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The following physics responses are provided by a student and, as such, should be considered in that context. While every effort is made for accuracy, absolute correctness cannot be fully guaranteed.
| Question | |
C | 12 |
I | |
Question An electrical power plant manages to send 88% of the heat produced in the burning of fossil fuel into the water-to-steam conversion. Of the heat carried by the steam, 40% is converted to the mechanical energy of the spinning turbine. Which of the following choices best describes the overall efficiency of the heat-to-work conversion in the plant (as a percentage)?
1) greater than 88%
2) 64%
3) less than 40%
4) 40%
5) 53% | |
Answer less than 40% | |
Notes
| User | Added | Note | e | d |
|---|---|---|---|---|
| KillGorack | 2023-07-11 19:20:37 | The overall efficiency of the power plant can be calculated by multiplying the efficiencies of each step in the process. In this case, 88% of the energy from burning the fossil fuel is transferred into the steam, and then 40% of that energy is converted to mechanical energy. So the overall efficiency is: Overall efficiency = 0.88 * 0.40 = 0.352 So the overall efficiency of the heat-to-work conversion in the plant is 35.2%. |
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