Refining Knowledge (Technology) Daily Question 101128
Thread Content
We welcome everyone 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 rating charm is prohibited. At the same time, friendship requests and repeated ratings are declined. , N6 t. z4 a! j+ u Please be cautious when posting; edits are invalid. Reference answers are provided for reference. Those with different opinions can post discussions the next day. Appropriate rewards will be given to those who provide solutions or their own opinions regarding the daily question’s reference answer! The focus is on participation, and there are prizes for it! Friends who do not want their replies hidden can refer to: http://bbs.hcbbs.com/thread-492556-1-1.html. 9. During the heating process of the equipment itself and its attachments, uneven expansion occurs; therefore, at certain temperature levels, it is necessary to carry out ( ). 5 k9 g" ?" w7 y7 F# q A. Thermal tightening B. Pressure testing C. Airtightness testing D. Purging. 2. The purpose of heating the equipment is to eliminate any relaxation in the flanges, so that there is sufficient pressure on the sealing surfaces to ensure effective static sealing. A Increase B Eliminate C Change D Ensure. 7 `8 J: m) L! U8 t0 k+ Z 3 The heat exchanger must undergo ( ) before it can be put into use; it can only be utilized after passing this inspection. 7 F: I$ A purging B heat sealing C pressure testing D flushing. 4 For a distillation tower, the reflux ratio is determined by ( ). A Thermal equilibrium B Fractionation accuracy C Energy consumption D Cannot be determined. 2 f% Q+ O g" I: K' t9 Y- An increase in the top reflux of the fractionating column leads to a decrease in the top temperature; what happens to the internal reflux? 3 z0 M( P; U! t# B A B increases accordingly, B decreases accordingly, C remains unchanged, D cannot be determined- ?: @) U7 {$ P! S' Q) o Answer: ABCAA
Reply 1# dongliangsir 1.A 2.B 3.C 4.C 5.A
1 During the heating process, due to uneven expansion at the connection points between the main body of the heat exchange equipment and its accessories, it is necessary to carry out (A thermal tightening) at certain temperature levels. The purpose of heating the equipment is (B to eliminate) any loosening of the flanges, so that there is sufficient pressure on the sealing surfaces to ensure effective static sealing. The L! U8 t0 k+ Z 3 heat exchanger must undergo (C) pressure testing before it can be put into use; it can only be utilized after passing this test. 7 F: For a distillation column, the reflux ratio is determined by (B separation accuracy). O g" I: K' t9 Y- # P5 _ E/ r$ k3 f% l1 a3 s As the top reflux in the 5-stage fractionation column increases, the top temperature decreases, while the internal reflux (Phase B) correspondingly decreases. 3 z0 M( P; U! t# B; |6 d6 M, k) ~2 f* C#
1 During the heating process, due to uneven expansion at the connection points between the main body of the heat exchanger equipment and its accessories, it is necessary to carry out (A) at certain temperature levels. 2 The purpose of heating the equipment is (A) to relieve the tension in the flanges, so that there is sufficient pressure on the sealing surfaces to ensure an effective static seal. 3 The heat exchanger must undergo (B) before being put into use, and can only be used after passing the inspection. 4 For a distillation column, the reflux ratio is determined by (A). 5. The top reflux of the fractionation tower increases, the top temperature decreases, while the internal reflux (A). A increases accordingly B decreases accordingly C remains unchanged D cannot be determined-
1. A 2. B 3. C 4. B 5. B
This post was last edited by dongliangsir on 2010-11-28 14:56: a b c a a
The last edit to this post was made by dongliangsir on 2010-11-28 at 14:57. The purpose of heating the equipment is to reduce the relaxation of the flanges, so that there is sufficient pressure on the sealing surface to ensure an effective static seal. A increase