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

Discover more Topics under Mass Transfer

01.

Modes and Diffusion

02.

Interphase Mass Transfer

03.

Humidification Operations

04.

Gas Absorption

05.

Distillation

06.

Liquid Extraction

07.

Drying

Q41.

Plait point never occurs in the multistage operations.

True

False

May be True or False

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

The molar concentration at the two points

Length of the diffusion path

Velocity at the point A

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?

D₁ₘ=(N₁-Y₁∑Nⱼ)/(∑(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ)

D₁ₘ=(Y₁∑Nⱼ)/(∑(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ)

D₁ₘ=N₁/(∑[(YⱼN₁-Y₁Nⱼ)/Dᵢⱼ])

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?

Water vapor diffuses through non-diffusing hydrogen and oxygen

Hydrogen and Oxygen is diffusing through water vapor

Hydrogen is diffusing through water vapor and oxygen

None of Hydrogen, Oxygen and water vapor is diffusing

Discuss

Answer: (a).Water vapor diffuses through non-diffusing hydrogen and oxygen

Q45.

0.923,0.267

0.483,1.351

0.294,0.368

1.381,0.364

Discuss

Answer: (a).0.923,0.267

Q46.

1.36*10⁻⁵

1.96*10⁻⁵

1.96*10⁻¹

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 ________

– N flux of A

N flux of A

– N flux of B

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

Infinity

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?

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

Moisture as well as dry air have a sink

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

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

2*10⁻⁶ kmol/s, towards vessel 1

2.5*10⁻⁷ kmol/s, towards vessel 1

5*10⁻⁶ kmol/s, towards vessel 2

9*10⁻⁷ kmol/s, towards vessel 2

Discuss

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

Page 5 of 8

Diffusion in Solids,Liquids and Gases MCQs | Page 5 of 8

Discover more Topics under Mass Transfer

Modes and Diffusion

Interphase Mass Transfer

Humidification Operations

Gas Absorption

Distillation

Liquid Extraction

Drying