A. Danckwerts
B. Toor and Marcello
C. Higbie
D. Kissinevskii
Related Mcqs:
- The film penetration model of mass transfer was enunciated by______________________?
A. Gilliland
B. Toor and Marcello
C. Stefan
D. Fick - 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 - Surface renewal model of mass transfer was enunciated by___________________?
A. Toor and Marcello
B. Fick
C. Danckwerts
D. Stefan - 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) - 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 - 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 - 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 - 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) - 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)
