Modes and Diffusion MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Modes and Diffusion, a fundamental topic in the field of Mass Transfer. Whether you're preparing for competitive exams, honing your problem-solving skills, or simply looking to enhance your abilities in this field, our Modes and Diffusion MCQs are designed to help you grasp the core concepts and excel in solving problems.

In this section, you'll find a wide range of Modes and Diffusion mcq questions that explore various aspects of Modes and Diffusion problems. Each MCQ is crafted to challenge your understanding of Modes and Diffusion principles, enabling you to refine your problem-solving techniques. Whether you're a student aiming to ace Mass Transfer tests, a job seeker preparing for interviews, or someone simply interested in sharpening their skills, our Modes and Diffusion MCQs are your pathway to success in mastering this essential Mass Transfer topic.

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Modes and Diffusion MCQs | Page 5 of 12

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Q41.
Which among the following is the statement of the ‘Fick’s Law’?

a.

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

b.

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

c.

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

d.

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

Discuss
Answer: (a).The molar flux of species relative to an observer moving with the molar average velocity is proportional to the concentration gradient of the species.
Q42.
The gas A diffuses through non-diffusing B from point 1 to point 2. The total pressure is 2atm and yᴀ₁=0.1 and yᴀ₂=0.Then the ratio (dPᴀ/dz)1/(dPᴀ/dz)2 is

a.

10

b.

1.11

c.

0.9

d.

2.3

Discuss
Answer: (c).0.9
Q43.
In industries titanium is hardened through diffusion of carbon. The concentration of carbon at 1mm into the surface of the titanium slab is 0.25kg/m³ and at 3mm the concentration is 0.68kg/m³. The rate at which the carbon is entering into its surface is 1.27*10⁻⁹kg/m².s. Calculate the value of diffusion coefficient of carbon.

a.

5.91*10⁻¹²

b.

5.91*10⁻¹⁰

c.

5.91*10⁻¹¹

d.

5.91*10⁻¹³

Discuss
Answer: (a).5.91*10⁻¹²
Q44.
The mass transfer by convection can take place under how many conditions?

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
Q45.
Lewis number is given by

a.

4 α/D

b.

3 α/D

c.

2 α/D

d.

α/D

Discuss
Answer: (d).α/D
Q46.
Prandtl number is given by

a.

V/α

b.

2 V/α

c.

3 V/α

d.

4 V/α

Discuss
Answer: (a).V/α
Q47.
Schmidt number is given by

a.

2 V/D

b.

D/V

c.

V/D

d.

2 D/V

Discuss
Answer: (c).V/D
Q48.
Sherwood number is given by

a.

3/2 hₘ L/D

b.

½ hₘ L/D

c.

3 hₘ L/D

d.

hₘ L/D

Discuss
Answer: (d).hₘ L/D
Q49.
The solution for velocity, concentration and temperature boundary layers will be same if

a.

Prandtl number = Schmidt number= Lewis number

b.

Prandtl number = 2 Schmidt number= Lewis number

c.

Prandtl number = Schmidt number= 2 Lewis number

d.

2 Prandtl number = Schmidt number= Lewis number

Discuss
Answer: (a).Prandtl number = Schmidt number= Lewis number
Q50.
Convective mass transfer involves the transportation of material between a boundary surface and a moving fluid or between two immiscible fluids. It is prescribed by the relation

a.

2 hₘ (d Cв)

b.

½ hₘ (d Cв)

c.

hₘ (d Cв)

d.

3/2 hₘ (d Cв)

Discuss
Answer: (c).hₘ (d Cв)
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