[Daily Test Question 032] Basic knowledge of automatic control systems (please hide answers)

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This post was last edited by LZ Gas Station on 2009-8-25 16:47. Currently, all members have the permission to use hidden replies. Please cooperate actively. In principle, no rating will be given if the reply is not hidden. The full score is 10 points, and appropriate points will be added to the first five correct answers. In addition, please be careful when posting, editing is invalid! Those who have different opinions on providing reference answers can post for discussion the next day. Click here to hide the method: Hiding method: If multiple accounts with the same IP address reply and participate, only the valid reply of the first participating participant will be counted. Just give the answer code directly. Multiple choice questions: 1． DCS technology is becoming mature, and the emerging ( ) technology is the future development direction of the automation field A. Field bus control B. Intelligent digital transmitter C. Intelligent positioner D. Not qualitative 2. Insufficient insulation resistance of a thermocouple wire to ground will cause DCS indication ( ) A. Unchanged B. Fluctuation C. Too high D. Too low 3. To clean instrument parts, generally use ( ) A. Benzene B. Gasoline C. Alcohol D. Carbon tetrachloride 4. Among the signal marks of the regulating valve, the correct statement about F.O is ( ) A. It means the air valve opens B. It means the valve opens in an accident state C. It means the butterfly valve D. None of them are correct 5. In the new explosion-proof standards, the letter code for the intrinsically safe type of explosion-proof structure is ( ) A. e B. h C. n D. i True or False Question: 6. If the power supply polarity of the pressure transmitter is reversed, the instrument will burn out ( ) 7. Absolute zero is -273.15°C. ( ) 8. When using an electromagnetic flowmeter to measure liquid flow, the pipeline of the measured medium must be full. ( ) 9. The compressor inlet regulating valve generally uses an air shut-off valve. ( ) 10. .In the flow control loop, opening the process secondary line valve will worsen the flow characteristics of the regulating valve. ( ) Reference answer: ADCBD False True True True True