Mass transfer co-efficient is defined as__________________?

Related Mcqs:

1. According to the film theory of mass transfer, the mass transfer co-efficient is proportional to (where, D = molecular diffusivity) ?

   A. D B. D2 C. D0.5 D. 1/D...

2. For experimental determination of mass transfer co-efficient by wetted wall tower, the mass transfer area is___________________?

   A. Calculated B. Unknown C. Known D. Not required...

3. Mass transfer co-efficient ‘K’ according to penetration theory varies with mass diffusivity as____________________?

   A. D0.5 B. D C. 1/D D. D1.5...

4. For the gas absorption, the height of a transfer unit, based on the gas phase is given by (G: superficial molar gas velocity, L: superficial molar liquid velocity, FG: mass transfer co-efficient, moles/m2, a: interfacial area per unit volume of tower) ?

   A. G/(FG . a) B. FG/(G . a) C. (G . a)/FG D. L/(FG . G)...

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 mass transfer co-efficient for a solid sphere of radius ‘a’ dissolving in a large volume of quiescent liquid, in which „D’ is the diffusivity of solute, is _____________________?

   A. D/a B. D/2a C. Proportional to √D D. Dependent on the Reynolds number...

7. Penetration theory relates the average mass transfer co-efficient (K) with diffusivity D. as____________________?

   A. K ∝D B. K ∝√D C. K ∝D1.5 D. K ∝D2...

8. Mass transfer co-efficient is directly proportional to DAB according to the __________ theory?

   A. Film B. Penetration C. Surface-renewal D. None of these...

9. Which of the following is not a unit of mass transfer co-efficient ?

   A. Moles transferred/ [(time) (area) (mole fraction)] B. Moles transferred/ [(time) (area) (mass A/mass B)] C. Moles transferred/ [(time) (area) (pressure)] D. None of these...

10. Mass transfer co-efficient of liquid is____________________?

    A. Affected more by temperature than that for gases B. Affected much less by temperature than that for gases C. Not affected by the temperature D. None of these...