Diffusion in Solids,Liquids and Gases MCQs

Welcome to our comprehensive collection of Multiple Choice Questions (MCQs) on Diffusion in Solids,Liquids and Gases, 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 Diffusion in Solids,Liquids and Gases 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 Diffusion in Solids,Liquids and Gases mcq questions that explore various aspects of Diffusion in Solids,Liquids and Gases problems. Each MCQ is crafted to challenge your understanding of Diffusion in Solids,Liquids and Gases 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 Diffusion in Solids,Liquids and Gases MCQs are your pathway to success in mastering this essential Mass Transfer topic.

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Diffusion in Solids,Liquids and Gases MCQs | Page 7 of 8

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Q61.
In an accident a container containing ethanol(s.g 0.789) falls down in a room of dimension 1*1*2(all in m). Ethanol forms a layer of 2mm. Ethanol vaporizes and diffuses through a stagnant film of air of thickness 2.5mm. What will be the time required for the water layer to disappear completely, if the floor has micro pores and water penetrates the floor at a constant rate of 0.1kg/m²h. The diffusivity of ethanol in air is 2.567*10⁻⁵ m²/s. The total pressure is 1.013 bar and the pressure of ethanol in bulk air is 0.02244 bar and at the ethanol-air interface is 0.02718bar. The temperature is 25.2°C.

a.

3.64h

b.

4.73h

c.

5.94h

d.

2.36h

Discuss
Answer: (a).3.64h
Q62.
The molar average velocity of the components in a binary mixture in which they are in equimolar counter diffusion is

a.

Equal to mass average velocity

b.

Zero

c.

Always negative

d.

Always positive

Discuss
Answer: (b).Zero
Q63.
A cylinder of sulfur is kept in a large volume of stagnant air for sublimation. How much time will be required for its complete sublimation?

a.

One fourth the time required by sphere of same mass

b.

Half the time required by a cube of same mass

c.

One fourth the time required by a cube of same mass

d.

Infinite

Discuss
Answer: (d).Infinite
Q64.
For a gas mixture (A+B) equimolar counterdiffusion takes place. Which among the following statements are correct for molar flux?

a.

If temperature is doubled, the flux will get halved

b.

If diffusion length is halved, the flux will get halved

c.

If temperature is halved, the flux will get halved

d.

If temperature is doubled and length is halved, the flux will become four times

Discuss
Answer: (a).If temperature is doubled, the flux will get halved
Q65.
Find the number of stages.

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (c).3
Q66.
Find the process.

a.

Multistage cross flow

b.

Single stage cross flow

c.

Multistage counter flow

d.

Single stage counter flow

Discuss
Answer: (a).Multistage cross flow
Q67.
From the figure find the extract positions.

a.

A,B

b.

X,Y

c.

A,Y

d.

X,B

Discuss
Answer: (b).X,Y
Q68.
Find the number of stages.

a.

1

b.

2

c.

3

d.

4

Discuss
Answer: (b).2
Q69.
Look at the operating line which represents?

a.

Co-current process

b.

Counter current process

c.

Cross flow process

d.

Other process

Discuss
Answer: (b).Counter current process
Q70.
Can we able to find the extract at the second stage with the known values of E1, R1, S2.

a.

Yes

b.

No

c.

May be Yes or No

d.

Can't say

Discuss
Answer: (b).No
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