[Daily Test Question 061] Basic knowledge of automatic control systems

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This post was last edited by LZ Gas Station on 2009-10-29 07:58. Please hide the reply. Please be careful when posting. The edit is invalid! Those who have different opinions on providing reference answers can post for discussion the next day. If multiple accounts with the same IP reply to participate, only the first one participating will be considered valid. Each participant is awarded 2 points. Each multiple-choice question in this issue is worth 3 points, and 3 points are added for all correct answers. Click here to hide the method: Hidden method multiple choice questions: 1． The interference signal appearing in DCS comes from () A. Electrostatic induction B. Electromagnetic induction C. Software failure 2. When selecting adjustment parameters, try to use () of the adjustment channel. A. The power is relatively large. B. The amplification factor is appropriately large. C. The time constant is appropriately small. D. The lag time is appropriately small. E. The deviation signal is as small as possible. 3. The following are some formulations about automatic control. The correct ones are () A. Automatic adjustment is also called automatic control. ； BThe automatic monitoring system includes automatic measurement and signal alarm, etc. It is an open-loop system. C The automatic control system includes sequence control and automatic interlocking systems, and is an open-loop system. D automatic adjustment belongs to quantitative control, it is not necessarily a closed-loop system. 4． Among the following gases, the ones that are not allowed to enter the magnetic oxygen analyzer are () A carbon monoxide B carbon dioxide C nitric oxide D nitrogen dioxide 5. Among the following liquids, the one commonly used as isolation fluid is () A glycerin B silicone oil C diesel oil D kerosene reference answer: AB BCD BCD CD AC