Q. The velocity of various components of mixture(21% A, 78% B and 1% C) are:
Velocity is in the form: v=xi+yj+zk

Velocity of component A= (0.1, 0, 0)

Velocity of component B= (0, 0.1, 0)

Velocity of component B= (0, 0, 0.1)

Calculate the value of mass average velocity?

View solution

Q. For the calculation of Mass average velocity, which velocity of the molecule is used?

View solution

Q. Which among the following can be the unit of Flux?

View solution

Q. A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5 mol/liter. A observer is running in (-x) direction with a velocity of 2m/s. calculate the value of molar flux (mol/m².s) relative to the observer.

View solution

Q. A molecule in a mixture moves with a velocity of 0.03m/s in (+x) direction. The concentration of the particle is 0.5 mol/liter. A observer is running in (-x) direction with a velocity of 2m/s. What will be the value of flux (mol/m².s) with respect to a stationary observer?

View solution

Q. Under which of the following conditions mass average velocity and molar average velocity are equal?

View solution

Q. The mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm². Calculate the value of flux (kg/cm².s) through the cross-section.

View solution

Q. Fick’s law is given by the formula

View solution

Q. What is the unit of diffusion coefficient?

View solution

Q. What is the molecular weight of ammonia?

View solution

Q. What is the molecular volume of air at normal boiling point?

View solution

Q. What is the value of Schmidt number for hydrogen?

View solution

Q. Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.

For ammonia,

Molecular weight = 17
Molecular volume = 25.81 cm³/gm mole

For air,
Molecular weight = 29

View solution

Q. Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents are
O₂ = 0.18

N₂ = 0.72

CO = 0.10

The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values are

D CO = 18.5 * 10⁻⁶ m²/s at 273 K, 1 atm

D CN = 19.2 * 10⁻⁶ m²/s at 288 K, 1 atm

The C is carbon monoxide, O is oxygen and N is nitrogen.

View solution

Q. What is the molecular weight of Sulphur-dioxide?

View solution

Q. The dimension of diffusion coefficient is given by

View solution

Q. For what kind of mixtures Dᴀв=Dвᴀ holds?

View solution

Q. In the expression for molar flux Nᴀ=(Nᴀ+Nв)Cᴀ/C – DᴀвdCᴀ/dz, the terms representing bulk flow and molecular diffusion are, respectively

View solution

Q. Consider loss of ethanol vapor by diffusion from a half-filled open test tube. At what point in the diffusion path will the contribution of the bulk flow term to the molar flux be maximum?

View solution

Q. A reaction 3A+2B+C=1.5D+E occurs in a reactor at steady state. What will be the value of the flux ratio Nᴀ/Nᴅ

View solution