A. Mass diffusivity to momentum diffusivity
B. Thermal diffusivity to mass diffusivity
C. Momentum diffusivity to thermal diffusivity
D. None of these
Related Mcqs:
- Which of the following plays an important role in problems of simultaneous heat and mass transfer ?
A. Lewis number
B. Schmidt number
C. Prandtl number
D. Sherwood number - 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 - Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the ________________ number?
A. Sherwood
B. Schmidt
C. Peclet
D. Stanton - Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?
A. Schmidt
B. Sherwood
C. Peclet
D. Stanton - ______________ column is the most suitable for achieving the best performance for mass transfer operations involving liquid with dispersed solids ?
A. Wetted wall
B. Packed
C. Plate
D. Spray - In case of cooling towers, the ratio of the rates of heat and mass transfer is indicated by the ______________ number ?
A. Lewis
B. Grashoff
C. Sherwood
D. None of these - _______________ number indicates the ratio of the rates of the heat and mass transfer incase of a cooling tower?
A. Sherwood
B. Stanton
C. Lewis
D. Peclet - If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________
A. 0
B. 1
C. 1