Engineering Thermodynamics
Otto cycle consists of following four processes

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

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Engineering Thermodynamics
The universal gas constant (or molar constant) of a gas is the product of

Atomic mass of the gas and the gas constant
Molecular mass of the gas and the specific heat at constant volume
Molecular mass of the gas and the specific heat at constant pressure
Molecular mass of the gas and the gas constant

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