Engineering Thermodynamics
Diesel cycle consists of following four processes

Two isentropic and two constant volumes
Two isentropic, one constant volume and one constant pressure
Two isothermal and two isentropic
Two isentropic and two constant pressures

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

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

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