Question -
Which of the following cycles uses air as the refrigerant?
Options:
A .  Ericson
B .  Stirling
C .  Carnot
D .  Bell Coleman
Answer: Option D The Bell Coleman Cycle also called as the Joule or "reverse" Brayton cycle. it is a refrigeration cycle where the working fluid is a gas that is compressed and expanded, but does not change phase.
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