[Daily Question 128] Basic knowledge of automatic control systems (please hide this post)

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This post was last edited by LZ Gas Station at 2010-1-22 07:48. Multiple choice questions: 1. The distance between the pressure pipe supports must comply with the specific provisions of GBJ93-86, that is, 1-1.5m for horizontal laying and 1-1.5m for vertical laying () A, 1-1.55m B, 1.5-2.0m C, 2.0-3.0m D, 3.0-4.0m 2. The new shielded wire used for the instrument is required to be grounded at one end of the operating room. The main purpose is to () A. Reduce magnetic field interference B. Reduce interference from the environment C. Reduce interference from the power supply 3. Distributed control system communication network often uses (). A. Ring shape and star shape B. Bus shape and ring shape C. Bus shape 4. The error caused by the static pressure of the differential pressure transmitter is () A. System error B. Accidental error C. Random error D. Negligent error 5. The feed flow regulating valve should be selected () A. Air-opening type B. Air-closing type C. Determine according to process requirements D. Air-opening and air-closing valves can all be used to determine the question: 6. The DCS card supports hot plugging, so there is no need to wear anti-static equipment when inspecting and plugging the card. 7. The grounding of the non-intrinsically safe line distribution box should be connected to the protective grounding grid. 8. Installing a zirconia oxygen analyzer on the furnace flue is one of the means of energy saving. 9. Temperature pressure compensation of flow rate corrects the system error of the flow measurement. 10. The standard specification of the flange of a certain regulating valve is ANSI1500RJ·3, where ANSI1500 represents its actual working pressure. Reference answer: BBBAA FTTTF