Engineering Thermodynamics
A process, in which the temperature of the working substance remains constant during its expansion or compression, is called

Hyperbolic process
Polytropic process
Isothermal process
Adiabatic process

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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
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

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