The mass diffusivity, the thermal diffusivity and the eddy momentum diffusivity are same for, NPr = NSc = _________________?

Related Mcqs:

1. NSc/NPr is called the______________________?

   A. Psychrometric ratio B. Lewis number C. Sherwood number D. Stanton number...

2. If mass diffusivity in a mixture is equal to the thermal diffusivity, then the Lewis number is____________________

   A. 0 B. 1 C. 1...

3. 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...

4. (NRe . NSc) is termed in mass transfer operation as the ______________ number?

   A. Stanton B. Sherwood C. Peclet D. None of these...

5. (NSh/NRe.NSc) is termed in mass transfer operation as the __________________________?

   A. Stanton number B. Peclet number C. Thermal diffusivity D. Momentum diffusivity...

6. 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...

7. 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...

8. 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...

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)...