F G1201 Pages: 2

Reg No.:_ Name:

APJ ABDUL KALAM TECHNOLOGICAL UNIVERSITY
SEVENTH SEMESTER B.TECH DEGREE EXAMINATION(S), MAY 2019

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 (a) Explain the various properties of Helium IV? (5)

(b) Explain how the ultimate and yield strengths of engineering materials change (5)

with cryogenic temperature?

2 ക്ര What is Debye characteristic temperature? (3)
(b) What is super conductivity? (3)
(c) Explain the application of cryogenics in the field of electronics industry. (4)
3 (a) Explain the significance of inversion temperatures of gases. (3)
(b) Illustrate the working of a simple cascade gas liquefaction system. (3)

(c) Explain the working of Precooled Linde Hampson System? Derive the (4)
expression for liquid yield for the precooled system.
4 (൮ Compare Claude Liquefaction system and Linde Hampson Liquefaction (4)
systems.
(b) Explain the use of a precooling system in Linde Hampson gas liquefaction (3)
systems.
(c) Draw and explain the T-P diagram for a real gas. (3)
PART 13
Answer any three full questions, each carries 10 marks.
5 (9) With a neat sketch, explain any one system for the liquefaction of Hydrogen. Derive (8)
expressions for liquid yield and work of liquefaction.
(b) Name the important critical components of gas liquefaction systems. (2)
6 (a) Explain the significance of heat exchanger effectiveness on the performance of a (5)
cryogenic liquefier.
(b) What is the significance of ortho to para conversion during the liquefaction of (5)

hydrogen?

7 (8) Prove that COP of an ideal Stirling cycle refrigerator is same as that of Carnot (4)

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