Download GTU BE/B.Tech 2019 Summer 8th Sem New 2181917 Cryogenic Engineering Question Paper

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Subject Code: 2181917

GUJARAT TECHNOLOGICAL UNIVERSITY

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Instructions:

1. Attempt all questions.
2. Make suitable assumptions wherever necessary.
3. Figures to the right indicate full marks.

1. Explain the concept of ortho-hydrogen and para-hydrogen. [03]

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2. Discuss variations of following properties of material at Cryogenic temperature. (a) Fatigue strength (b) Hardness (c) Ductility (d) Ultimate strength [04]
3. Discuss the unusual properties of liquid Helium-II. [07]
4. Explain Joule Thompson expansion. [03]
5. Explain the mechanism of insulation in (a) Opacified powder insulation (b) Evacuated powder and fibrous insulation [04]
6. Explain role of heat exchanger in cryogenic systems. List various configuration of heat exchangers used in cryogenics. [07]
   

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   OR
   Write comparison between G-M and Philips refrigerator. Also write desirable features of regenerative heat exchanger of Philips refrigerator. [07]
7. Explain in brief vacuum insulated transfer lines. [03]
8. Write a note on Applications of cryogenics in biology. [04]
9. Write short note on Magnetic refrigerator. [07]
   

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   OR
   Explain in brief Multi layer insulation. [07]
10. Explain general characteristics of mixtures and draw typical Temperature-composition diagram for binary mixture:. [03]
11. Enlist Air separation and purification systems. Explain any one system with diagram. [04]
12. Discuss payoff functions and performance parameters for gas liquefaction systems. [07]

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13. Explain Metallic resistance thermometer used for cryogenic temperature measurement. [03]
14. Explain Linde-Bronn system for hydrogen separation. [04]
    OR
    Draw a neat diagram of dewar vessel showing its elements. [07]
15. Explain construction and working of Turbine flow meter with figure. [03]

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16. Explain working of capacitance liquid level probe with figure. [04]
17. What is superconductivity? Briefly explain Type-I and Type-II superconductors. [07]
18. Discuss in brief hazard due to (a) flammability (b) high pressure gas (c) material of construction (d) personal exposure hazard. [03]
19. Discuss the Applications of cryogenics in superconducting devices. [04]
    OR
    

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    Briefly describe space simulation chamber. [07]
20. Discuss safety criteria to be considered while handling cryogens. [03]
21. Discuss application of cryogenics in food preservation. [04]

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