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10000ME467122001

Prove that COP of an ideal Stirling cycle refrigerator with perfect regeneration
is the same as that of Carnot refrigerator.
Explain the working of a Claude refrigerator. Derive an expression for COP of
Claude refrigerator considering the compressor and expander efficiencies.
Discuss, with a suitable example, the effect of regenerator effectiveness on the
performance of a cryogenic refrigerator.
Discuss the working of a magnetic refrigerator.
PART ^

Answer any four full questions, each carries 10 marks.
Explain with the help of a diagram, a typical storage vessel for a cryogenic
liquid.
Explain different types of cryogenic insulation materials and compare their
performance.
What are the factors to be considered for selecting insulation for a particular
application?
Explain the features of cryogenic fluid transfer systems
Explain the measurement of temperature using 1. Resistance thermometer
2. Magnetic thermometer.
Explain with the help of diagrams any two methods of cryogenic liquid level
measurement.
Briefly mention the different non-storage type heat exchangers used in
cryogenic equipment.
Explain cryo-pumping and its application.

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