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.

Note: Each of the following question comes with multiple answer choices. Select the most appropriate option and test your understanding of Modes and Diffusion. You can click on an option to test your knowledge before viewing the solution for a MCQ. Happy learning!

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Modes and Diffusion MCQs | Page 3 of 12

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Discuss
Answer: (d).In dilute solutions as well as in solutions in which all components have same molecular weights
Q22.
The mass flow rate of a component in a mixture in X-direction is 2kg/s. The area vector at a particular cross-section is (1.1, 3.2, 5.4) cm². Calculate the value of flux (kg/cm².s) through the cross-section.
Discuss
Answer: (c).1.82
Discuss
Answer: (a).N b = – D b c d C b/d x
Q24.
What is the unit of diffusion coefficient?
Discuss
Answer: (d).m²/s
Q25.
What is the molecular weight of ammonia?
Discuss
Answer: (c).29
Q26.
What is the molecular volume of air at normal boiling point?
Discuss
Answer: (a).29.89 cm³/gm mole
Q27.
What is the value of Schmidt number for hydrogen?
Discuss
Answer: (b).0.22
Q28.
Estimate the diffusion coefficient for ammonia in air t 25 degree Celsius temperature and one atmospheric pressure.

For ammonia,

Molecular weight = 17
Molecular volume = 25.81 cm³/gm mole

For air,
Molecular weight = 29
Discuss
Answer: (d).0.1880 cm²/s
Q29.
Estimate the diffusion coefficient of carbon monoxide through air in which the mole fractions of each constituents are
Oβ‚‚ = 0.18

Nβ‚‚ = 0.72

CO = 0.10

The gas mixture is at 300 K and 2 atmosphere total pressure. The diffusivity values are

D CO = 18.5 * 10⁻⁢ m²/s at 273 K, 1 atm

D CN = 19.2 * 10⁻⁢ m²/s at 288 K, 1 atm

The C is carbon monoxide, O is oxygen and N is nitrogen.
Discuss
Answer: (a).10.29 * 10⁻⁢ m²/s
Q30.
What is the molecular weight of Sulphur-dioxide?
Discuss
Answer: (c).64