[Daily Test Question 057] Basic knowledge of automatic control systems

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This post was last edited by LZ Gas Station on 2009-10-21 16:23. 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． In the following cases ( ) is an oversight error. A. Error caused by miscalculation B. Error caused by recording error C. Error caused by installation error D. Error caused by misreading the scale 2. The principles that should be followed when selecting the adjusted parameters are ( ). A. Can represent process operation indicators or reflect process operation status. B. Can be measured and has sufficient sensitivity. C. Independent and controllable. D. Try to use direct indicators. E. Engineering units must be used. 3. .The following flow meters are standard throttling devices ( ). A. Orifice plate B. Nozzle C. Venturi tube D. Annubar E. Verabar 4. When measuring the temperature with a thermocouple, it is found that the thermoelectric potential is smaller than the actual value and the indication on the display instrument is low. The following possible reasons are ( ). A. Short circuit of hot electrode B. Short circuit between compensation wires C. Deterioration of thermocouple hot electrode D. Compensation wire and thermocouple do not match E. Open circuit between compensation wires 5. Commonly used anti-interference measures on site include (). A. Floating B. Shielding C. Grounding D. Filtering E. Laying cable tray reference answer: 1ABD 2ABCD 3ABC 4ABCD 5ABCD