pertaining to the analogy between equations of heat and mass transfer operations ?

Related Mcqs:

1. Pick out the wrong statement pertaining to the analogy between equations of heat and mass_________________?

   transfer operations.
   A. Sherwood number in mass transfer is analogous to Nusselt number in heat transfer
   B. Prandtl number in heat transfer is analogous to Schmidt number in mass transfer
   C. Reynolds number in mass transfer is analogous to Grashoff number in heat transfer
   D. Reynolds number remains the same in both heat and mass transfer

2. 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

3. 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

4. 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

5. Corresponding to Nusselt number in heat transfer, the dimensionless group in mass transfer is the ________________ number?

   A. Sherwood
   B. Schmidt
   C. Peclet
   D. Stanton

6. Corresponding to Prandtl number in heat transfer, the dimensionless group in mass transfer is the _______________ number?

   A. Schmidt
   B. Sherwood
   C. Peclet
   D. Stanton

7. ______________ 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

8. 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)

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. According to Chilton-Colburn analogy for mass transfer, NSt.NSc 2/3 is equal to_________________?

    A. f
    B. f/2
    C. 2f
    D. 1/f