Project ForgeThermodynamics
Entropy & Second Law
GATE 2008
Hard
For the same piston-cylinder process, the heat transfer to the system is 1 kJ, during which the system's own entropy increases by 10 J/K. The reservoir supplying this heat is at 400°C (673K). The net entropy generation (system + reservoir together) during the process is closest to
- A7.5 J/K
- B7.7 J/K
- 8.5 J/K
- D10 J/K
Explanation
ΔS_system=10 J/K (given). ΔS_reservoir=-Q/T_reservoir=-1000/673≈-1.49 J/K. Net Sgen=ΔS_system+ΔS_reservoir=10-1.49≈8.5 J/K.
Source: GATE ME 2008 (2008)
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