Question 63 on the morning of the first day of 2011
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63. Multi-stage compression is often used in the gas compression process. Which of the following statements are correct regarding multi-stage compression? A. When the number of stages is the same, the compression ratio in each stage is equal, resulting in the minimum total compression work. B. When the number of stages is the same, the compression ratio in each stage is equal, resulting in the maximum total compression work. C. When the number of stages is the same but the compression ratios in each stage differ, the total compression work is minimum. D. Compared to single-stage compression, at the same total compression ratio, the sum of the external work required for each stage in multi-stage compression is less than that in single-stage compression. Is BD the correct answer?
Choose AD; when the compression ratios are equal, the shaft work required for each stage is the same, and the total work required is minimized in this case.
Choose AD; refer to the textbook on Chemical Engineering Principles by Tianjin University, pages 135-136 in Volume 1 – it’s basically verbatim
Choose AD; BC is incorrect. It is recommended to consult a textbook on chemical engineering principles