【Daily Quiz 098】Basic Knowledge of Control Systems
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This post was last edited by LZ Gas Station on 2009-12-21 08:27. Multiple-choice question: 1. A megohmmeter has three terminals, labeled L, E, and G, which respectively represent (). A. Wire, electricity, screen B. Screen, wire, ground C. Ground, wire, screen D. Wire, screen, ground 2. When laying compensation wires, the maximum allowable temperature around the wires is ( ) degrees Celsius for rubber-insulated wires, and 125 degrees Celsius for asbestos-insulated wires. A.50 B.100 C.70 D.80 3. Except when installed on the process pipe rack, the location of instrument circuits should be on the side with a lower risk of explosion and fire (). When the density of the explosive or flammable substances in the process pipes is greater than that of air, they should be located on the () side of the process pipes. A. Lower, bottom B. Lower, top C. Higher, bottom D. Higher, top 4. The interlock protection system is tested and inspected based on (), to ensure that it is sensitive, accurate, and reliable. A. Logic diagram B. Installation diagram C. Wiring diagram 5. The control valve with the lowest noise level is ( ). A. Straight-through single-seat valve B. Straight-through double-seat valve C. Sleeve valve D. Eccentric rotary valve True or False: 6. In engineering calculations, all physical quantities must be expressed in units of the International System of Units. 7. When laying the pipeline for instrument air supply, connections between branch pipes and main pipes, as well as between branch pipes themselves, can be made using threaded connections or welding. 8. The common parameter tuning methods for automatic control systems include the empirical method, the attenuation curve method, the critical proportionality method, and the response curve method. 9. The solenoid valves used in accident-safe interlock systems operate when powered on. 10. The precision of measurement is a prerequisite for achieving good accuracy. Reference answer: DCBAC Wrong Wrong Right Right Right
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DDBAC wrong wrong right right right
Multiple-choice question: 1. A megohmmeter has three terminals, marked L, E, and G, which respectively represent (D). A. Wire, electricity, screen B. Screen, wire, ground C. Ground, wire, screen D. Wire, screen, ground 2. When laying compensation wires, the maximum allowable temperature around the wires is (B) degrees Celsius for rubber-insulated wires, and 125 degrees Celsius for asbestos-insulated wires. A.50 B.100 C.70 D.80 3. Apart from being installed along the process pipe racks, the instrumentation circuits should be located on the side with a lower level of explosion and fire risk. When the media contained within the process pipes pose an explosion or fire hazard and have a density greater than that of air, they should be placed on the (B) side of the process pipes. A. Lower, bottom B. Lower, top C. Higher, bottom D. Higher, top 4. The interlock protection system is tested and inspected based on (A) to ensure that it is sensitive, accurate, and reliable. A. Logic diagram B. Installation diagram C. Wiring diagram 5. The control valve (C) that produces the least noise is: A. Straight-through single-seat valve B. Straight-through double-seat valve C. Sleeve valve D. Eccentric rotary valve True or False: 6. In engineering calculations, all physical quantities must be expressed in units of the International System of Units. F 7. When laying the instrument air supply pipelines, connections between branch pipes and main pipes, as well as between branch pipes themselves, can be made using threads or welding. T 8. The common parameter tuning methods for automatic control systems include the empirical method, the attenuation curve method, the critical proportionality method, and the response curve method. T 9. The solenoid valves used in accident-safe interlock systems operate when powered on. T 10. The precision of measurement is a prerequisite for achieving good accuracy. T
D C B A C Wrong Wrong Wrong Wrong Right
1.D;2.C;3.A;4.A;5.C;6.Right； 7. Wrong ； 8. Yes ； 9. Yes ； 10. For 1# LZ Gas Station
CDAAC right wrong right wrong right