One Question per Day on Refining Knowledge (Technology) 101108

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This post was last edited by chengkang on 2010-11-9 06:19. Everyone is welcome to actively participate in the learning and discussion of professional basic knowledge in the refinery processing technology exchange area! In accordance with the forum’s uniform requirements, the maximum score for this activity is 5 Wealth points, and it is prohibited to assign charm scores. Friendship requests and duplicate ratings are also declined. Please be cautious when posting; edits will not be valid! 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 question 1: Foam entrainment is caused by ( ). A. The vapor phase matching is too low. B. The liquid phase matching is too low. C. The vapor phase matching is too high. D. The liquid phase matching is too high. 2. The water level in the atmospheric leg of the reduced-vacuum pumping system should be around ( ). A. 760 centimeters B. 10.33 meters C. 101325 millimeters D. 760 millimeters 3. The required pressure for circulating water is ( ). A. Not less than 0.35 MPa B. Not less than 0.1 MPa C. Not less than 0.6 MPa D. Not less than 0.9–1.0 MPa 4. The normal roof reflux is ( ). A. Cold reflux B. Hot reflux C. Mid-stage circulating reflux D. Internal reflux 5. The liquid that flows out layer by layer from the top of the distillation column is called ( ). A. Hot reflux B. Circulating reflux C. Cold reflux D. Internal reflux. The daily question format has been introduced; I hope all moderators will take on the task of creating questions! Contact me via the in-app message one day in advance. Reference answer: C B A A D