If the temperature of the source of heat decreases while the temperature of the sink remains constant,then the efficiency of a carrot engine
Correct answer: B. Decreases
- A. Increases
- B. Decreases
- C. Remains the same
- D. Varies unpredictably
Explanation
The efficiency of a Carnot engine is calculated using the formula: efficiency = 1 - (T_sink / T_source), where T_sink and T_source are the absolute temperatures of the sink and source, respectively. If the temperature of the source decreases while the temperature of the sink remains constant, the ratio T_sink / T_source increases, thereby reducing the efficiency. Therefore, the correct answer is that the efficiency decreases. Options A and C are incorrect because the efficiency is influenced by changes in temperature difference. Option D is incorrect because the efficiency change is predictable based on the established formula.
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About First Law of Thermodynamics
The first law relates heat supplied, work done and the change in internal energy through energy conservation. Problems use sign conventions and apply the law to isothermal, adiabatic, isobaric and isochoric processes. Internal energy is a state function, while heat and work depend on the path followed.
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