Engineering Thermodynamics
If a gas vapour is allowed to expand through a very minute aperture, then such a process is known as

Adiabatic expansion
Throttling
Hyperbolic expansion
Free expansion

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Engineering Thermodynamics
In order that a cycle be reversible, following must be satisfied

When heat is being absorbed, temperature of hot source and working substance should be same
When beat is being rejected, temperature of cold source and working substance should be same
Free expansion or friction resisted expansion/compression process should not be encountered
All of these

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