Mass Transfer Mock Test 1

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Question 1 of 10

1. Which among the following is the statement of the ‘Fick’s Law’?

The mass flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.

The molar flux of species relative to an observer moving with the mass average velocity is proportional to the concentration gradient of the species.

The molar flux of species relative to a stationary observer is proportional to the concentration gradient of the species.

The molar flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.

Question 1 of 10

Question 2 of 10

2. What is the molecular weight of ammonia?

Question 2 of 10

Question 3 of 10

3. A binary mixture of oxygen and nitrogen with partial pressures in the ratio 0.21 and 0.79 is contained in a vessel at 300 K. If the total pressure of the mixture is 1 * 10 ⁵ N/m², find molar concentration of oxygen

8.42 * 10^-2 kg mol/m³

8.42 * 10^-4 kg mol/m³

8.42 * 10^-1 kg mol/m³

8.42 * 10^-3 kg mol/m³

Question 3 of 10

Question 4 of 10

4. Which among the following is always true for mass transfer to occur?

Difference in temperature

Difference in chemical potential

Difference in concentration

Difference in Pressure

Question 4 of 10

Question 5 of 10

5. The gas A diffuses through non-diffusing B from point 1 to point 2. The total pressure is 2atm and y_A1=0.1 and y_A2=0.Then the ratio (dP_A/dz)1/(dP_A/dz)2 is

2.3

1.11

0.9

Question 5 of 10

Question 6 of 10

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

n _a V _a + n _b V _b/2 n

n _a V _a + n _b V _b/n

n _a V _a + n _b V _b

n _a V _a + 2 n _b V _b/n

Question 6 of 10

Question 7 of 10

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

29.89 cm³/gm mole

49.89 cm³/gm mole

39.89 cm³/gm mole

59.89 cm³/gm mole

Question 7 of 10

Question 8 of 10

8. The mass transfer by convection can take place under how many conditions?

Question 8 of 10

Question 9 of 10

9. Fick’s law is given by the formula

N _b= - 3 D _{b c}d C _b/d x

N _b= - 2 D _{b c}d C _b/d x

N _b= - D _{b c}d C _b/d x

N _b= - 4 D _{b c}d C _b/d x

Question 9 of 10

Question 10 of 10

10. The solution for velocity, concentration and temperature boundary layers will be same if

2 Prandtl number = Schmidt number= Lewis number

Prandtl number = Schmidt number= 2 Lewis number

Prandtl number = Schmidt number= Lewis number

Prandtl number = 2 Schmidt number= Lewis number

Question 10 of 10