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

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Engineering Thermodynamics
Which of the following is the correct statement of the second law of thermodynamics?

It is impossible to transfer heat from a body at a lower temperature to a higher temperature, without the aid of an external source
There is a definite amount of mechanical energy, which can be obtained from a given quantity of heat energy
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
All of these

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