area) (mole fraction)]
B. Moles transferred/ [(time) (area) (mass A/mass B)]
C. Moles transferred/ [(time) (area) (pressure)]
D. None of these - Mass transfer co-efficient of liquid is____________________?
A. Affected more by temperature than that for gases
B. Affected much less by temperature than that for gases
C. Not affected by the temperature
D. None of these
