Laboratory determination of the diffusivity of vapor is done by ______________ method?

Related Mcqs:

1. Laboratory determination of the diffusivity of vapor is done by __________________ method?

   A. Wetted wall column
   B. Gilliland’s
   C. Winkelmann’s
   D. Wike’s

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

   A. 1
   B. 0.5
   C. 10
   D. 0

3. 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

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

   A. 0
   B. 1
   C. 1

5. Experimental determination of ________________ is done by wetted wall column method?

   A. Diffusion co-efficient
   B. Mass transfer co-efficient
   C. NTU
   D. None of these

6. Experimental determination of _______________ is done by wetted wall column method?

   A. Diffusion co-efficient
   B. Mass transfer co-efficient
   C. NTU
   D. None of these

7. The assumption made in Elis method in distillation is that enthalpy concentration lines of vapor and liquid are __________________?

   A. Parallel
   B. Straight
   C. Both parallel and straight
   D. Neither parallel nor straight

8. In case of an ideal solution, the total vapor pressure varies ______________ with the composition expressed as mole fraction?

   A. Inversely
   B. Linearly
   C. Exponentially
   D. None of these

9. The rough value of diffusion co-efficient of water vapor into air at 25°C may be about ______________ cm2/sec?

   A. 0.25
   B. 2.5
   C. 1.25
   D. 0.0025

10. In case of liquid-liquid binary diffusion, diffusivity of one constituent into another is not dependent on the__________________?

    A. Temperature and pressure
    B. Concentration
    C. Nature of the constituents
    D. None of these