Engineering Thermodynamics
Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits?

O₂, N₂, steam, CO₂
O₂, N₂, H₂, air
SO₂, NH₃, CO₂, moisture
O₂, N₂, water vapour

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Engineering Thermodynamics
Otto cycle consists of

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

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