Molecular diffusion is caused by 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. 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...

4. 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...

5. 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...

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. 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...

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...