Engineering Thermodynamics
Otto cycle consists of

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

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Engineering Thermodynamics
Work-done during adiabatic expansion is given by (where p1 v1, T1 = Pressure, volume and temperature for the initial condition of gas, p2, v2, T2 = Corresponding values for the final condition of gas, R = Gas constant, and γ = Ratio of specific heats)

(p1 v1 - p2, v2)/(γ - 1)
[m R T1/(γ - 1)][1 - (p2, v2 /p1 v1)]
All of these
[m R (T1 - T2)] /(γ - 1)

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