Gaseous diffusion co-efficient increases with increase in the_____________________?

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. Ordinary diffusion process is also called ______________ diffusion?

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

3. Diffusion co-efficient generally depends upon the temperature, pressure & the nature of the components of the system. Its dimension is not the same as that of the_________________?

   A. Mass transfer co-efficient
   B. Thermal diffusivity
   C. Kinematic viscosity
   D. Volumetric diffusivity

4. The diffusion co-efficient in m2/s. of acetic acid in benzene (liquid in liquid) is___________________?

   A. 2.09 × 10-4
   B. 2.09 × 10-5
   C. 2.09 × 10-9
   D. 2.09 × 10-12

5. 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

6. The Reynolds number of the liquid was increased 100 fold for a laminar falling film used for gas-liquid contacting. Assuming penetrating theory is applicable, the fold increase in the mass transfer co-efficient (Kc) for the same system is_______________________?

   A. 100
   B. 10
   C. 5
   D. 1

7. For absorbing a sparingly soluble gas in a liquid, the_____________________?

   A. Gas side co-efficient should be increased
   B. Liquid side coefficient should be increased
   C. Gas side co-efficient should be decreased
   D. Liquid side co-efficient should be decreased

8. Advantage of continuous drying over batch drying is that the_____________________?

   A. Drying cost per unit weight of dried product is less
   B. Product with more uniform moisture content is produced
   C. Equipment size required is smaller
   D. All A , B. & C.

9. Channelling in a packed tower results from the_____________________?

   A. High pressure drop
   B. Maldistribution of liquid
   C. Non-uniformity of packing
   D. Both B. and C.

10. If a two phase system is in physical equilibrium; then it means that, the_____________________?

    A. Escaping tendency of each component from the liquid phase to the vapor phase is exactly
    equal to that from vapor phase to liquid phase
    B. Temperature of the liquid phase is equal to that of the vapor phase
    C. Total pressure throughout the liquid phase is equal to that throughout the vapor phase
    D. All A., B. and C.