Question 41 for Professionals on the morning of the first day of 2011
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41. According to different accounting systems, into which categories can material balance equations be divided? A. Overall process balance: Conducts a material balance for a chemical process. B. Component balance: Performs a balance for a specific component within a stream. C. Equipment balance: Conducts a material balance for a chemical equipment unit. D. Node balance: Performs a balance at the mixing and branching points of streams. The correct answers are ABCD, but I don’t think all four options should be chosen, right?
Select all. For AB, it comes down to the two material balance equations of the distillation process; the same applies to CD as well.
Think about it again; it seems that B cannot be chosen, as the premise of the question is that the accounting systems are distinct from each other.
[Analysis] ACD； Depending on the accounting objectives, it can be divided into total mass accounting, component accounting, and element accounting. Depending on the accounting system, it can be divided into overall process accounting, equipment accounting, and node accounting. This type of question is common in exams, and it’s the kind that 90% of people get wrong; it’s important to pay attention to it! It will appear again in future exams!