[Urea Knowledge] Daily Question (93) 2010.04.03
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Hide the answers; no scoring will be given in principle if they are not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 13. The purpose of installing trays in a synthesis tower is ( ) A. To prevent backmixing and increase the urea conversion rate; B. To ensure the safe operation of the equipment; C. To increase production volume; D. To enhance the mechanical strength of the tower. 14. The function of the distributor in a stripping tower is ( ) A. To increase the flow rate of the liquid; B. To distribute the material evenly and improve the efficiency of stripping; C. To allow the liquid to enter the tubes as quickly as possible; D. To improve the gas-liquid contact. 15. Urea synthesis towers use trays of which type? A. Floating valve trays; B. Screen trays; C. Bubble trays; D. Jet trays. 16. Increasing the reaction time will result in what effect on production capacity? A. An increase; B. A decrease; C. No change; D. It cannot be determined. 17. Increasing the ammonia-to-carbon ratio can reduce the corrosion rate of metals by these substances, but when the ammonia-to-carbon ratio exceeds a certain value, it has little effect on the corrosion rate. A2.0 B2.8 C3.0 D3.3 The answer can be seen in the response: 13. The purpose of installing trays in a synthesis tower is (A) A. To prevent backmixing and increase the conversion rate of urea. B. To ensure the safe operation of the equipment. C. To increase production volume. D. To enhance the mechanical strength of the tower. 14. The function of the distributor in a stripping tower is (B) A. To increase the flow rate of the liquid. B. To distribute the material evenly and improve the efficiency of stripping. C. To allow the liquid to enter the tubes as quickly as possible. D. To improve the gas-liquid contact. 15. Urea synthesis towers use (B) type of trays: A. Floating valves. B. Screen trays. C. Bubble trays. D. Jet trays. 16. Increasing the reaction time will result in an increase in production capacity (B) A. Increase. B. Decrease. C. Remain unchanged. D. It cannot be determined. 17. Increasing the ammonia-to-carbon ratio can reduce the corrosion rate of metals by these substances; however, when the ammonia-to-carbon ratio exceeds (B), it has little effect on the corrosion rate. A2.0 B2.8 C3.0 D3.3
This post was last edited by wal5980729 on 2010-4-2 20:37. 13. The purpose of using trays in a synthesis tower is (A) A. To prevent backmixing and increase the conversion rate of urea. B. To ensure the safe operation of the equipment. C. To increase production volume. D. To enhance the mechanical strength of the tower. 14. The function of the distributor in a stripping tower is (B) A. To increase the flow rate of the liquid. B. To distribute the material evenly and improve the efficiency of stripping. C. To allow the liquid to enter the tubes as quickly as possible. D. To improve the gas-liquid contact. 15. Urea synthesis towers use (B) type of trays: A. Floating valves. B. Screen trays. C. Bubble trays. D. Jet trays. 16. Increasing the reaction time will result in a change in the production capacity: (B) A. An increase. B. A decrease. C. No change. D. It cannot be determined. 17. Increasing the ammonia-to-carbon ratio can reduce the corrosion rate of metals by these substances; however, when the ammonia-to-carbon ratio is above (B), it has little effect on the corrosion rate. A2.0 B2.8 C3.0 D3.3 1# Cardiac juice
13.A 14..B 15.B 16.B 17.B
13.A,14.B,15.C,16.A,17.D.
13, AC 14, BD 15, ABCD 16, A 17, D
13. The purpose of installing trays in a synthesis tower is (A). A. To prevent backmixing and increase the urea conversion rate. B. To ensure the safe operation of the equipment. C. To increase production volume. D. To enhance the mechanical strength of the tower. 14. The function of the distributor in a stripping tower is (B). A. To increase the flow rate of the liquid. B. To distribute the material evenly and improve the efficiency of stripping. C. To allow the liquid to enter the tubes as quickly as possible. D. To improve the gas-liquid contact. 15. Urea synthesis towers use (B) type of trays. A. Floating valve trays. B. Screen trays. C. Bubble trays. D. Jet trays. 16. Increasing the reaction time will result in a change in the production capacity; it will (B). A. Increase. B. Decrease. C. Remain unchanged. D. It cannot be determined. 17. Increasing the ammonia-to-carbon ratio can reduce the rate of corrosion of metals by these media, but when the ammonia-to-carbon ratio exceeds (B), its effect on the corrosion rate becomes minimal. A2.0 B2.8 C3.0 D3.3