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 5 of 8

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Q41.
Plait point never occurs in the multistage operations.

a.

True

b.

False

c.

May be True or False

d.

Can't say

Discuss
Answer: (b).False
Q42.
A mixture undergoing multicomponent diffusion is analyzed through the Maxwell-Stefan approach. With regard to this approach which among the following statements are incorrect? The difference in the partial pressure of the Component A over a small distance ∆z (AB) is proportional to

a.

The molar concentration at the two points

b.

Length of the diffusion path

c.

Velocity at the point A

d.

Difference in the velocities at point A and B

Discuss
Answer: (c).Velocity at the point A
Q43.
If all the components except 1 of the multicomponent diffusing mixture are inert, then what will be the expression for Diffusivity of component 1 in the mixture?

a.

D₁ₘ=(N₁-Y₁∑Nⱼ)/(∑(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ)

b.

D₁ₘ=(Y₁∑Nⱼ)/(∑(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ)

c.

D₁ₘ=N₁/(∑[(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ])

d.

D₁ₘ=(1-Y₁)/(∑[Yⱼ/Dᵢⱼ])

Discuss
Answer: (d).D₁ₘ=(1-Y₁)/(∑[Yⱼ/Dᵢⱼ])
Q44.
A mixture of 60% hydrogen and 40% oxygen is blowing over a pan of water at 1atm pressure. The bulk gas temperature is 30°C and the water temperature is 20°C. The vapor pressure of water at this temperature is 17.53mm Hg. The concentration of moisture in the bulk gas is negligible and the diffusivity values are DO₂-H₂O=0.357cm²/s, DH₂-H₂O=0.972cm²/s at 34°C and DH₂-O₂=0.891cm²/s at 43°C.

Which of the following statements are correct?

a.

Water vapor diffuses through non-diffusing hydrogen and oxygen

b.

Hydrogen and Oxygen is diffusing through water vapor

c.

Hydrogen is diffusing through water vapor and oxygen

d.

None of Hydrogen, Oxygen and water vapor is diffusing

Discuss
Answer: (a).Water vapor diffuses through non-diffusing hydrogen and oxygen
Q45.
A mixture of 60% hydrogen and 40% oxygen is blowing over a pan of water at 1atm pressure. The bulk gas temperature is 30°C and the water temperature is 20°C. The vapor pressure of water at this temperature is 17.53mm Hg. The concentration of moisture in the bulk gas is negligible and the diffusivity values are DO₂-H₂O=0.357cm²/s, DH₂-H₂O=0.972cm²/s at 34°C and DH₂-O₂=0.891cm²/s at 43°C.

What will be the values of the diffusivities (in cm²/s) at the mean gas-film temperature?

a.

0.923,0.267

b.

0.483,1.351

c.

0.294,0.368

d.

1.381,0.364

Discuss
Answer: (a).0.923,0.267
Q46.
A mixture of 60% hydrogen and 40% oxygen is blowing over a pan of water at 1atm pressure. The bulk gas temperature is 30°C and the water temperature is 20°C. The vapor pressure of water at this temperature is 17.53mm Hg. The concentration of moisture in the bulk gas is negligible and the diffusivity values are DO₂-H₂O=0.357cm²/s, DH₂-H₂O=0.972cm²/s at 34°C and DH₂-O₂=0.891cm²/s at 43°C.

What is the value of the flux (kmol/m³.s) of water vapor through a stagnant film of estimated thickness 1.5mm on the water surface?

a.

1.36*10⁻⁵

b.

1.96*10⁻⁵

c.

1.96*10⁻¹

d.

1.96*10⁻⁷

Discuss
Answer: (b).1.96*10⁻⁵
Q47.
For a steady state equimolar counter diffusion of A and B. The N flux of A is ________

a.

– N flux of A

b.

N flux of A

c.

– N flux of B

d.

N flux of B

Discuss
Answer: (c).– N flux of B
Q48.
The value of a ratio of N flux of A to the total N flux for a steady state equimolar counter diffusion is

a.

0

b.

Infinity

c.

1

d.

None of the mentioned

Discuss
Answer: (b).Infinity
Q49.
In sulphuric acid plants dry air is used for burning of sulphur. Air is dried in contact with concentrated Sulphuric acid. Moisture diffuses through a layer of air, reaches the surface and gets absorbed in it. Here air is said to be non-diffusing were as moisture is diffusing. Which of the following statements are correct?

a.

Moisture has a source and a sink whereas dry air has a source but no sink

b.

Moisture as well as dry air have a sink

c.

Moisture has a source but no sink whereas dry air has a source as well as sink

d.

Moisture as well as dry sir have no sink

Discuss
Answer: (a).Moisture has a source and a sink whereas dry air has a source but no sink
Q50.
Consider steady-state equimolar counterdiffusion through the converging-diverging tube. Given: r₁=1cm; r₂=2cm; Nᴀ=10⁻⁶ kmol/m².s at the vessel 1 end of the tube. The rate of transport of B at the vessel 2 end of the tube is

a.

2*10⁻⁶ kmol/s, towards vessel 1

b.

2.5*10⁻⁷ kmol/s, towards vessel 1

c.

5*10⁻⁶ kmol/s, towards vessel 2

d.

9*10⁻⁷ kmol/s, towards vessel 2

Discuss
Answer: (b).2.5*10⁻⁷ kmol/s, towards vessel 1
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