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
Related Mcqs:
- Experiments were conducted to determine the flux of a species A in a stagnant medium across a gas-liquid interface. The overall mass transfer co-efficient based on the liquid side for dilute systems for the above was estimated to be 4 × 10-3 kg mole/m2.s. The equilibrium data for the system is given as y = 2x. The flux across the interface (in kg mole/m2 .s) for bulk concentrations of A in gas phase and liquid phase as y = 0.4 and x = 0.01 respectively is _________________________?
A. 5.6 × 10-4
B. 8.5 × 10-4
C. 5.6 × 10-3
D. 8.5 × 10-3 - 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 - 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) - 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 - 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 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 - In a vapor-liquid contacting equipment, the overall gas phase mass transfer co-efficient (M.T.C), KG is related to individual co-efficients (KG and KL) as ___________________ ?
A. KG = 1/KG + m/KL
B. 1/KG = 1/KG + m/KL
C. 1/KG = 1/KL + m/KG
D. KG = 1/KL + m/KG - 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 - In an interphase mass transfer process, the lesser the solubility of a given solute in a liquid, the higher are the chances that the transfer process will be_________________?
A. Liquid phase resistance-controlled
B. Gas phase resistance controlled
C. Impossible
D. Driven by a non-linear driving force
