One Question per Day on Refining Knowledge (Technology) 101110
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This post was last edited by chengkang on 2010-11-11 06:52. 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 uniform requirements, the maximum score for this activity is 5 Wealth points, and rating charm is prohibited. At the same time, friendship requests and duplicate ratings are declined. Please be cautious when posting; edits will not be effective! Those who have different opinions on the provided answers can post discussions the next day, and those who provide solutions or their own views regarding the daily question will receive appropriate rewards! The focus is on participation, and there are prizes for participating! Multiple-choice questions: 1. The two most common methods for classifying crude oil are ( ). A. Classification based on characteristic factors, classification by key fractions; B. Classification by key fractions, classification according to the relative density of crude oil; C. Classification based on sulfur content in crude oil, classification based on characteristic factors; D. Classification based on sulfur content in crude oil, classification by key fractions. 2. The forms of overflow on a tray include: uniform overflow, stepped flow, U-shaped flow, and ( ). A. Co-current B. Counter-current C. Cross-flow D. Dual overflow 3. The total temperature at the outlet of the heating furnace is ( ) the temperature of each branch. A. Below B. Above C. Equal to 4. The most commonly used type of heat exchanger in atmospheric and vacuum distillation units is ( ). A. Floating-head type B. U-tube type C. Shell-and-tube type D. Baffle dry type 5. Under uniform load conditions, the range of the gauge used for pressure measurement should be ( ) times the operating pressure. A. 1.5–2 B. 2–3 C. 1–2 D. 1.5–2.5 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: A D A A A
1:A 2:D 3:B 4:C 5:A
Why did the answer to question two turn into a smiley face? It should be D.
Answer: BCBC (1.5–3 times)
1. The two most common methods for classifying crude oil are (A) A. Classification based on characteristic factors and classification by key fractions; B. Classification by key fractions and classification according to the relative density of crude oil; C. Classification based on sulfur content in crude oil and classification based on characteristic factors; D. Classification based on sulfur content in crude oil and classification by key fractions. 2. The types of overflow on a tray include: uniform overflow, stepped flow, U-shaped flow, and (A), etc. A. Co-current B. Counter-current C. Cross-flow D. Dual overflow 3. The total temperature at the outlet of the heating furnace is (B) times the temperature of each branch. A. Below B. Above C. Equal to 4. The most commonly used type of heat exchanger in atmospheric and vacuum distillation units is (C). A. Floating-head type B. U-tube type C. Shell-and-tube type D. Baffle dry type 5. Under uniform load conditions, the range of the gauge used for pressure measurement should be equal to (A) times the operating pressure. A. 1.5–2 B. 2–3 C. 1–2 D. 1.5–2.5
B. Classification of key fractions, based on the relative density of crude oil C. Cross-flow C. Equal to C. Shell-and-tube type D. 1.5–2.5