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
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
All of these

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Engineering Thermodynamics
First law of thermodynamics

Does not enable to determine change in entropy
All of these
Enables to determine change in internal energy of the system
Provides relationship between heat, work and internal energy

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