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

Related Mcqs:

1. 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

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. 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

4. Steady state equimolal counter diffusion occurs in case of ____________________?

   A. Leaching
   B. Absorption
   C. Binary phase distillation
   D. Liquid-liquid extraction

5. 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

6. Ordinary diffusion process is also called ______________ diffusion?

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

7. Component A is diffusing in a medium B. The flux NA relative to a stationary point is equal to the flux due to molecular diffusion, if____________________?

   A. Mass transfer is accompanied by reaction
   B. Diffusion of A is in stagnant medium B
   C. Molecular mean free path is high
   D. There is equimolar counter diffusion

8. 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

9. Molecular diffusion is caused by the________________?

   A. Transfer of molecules from low concentration to high concentration region
   B. Thermal energy of the molecules
   C. Activation energy of the molecules
   D. Potential energy of the molecules

10. Steady state temperature reached by a small amount of liquid evaporating into a large amount of unsaturated vapour-gas mixture is called the ________________ temperature?

    A. Dry-bulb
    B. Wet-bulb
    C. Dew point
    D. Adiabatic saturation