Cryogenics Engineering — Winter 2023

Write short note on “Properties of liquid Hydrogen”.

Explain Meissner effect with sketch.

Explain with neat sketch Joule-Thomson refrigeration system

Define superconductivity. What is Type-Iand Type-II superconductors?

Discuss variations of following properties of material at Cryogenic temperature. (a) Fatigue strength (b) Hardness (c) Ductility (d) Ultimate strength

Discuss application of cryogenics in food preservation

Discuss the Applications of cryogenics in superconducting devices.

Explain in brief “Applications of cryogenics in biology and medicine”.

Explain the mechanism of insulation in (a) Opacified powder insulation

Evacuated powder and fibrous insulation

Discuss the application of cryogenics in nuclear propulsions and chemical propulsions.

Write short note on Multilayer Insulation.

Write note on Space simulation chamber

With a neat sketch explain the construction and working of a cryotron

Discuss payoff functions and performance parameters for gas liquefaction systems.

Explain Metallic resistance thermometer used for cryogenic temperature measurement.

Enlist Air separation and purification systems. Explain any one system with diagram

List the types of insulations used in cryogenic equipments

Explain general characteristics of mixtures and draw typical Temperature- composition diagram for binary mixture.

Explain Linde-Bronn system for hydrogen separation.

Draw a neat diagram of dewar vessel showing its elements.

Explain the mechanism of insulation in (a) Opacified powder insulation

Evacuated powder and fibrous insulation1

Explain role of heat exchanger in cryogenic systems. List various configuration of heat exchangers used in cryogenics.

Write short note on vacuum insulation

write desirable features of regenerative heat exchanger of Philips refrigerator.

Explain with neat sketch the different types of cryogenic heat exchangers