## Engineering Thermodynamics In a free expansion process

Work done is zero but heat increases
Heat transfer is zero
Both (A) and (B) above
Work done is zero

0.24
0.17
1.41
0.1

40°C
20°C
0°C
80°C

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

## Engineering Thermodynamics According to Kelvin-Planck’s statement of second law of thermodynamics,

It is possible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy into work
It is impossible to construct a device which operates in a cyclic process and produces no effect other than the transfer of heat from a cold body to a hot body
None of these