Penetration model (theory) for mass transfer was enunciated by _____________________?

Related Mcqs:

1. The film penetration model of mass transfer was enunciated by______________________?

   A. Gilliland B. Toor and Marcello C. Stefan D. Fick...

2. 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...

3. Surface renewal model of mass transfer was enunciated by___________________?

   A. Toor and Marcello B. Fick C. Danckwerts D. Stefan...

4. 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)...

5. 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...

6. 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...

7. 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...

8. 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...

9. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids)) ?

   A. M(Xo – XF) B. M(Xo/XF) C. M ln(Xo/XF) D. MXo ln(Xo/XF)...

10. A solid is being dried in the linear drying rate regime from moisture content Xo to XF. The drying rate is zero at X = 0 and the critical moisture content is the same as the initial moisture Xo. The drying time for M = (Ls/ARc) is (where, L = total mass of dry solid, A = total surface area for drying Rc = Constant maximum drying rate per unit area X = moisture content (in mass of water/mass of dry solids))_____________?

    A. M(Xo – XF) B. M(Xo/XF) C. M ln(Xo/XF) D. MXo ln(Xo/XF)...