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
O₂, N₂, water vapour
SO₂, NH₃, CO₂, moisture

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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)

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

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Engineering Thermodynamics
Which is the incorrect statement about Carnot cycle?

It provides concept of maximising work output between the two temperature limits
All the heat engines are based on Carnot cycle
It is used as the alternate standard of comparison of all heat engines
All of these

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