VTU Mechanical Engineering (Semester 7)
Cryogenics
December 2016
Total marks: --
Total time: --
INSTRUCTIONS
(1) Assume appropriate data and state your reasons
(2) Marks are given to the right of every question
(3) Draw neat diagrams wherever necessary


1(a) What is Cryogenics? Mention the few areas involving cryogenic enginnering.
6 M
1(b) Discuss the effects of low tempreature on the following properties of engineering materials:
i) Yield strength
ii) Thermal conductivity.
6 M
1(c) Explain thermo dynamically ideal gas liquidification system with sketch and obtain an expression for the work requirement.
8 M

2(a) With a neat sketch and T - S diagram, explain Linde dual pressure system for the liquification of air and write the expression for liquid yield and work requirement per unit mass of air compressed.
10 M
2(b) Explain the working of Simon - Helium liquification system with a neat sketch and represent the processes on T-S diagram.
10 M

3(a) How the cryo coolers are classified? Explain strilling cycle cryo refrigerator, with neat sketch and write the cop for same.
10 M
3(b) Explain with neat sketch and T - S diagram the working of Solvay cycle refrigerator.
10 M

4(a) With a neat sketch, expaln Linde single column gas separation system.
10 M
4(b) What are the gas purification methods? Explain with neat sketch, adsorption purifier along with refrigeration purifier.
10 M

5(a) Explain H3e - H 4e dilution refrigerator, with the sketch indicating all the parts.
10 M
5(b) Sketch and explain the following:
i) Constant volume gas thermometer
ii) Electrical resistance liquid level gauge.
10 M

6(a) How the degrees of vaccum is specified?
4 M
6(b) With a neat sketch, explain the working of mechanical vaccum pump.
8 M
6(c) Explain any four types of insulation that can be used in cryogenic equipment.
8 M

7(a) With a neat sketch, explain various elements of dewor vessel for storage of cryogenic fluid.
8 M
7(b) Write a note on suspension systems adopted in cryogenic engineering.
6 M
7(c) What are the system adopted to transfer the cryogenic fluid? Explain any two.
6 M

8 Write short notes on the application of cryogenic system on: a) Space technology.
b) Super conducting devices.
c) Instant quick freezing technique.
d) Food preservation.
20 M



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