★Specialized Examination for Chemical Engineering ★ — One question per day (2016-1-19) — Points are awarded for participation
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Points system for the daily question: Participation – 1~3 points; Correct answer – 5 points; In-depth analysis – 5~10 points. The answer is provided the next day. Due to limited capabilities, I am unable to provide more in-depth explanations for each question; therefore, on the second day, in addition to offering reference options, I will also remove the restriction on reading replies. I hope that all candidates can learn from one another and improve together! Daily Question (2016-1-19): 1. For compressible fluids, the calculation of fluid density can be simplified. Which of the following simplification rules is correct? A: When the pressure drop is less than 10% of the inlet pressure, use the density corresponding to the inlet conditions. B: When the pressure drop is more than 10% but less than 40% of the inlet pressure, use the average density of the inlet and outlet conditions. C: When the pressure drop is more than 40% of the inlet pressure, consider using the inlet density. D: When the pressure is very high, the change in density is minimal; gas flow can be treated using the principles of incompressible fluid flow. Answer: AD
A, B, D, ———————– ———————– ———————–
USA~~~~~~~~~~~~~~
1. For compressible fluids, the calculation of fluid density can be simplified. Which of the following simplification rules is correct? A: When the pressure drop is less than 10% of the inlet pressure, use the density corresponding to the inlet conditions. B: When the pressure drop is more than 10% but less than 40% of the inlet pressure, use the average density of the inlet and outlet conditions. C: When the pressure drop is more than 40% of the inlet pressure, consider using the inlet density. D: At very high pressures, the change in density is minimal; gas flow can be handled using the principles of incompressible fluid flow
The answers are ABD. A: When the pressure drop is less than 10% of the inlet pressure, use the density under inlet conditions or outlet conditions. B: When the pressure drop is greater than 10% but less than 40% of the inlet pressure, use the average density of the inlet and outlet conditions. D: When the pressure is very high, the density changes little, and gas flow can be treated using the methods applicable to incompressible fluid flow