If a turbine is working as a heat engine and takes heat from a hot body (427 °C) and exhausts it into a body at 77 °C, then what is the possible efficiency?
Correct answer: A. 50%
- A. 50%
- B. 70%
- C. 90%
- D. 95%
Explanation
The efficiency of a Carnot engine is entirely a function of the temperatures of the hot and cold reservoirs you use. It can be calculated using this equation.
This question appeared on the UHS MDCAT 2016 paper, which you can sit online with every answer explained.
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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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