Engineering Thermodynamics
Isochoric process is one in which

All parameters remain constant
No mechanical work is done by the system
Free expansion takes place
Very little mechanical work is done by the system

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Engineering Thermodynamics
Otto cycle consists of

One constant pressure, one constant volume and two isentropic processes
Two constant volume and two isentropic processes
Two constant pressure and two isentropic processes
Two constant volume and two isothermal processes

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