【Daily Quiz 038】Basic Knowledge of Control Systems (Please hide the answer)

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This post was last edited by LZ Gas Station on 2009-9-16 at 08:11. Currently, all members have the permission to use hidden replies; please cooperate actively. No ratings will be given unless replies are not hidden. Out of 10 points, additional points will be given to the top five correct answerers. Also, be careful when posting; edits are invalid! Those with different views on the provided answer keys can post discussions the next day. To hide the method, click here: Hide Method. For multiple accounts on the same IP, only the first response counts as valid. For multiple-choice questions, simply provide the answer code in your reply. 1. In a signal alarm system, the normal state refers to ( ). A. There are no light or sound signals at this time. B. The alarm system returns to normal operation after the fault is resolved. C. After an alarm signal is detected. D. The state in which sound and light signals are emitted when the process parameters being monitored deviate from the specified values or when abnormal operations occur. 2. PCST is a new process control system based on Siemens’ ( ) concept. A. Automation B. Fully integrated automation C. Visualization D. Integration 3. For a tank level control system where it is necessary to prevent the liquid from overflowing, if the inflow rate is chosen as the control variable, determine the type of control valve and the operating mode of the regulator (). A. Air-open, direct-acting B. Air-open, reverse-acting C. Air-close, direct-acting D. Air-close, reverse-acting. 4. Compared with the electro-pneumatic converter, the difference of the valve positioner lies in ( ). A. The input signal is 4–20 mA. B. Accurate positioning is achieved. C. There is a forward and reverse action. D. The principle of force balance is applied. 5. The pressure difference above and below the rotor in a rotameter is determined by ( ). A. Flow velocity of the fluid B. Pressure of the fluid C. Weight of the rotor D. Temperature of the fluid True or False: 6. All alarms for process points can be monitored on the control console. 7. In the No. 7 alarm interlock system, in order to reduce the likelihood of malfunction in the interlock circuits and improve the reliability of their operation, a three-to-two voting circuit can be employed. 8. Control valves should be avoided from operating at low opening degrees for extended periods, as this will result in poor stability of the valve. 9. The solenoid valve can be installed horizontally or vertically. 10. Copper gaskets can be used when measuring acetylene pressure. Answer: ABBBC Right Right Right Wrong Wrong