Engineering Thermodynamics
The variables which control the physical properties of a perfect gas are

Temperature of the gas
Pressure exerted by the gas
Volume occupied by the gas
All of these

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

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

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