[Daily Test Question 077] Basic knowledge of automatic control systems

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This post was last edited by oatobnus at 2009-11-20 09:43.: 1. For a double-lever structure force balance pressure transmitter, when a migration spring is used for zero point migration, its output characteristics () A. The slope remains unchanged and the range changes. ； B. The slope changes, but the measuring range remains unchanged. ； C. The slope and range remain unchanged. ； 2. Flow refers to () A. The amount of fluid flowing through a certain section of the pipeline per unit time B. The amount of fluid flowing through a certain section of the pipeline per unit time C. The amount of fluid flowing through a certain section of the pipeline within a period of time D. The amount of fluid flowing through a certain section of the pipeline within a period of time 3. In order to ensure the stability and safety of production, () is introduced in the analysis and design of the control system A. Detection instrument B Feedback control C Simple control D Experience control 4. In an installed control system, the main things to determine before the system is put into use are the direction of action of () A, the regulating object B, the transmitter C, the regulating valve D, the regulator 5. During maintenance of the instrument power supply system, the corresponding maintenance regulations should be strictly implemented. The following maintenance construction aspects that do not meet the requirements of the regulations are () A. The power supply and power supply line for the instrument can only be inspected and repaired when the device is shut down. Under normal circumstances, maintenance only needs to be strengthened, and construction inspections are not allowed. B. Repair work must be carried out by experienced instrument professionals. C. The output voltage stability of the power box should meet the technical requirements of 24V ± 0.24V, and the effective value of the microwave voltage is less than 48mV. D. The inside of the power box can be purged and dusted with industrial wind. Judgment question: 6. The hexadecimal number 1A is equal to the decimal number 26. 7. From a correct instrument control flow chart, instrument information such as the type of transmitter, the mode of action of the regulator, and the form of the actuator can be obtained. 8. SQL language is a procedural language. 9. When the compressor surges, its working point changes back and forth between the surge area and the non-surge area. 10. The electro-hydraulic slide valve has a tracking bandwidth adjustment function, and the adjustment range is 0.5-5% of the input signal change of the measurement range. Reference answer: CABDD True True False True True