A. 0
B. 1
C. 1
Related Mcqs:
- 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 - The diffusivity, DAB (for component A diffusing in B) is equal to the diffusivity DBA (for component B diffusing in A) for a binary mixture of________________?
A. Newtonian liquids
B. Non-Newtonian liquids
C. Ideal gases
D. Real gases - 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 - 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 - Lewis number (Le) is____________________?
A. Sc × Pr
B. Pr × St
C. Sh × Pr
D. St × Sh - 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) - Lewis number, which is important in problems involving simultaneous heat and mass transfer, is the ratio of__________________?
A. Mass diffusivity to momentum diffusivity
B. Thermal diffusivity to mass diffusivity
C. Momentum diffusivity to thermal diffusivity
D. None of these - In a single stage extraction process, 10 kg of pure solvent S (containing no solute A) is mixed with 30 kg of feed F containing A at a mass fraction xf = 0.2. The mixture splits into an extract phase E and a raffinate phase R containing A at xB = 0.5 and xR = 0.05 respectively. The total mass of the extract phase is (in Kg) ?
A. 6.89
B. 8.89
C. 10
D. 8.25 - The diffusivity D. in a binary gas mixture is related to the pressure (P) as__________________?
A. D ∝ P0.5
B. D ∝ 1/P0.5
C. D ∝ 1/P
D. D ∝ 1/P1.5 - The diffusivity D. in a binary gas mixture is related to the temperature (T) as________________________?
A. D ∝ T
B. D ∝ T0.5
C. D ∝ T1.5
D. D ∝ T2
