Engineering Thermodynamics
Diesel cycle consists of following four processes

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

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Engineering Thermodynamics
The specific heat at constant volume is

The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant pressure
The amount of heat required to raise the temperature of 1 kg of water through one degree
Any one of the above
The amount of heat required to raise the temperature of unit mass of gas through one degree, at constant volume

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