[Urea Knowledge] Daily Question (87) 2010.03.28
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This post was last edited by shiguomiao on 2010-3-28 07:23. Hide the answer; no scoring will be given in principle if it is not hidden. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 All questions are taken from the book “Fertilizer Production Operators”; the download link for this book is http://bbs.hcbbs.com/thread-13140-1-2.html. Note: The following five questions are all multiple-choice questions. 15. How much air is required per ton of urea in a naturally ventilated granulation tower? A 1000–2000 m3 (standard) B 5000 m3 (standard) C 8000–10000 m3 (standard) 16. As the temperature increases, what happens to the density and viscosity of a saturated urea solution? A Decrease, Increase B Increase, Decrease C Increase, Increase D Decrease, Decrease 17. What is the material used for the rotating ring of a mechanical seal? A Graphite B Tungsten carbide C 316L D Silicon carbide 18. Which of the following chemical fertilizers has the highest nitrogen content? A NH3.H2O B NH4Cl C NH4NO3 D (NH2)CO2 E (NH4)2SO4 19. If the atmospheric pressure is 100 KPa and the pressure during the second stage of evaporation is 3.5 KPa (absolute), then what are the vacuum level and degree of vacuum? A 3.5 KPa, 96.5% B 96.5 KPa, 96.5% C 3.5 KPa, 3.5% D 96.5 KPa, 3.5% 15. How much air is required per ton of urea in a naturally ventilated granulation tower? (C) A 1000–2000 m3 (standard) B 5000 m3 (standard) C 8000–10000 m3 (standard) 16. As the temperature increases, what happens to the density and viscosity of a saturated urea solution? (B) A Decrease, Increase B Increase, Decrease C Increase, Increase D Decrease, Decrease 17. What is the material used for the rotating ring of a mechanical seal? (A) A Graphite B Tungsten carbide C 316L D Silicon carbide 18. Which of the following chemical fertilizers has the highest nitrogen content? (D) A NH3.H2O B NH4Cl C NH4NO3 D (NH2)CO2 E (NH4)2SO4 19. If the atmospheric pressure is 100 KPa and the pressure during the second stage of evaporation is 3.5 KPa (absolute), then what are the vacuum level and degree of vacuum? (B) A 3.5 KPa, 96.5% B 96.5 KPa, 96.5% C 3.5 KPa, 3.5% D 96.5 KPa, 3.5%
This post was last edited by shiguomiao on 2010-3-28 at 11:08. 15. For natural ventilation granulation towers, the amount of air required per ton of urea is (C). A 1000–2000 m3 (standard conditions); B 5000 m3 (standard conditions); C 8000–10000 m3 (standard conditions). 16. The density and viscosity of a saturated aqueous solution of urea increase as the temperature rises (B). A Decrease; Increase; B Increase; Decrease; C Increase; Increase; D Decrease; Decrease. 17. The material used for the rotating ring in mechanical seals is (A). A Graphite; B Tungsten carbide; C 316L; D Silicon carbide. 18. Which of the following chemical fertilizers has the highest nitrogen content? (D) A NH3.H2O; B NH4Cl; C NH4NO3; D (NH2)2CO2; E (NH4)2SO4. 19. If the atmospheric pressure is 100 KPa and the pressure during the second stage of evaporation is 3.5 KPa (absolute), then the vacuum level and degree of vacuum are (B). A 3.5 KPa; 96.5%; B 96.5 KPa; 96.5%; C 3.5 KPa; 3.5%; D 96.5 KPa; 3.5%
The molecular formula of CBADB urea is CO(NH2)2
15. For natural ventilation granulation towers, the amount of air required per ton of urea is (A). 16. The density and viscosity of a saturated urea solution increase as the temperature rises (A). 17. The material used for the rotating ring in mechanical seals is (D). 18. Which of the following chemical fertilizers has the highest nitrogen content? (A) 19. If the atmospheric pressure is 100 KPa and the pressure during the second stage of evaporation is 3.5 KPa (absolute), then the vacuum level is (C)
15. For natural ventilation granulation towers, the amount of air required per ton of urea is (A) A 1000–2000 m3 (standard conditions) B 5000 m3 (standard conditions) C 8000–10000 m3 (standard conditions) 16. The density and viscosity of a saturated aqueous solution of urea increase as the temperature rises (B) A Decrease Increase B Increase Decrease C Increase Increase D Decrease Decrease 17. The material used for the rotating ring in mechanical seals is (A) A Graphite B Tungsten carbide C 316L D Silicon carbide 18. Which of the following chemical fertilizers has the highest nitrogen content? (A) A NH3.H2O B NH4Cl C NH4NO3 D (NH2)CO2 E (NH4)2SO4 19. If the atmospheric pressure is 100 KPa and the pressure during the second stage of evaporation is 3.5 KPa (absolute), then the vacuum level and percentage of vacuum are (D) A 3.5 KPa, 96.5% B 96.5 KPa, 96.5% C 3.5 KPa, 3.5% D 96.5 KPa, 3.5%
This post was last edited by Luo Hu 15185080221 on 2010-3-28 11:18: 15A16D17D18C19A