00000ME467121902 Pages: 2

Reg No.: Name:
APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY

Seventh Semester B.Tech Degree Regular and Supplementary Examination December 2021 (2015 Scheme)

Course Code: ME467
Course Name: Cryogenic Engineering
Max. Marks: 100 Duration: 3 Hours
PARTA
Answer any three full questions, each carries 10 marks. Marks
1 98) Discuss the role of cryogenics in i) Biology and medicine ii) Food industry. (3)

b) Differentiate between Type I and Type 11 superconductors. Briefly explain any (7)
three applications of superconductivity.
2 a) Sketch and explain the p-T diagram of helium-4. Indicate lambda line, lambda (5)
point and critical point on the diagram and explain their significance.
b) Explain ortho-para conversion for hydrogen. Discuss the importance of a (5)
catalyst in the conversion process.
3 923) Discuss the importance of inversion temperature in liquefaction of gases. (3)
b) With a neat sketch explain the working of a cascade liquefaction system for (7)
nitrogen.
4 With a schematic and T-s diagram explain the working of a precooled Linde- (10)
Hampson system. Derive an expression for the liquid yield.
PART ‏تا‎
‎Answer any three full questions, each carries 10 marks.
5 With a neat sketch and T-s diagram explain the working of Collins helium (10)
liquefaction system.
6 Draw the schematic and T-s diagram and explain the working of the Simon (10)
helium liquefaction system.
7 ஐ Explain the significance of regenerators in a Philips refrigerator. (4)
b) With a neat sketch and T-s diagram, explain the working of a Linde-Hampson (6)
refrigerator.
8 Describe adiabatic demagnetization process. With the help of a schematic and (10)

T-s diagram explain the working of a magnetic refrigerator.

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