One Question per Day on Refining Knowledge (Technology) 101107

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This post was last edited by chengkang on 2010-11-8 06:31. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refining technology exchange area! In accordance with the forum’s unified requirements, the maximum score for this activity is 5 Wealth points, and it is prohibited to assign charm scores. Friendships and duplicate ratings are also declined. Please be cautious when posting; edits will not be effective! Those who have different opinions on the provided answer keys can post discussions the next day, and those who provide solutions or their own opinions regarding the daily question’s answer key will receive appropriate rewards! The focus is on participation, and there are prizes for participating! Multiple-choice questions: 1. In a atmospheric and vacuum distillation unit, the temperature measuring instrument that enables remote transmission, automatic recording, and centralized control is ( ). A. Glass liquid thermometer B. Thermocouple C. Bimetallic thermometer D. Thermometer sleeve 2. The phenomenon of cavitation is likely to occur in ( ). A. Reciprocating pump B. Centrifugal pump C. Positive displacement pump D. Plunger pump 3. As the amount of naphthenes in the distillate increases, the viscosity of the distillate oil ( ). A. Unchanged B. Decreased C. Increased D. Irregular 4. Oil generally does not contain ( ) A. Olefins B. Alkanes C. Aromatic hydrocarbons D. Naphthenes 5. The relationship between the autoignition temperature and the flash point of oils is ( ) A. A higher autoignition temperature corresponds to a higher flash point B. A lower autoignition temperature corresponds to a lower flash point C. A lower autoignition temperature corresponds to a higher flash point D. There is no corresponding relationship. The daily question format has been introduced; I hope all moderators will take on the task of creating questions! Answer key: B B C A C