Project ForgeThermodynamics
Entropy & Second Law
GATE 2010
Medium
Consider the following two processes: (a) A heat source at 1200K loses 2500kJ of heat to a sink at 800K. (b) A heat source at 800K loses 2000kJ of heat to a sink at 500K. Which of the following statements is true?
- AProcess I is more irreversible than Process II
- Process II is more irreversible than Process I
- CIrreversibility associated in both the processes are equal
- DBoth the processes are reversible
Explanation
Entropy generated = Q/Tsink - Q/Tsource for each process. Process I: 2500/800-2500/1200≈1.042 kJ/K. Process II: 2000/500-2000/800=1.5 kJ/K. Since more entropy is generated in Process II, it is more irreversible.
Source: GATE ME 2010 (2010)
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