A. Directly proportional to ‘T1.5’
B. Inversely proportional to ‘P’
C. Dependent on the molecular volume & molecular weight of components
D. All A , B. & C.
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 - 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 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 - Laboratory determination of the diffusivity of vapor is done by __________________ method?
A. Wetted wall column
B. Gilliland’s
C. Winkelmann’s
D. Wike’s - Unit of molal diffusivity is____________________?
A. cm2/sec gm . mole
B. gm moles/cm2 . sec
C. gm moles/cm. sec
D. gm moles/cm2. sec - In case of non-ideal gases and liquids, the molal diffusivity ________________?
A. Varies inversely as the pressure
B. Varies directly as the pressure
C. Is independent of pressure
D. Is equal to the volumetric diffusivity - The binary diffusivity in gases and liquids vary respectively as_________________?
A. T3/2 and T
B. T and T3/2
C. √T and T3/2
D. T3/2 and √T - Liquid diffusivity is of the order of _______________ cm2 /second?
A. 0.01
B. 0.1
C. 10-5 to 10-6
D. > 1 - Diffusivity in concentrated solutions differs from that in dilute solutions, because of the changes in ____________________?
A. Viscosity with concentration
B. Degree of ideality of the solution
C. Both A. and B.
D. Neither A. nor B.