【Daily Quiz 055】Basic Knowledge of Control Systems

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This post was last edited by LZ Gas Station on 2009-10-19 at 16:48. Please hide your replies; all participants will receive 2 points as a reward, 1 point for each question answered correctly, plus an additional 3 points for answering all questions correctly. Also, be careful when posting – edits are invalid! Those with different views on the provided answer keys can post discussions the next day. For multiple accounts under the same IP address, only the first response counting as participation is valid. For methods to hide this, click here: Multiple-choice question on hiding methods: 1. The distance between the pipeline and the cable should not be less than ( ) mm. A、150 B、100 C、80 D、50 2. Pressure gauges for oxygen must be prohibited from (). A. Ammonia B. Oil C. Water 3. In a certain throttling unit, the measurement range is 0–5 t/h, and a Type III electric differential pressure transmitter is used. When the DCS control station shows a flow rate of 3.5 t/h, what is the output current of the differential pressure transmitter in ( ) mA? A、9.8 B、11.84 C、14 D、15.2 4. During actual operation, the valve position of a control valve should be at （） for optimal performance. A. 15%~90% B. 30%~80% C. 20%~100% D. Full stroke 5. The pressure of the heating steam generally does not exceed ( ) MPA. A. 0.5 MPA B. 1.0 MPA C. 1.5 MPA D. 2.0 MPA True or False: 6. The only advantage of proportional control is its ability to eliminate residual error. 7. When selecting a control valve, the nominal pressure can be determined as long as the operating pressure is known. 8. When using a thermocouple for temperature measurement, if compensation wires are used for the connection wires, it is not necessary to consider the compensation for the cold end of the thermocouple. 9. The measurement error that occurs when it is inconvenient to measure the quantity being measured is called a static error. 10. Under certain conditions, the sensitivity of the instrument increases, while its accuracy decreases. Answer: ABBBBB Wrong Wrong Wrong Right Right