Steady state equimolal counter diffusion occurs in case of ____________________?

Related Mcqs:

1. Steady state equimolal counter diffusion is encountered in_____________________?

   A. Separation of a binary mixture by distillation
   B. Absorption of NH3 from air by water
   C. All liquid-liquid diffusion systems
   D. All liquid-solid diffusion systems

2. The value of NA/(NA + NB), for steady state equimolal counter diffusion of two gases ‘A’ and ‘B’ is____________?

   A. 1
   B. ∞
   C. 0.5
   D. 2

3. The relation among various mass transfer co-efficients (M.T.C) for ideal gases is given by (where, Kc & Km are M.T.C. for equimolar counter diffusion with concentration & mole fraction respectively as the driving force. and, Kp= M.T.C. for diffusion of a gas through a stagnant inert gas with pressure as driving force) ?

   A. Kc = Kp = Km
   B. Kc = Kp/RT = Km . RT/P
   C. Kc = Kp . RT = Km . RT/p
   D. None of these

4. The value of NA/(NA + NB) for steady state molecular diffusion of gas ‘A’ through nondiffusing gas ‘B’ is____________________?

   A. 1
   B. ∞
   C. 0.5
   D. 2

5. Ordinary diffusion process is also called ______________ diffusion?

   A. Pressure
   B. Thermal
   C. Concentration
   D. Forced

6. The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

   A. √T
   B. T
   C. T2
   D. T3

7. The drying time between fixed moisture content within diffusion controlled ‘falling rate period’ is proportional to (assuming that drying occurs from all surfaces of the solid) (where, T = thickness of the solid) ?

   A. √T
   B. T
   C. T2
   D. T3

8. 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

9. The partial pressure distribution of an ideal gas diffusing through another stagnant ideal gas at steady state follows a/an _________________ law?

   A. Exponential
   B. Parabolic
   C. Linear
   D. Cubic

10. A distillation column with N plates is being operated under normal conditions. At some point of time, the operation is shifted to total reflux condition (i.e., no product and residue are being withdrawn and feed to the column is stopped). At the new steady state ?

    A. Composition of vapors and that of liquid do not vary throughout the column
    B. Reboiler load and condenser load are minimum
    C. The top and bottom compositions are unchanged with and without total reflux
    D. The top and bottom compositions correspond to the maximum enrichment available