A cyclic engine exchanges heat with two reservoirs maintained at 100 and 300°C respectively. The maximum work (in J) that can be obtained from 1000 J of heat extracted from the hot reservoir is_________________?
Correct answer: A. 349
- A. 349
- B. 651
- C. 667
- D. 1000
Explanation
Maximum work is obtained from a reversible Carnot cycle: W = Qh(1 − Tc/Th) = 1000[1 − 373/573] ≈ 349 J. The temperatures must be converted from Celsius to kelvin before applying the efficiency relation.
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