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This post was last edited by *amingteda on 2017-8-10 at 15:38. Dear fellow users, in order to help everyone learn the *ProII process simulation software better – so that beginners can gain knowledge and experienced users can refresh their skills – we are launching a series of lessons on the basics of ProII titled “Making Progress Every Day”. Since I use Aspen Plus/Hysys more frequently in my daily work, I have not studied the ProII software systematically; therefore, the knowledge I offer might be quite basic. I hope fellow users will provide valuable suggestions and opinions, and actively participate in the discussions. Multiple-choice question: 2. Which of the following statements about thermodynamic models is correct? A. When using simulation software for process simulation, after the user defines a process, the software generally handles the analysis of the process structure and the selection of simulation algorithms on its own; however, the choice of thermodynamic model must be decided by the user. Almost all unit operation models used in process simulation require calculations of thermodynamic properties. To date, no single thermodynamic model can be applied to all substances and all processes. Multiple thermodynamic models are needed in process simulation, and the proper selection and correct use of these models determine the accuracy, reliability of the calculation results, as well as the success of the simulation. The default thermodynamic model cannot guarantee the accuracy of the simulation results. When the C thermodynamic model is not selected properly, the simulation process usually does not produce any error messages. Improper use of the D thermodynamic model can also lead to incorrect results. Answer: ABCD