Engineering Thermodynamics
Diesel cycle consists of following four processes

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

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Engineering Thermodynamics
Gases have

No value of specific heat
Two values of specific heat
Only one value of specific heat
Under some conditions one value and sometimes two values of specific heat

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