Mass Transfer Practice Test 1

1. Sherwood number is given by

2. For a binary mixture of species A and B, the molar average velocity is defined as

3. Lewis number is given by

4. Figure shows equimolal diffusion between species B and C. Identify the correct molar diffusion rate

5. For a binary mixture of species A and B, the mass average velocity is defined as

6. What is the molecular weight of ammonia?

7. For a component A of a mixture, concentration as a function of x is given:
C_A=5e^-10x (x is in cm and C_A in mol/liter)
Calculate the value of diffusion velocity (m/s)of the component A at the point x=0, if diffusivity of A in the mixture is 2.567*10^-5m²/s.

8. At which condition molar flux with respect to a stationary observer and with respect to an observer moving with molar average velocity?

9. The dimension of diffusion coefficient is given by

10. In the expression for molar flux N_A=(N_A+N_B)C_A/C - D_ABdC_A/dz, the terms representing bulk flow and molecular diffusion are, respectively