[Daily Question] Registered Exam Version 2019.08.07

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The ideal flow characteristic of a control valve refers to ( ). A. The relationship between the relative flow rate through the valve and the relative opening degree of the valve when the pressure difference before and after the valve remains constant. B. The relationship between the relative flow rate through the valve and the relative opening degree of the valve when the pressure difference across the valve changes. C. The relationship between the value of the controlled variable and the relative opening degree of the control valve when the pressure difference before and after the valve remains constant. D. The relationship between the controller’s output and the relative opening degree of the control valve when the pressure difference across the valve changes. The reference answers can be seen after clicking *Reply*; scoring is possible by identifying the key points. Answer: A is correct. 3 points for correctness, 1 point for error. For mass posting, the lowest score is assigned ； Replies that are unrelated to the answer are considered spam and will be deleted immediately.