[Urea Knowledge] Daily Question (89) 2010.03.30
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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 All questions are drawn from “Fertilizer Production Operator”; the download link for this book is http://bbs.hcbbs.com/thread-13140-1-2.html. 26. The main cause of ammonia nitrogen loss in the urea production plant is ( ). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures. 27. To remove scale from the working surfaces of equipment, common methods include ( ). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing. 28. Possible reasons for a gradual decrease in vacuum in the two-stage separator include ( ). A. Crystallization B. Blockage of pressure measurement tubes C. Accumulation of biuret. 29. As the rotation speed of the nozzles increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will ( ). A. Increase B. Decrease C. Remain unchanged. 30. The reaction between formaldehyde and ammonia water is ( ). A. Exothermic B. Endothermic C. No reaction heat. 26. The main cause of ammonia nitrogen loss in the urea production plant is (A). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures. 27. To remove scale from the working surfaces of equipment, common methods include (ABC). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing. 28. Possible reasons for a gradual decrease in vacuum in the two-stage separator include (C). A. Crystallization B. Blockage of pressure measurement tubes C. Accumulation of biuret. 29. As the rotation speed of the nozzles increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (B). A. Increase B. Decrease C. Remain unchanged. 30. The reaction between formaldehyde and ammonia water is (A). A. Exothermic B. Endothermic C. No reaction heat
26.A.B.C,27.A.B.C,28.B,29.B,30.A
26. The main cause of ammonia nitrogen loss in the urea production plant is (A). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures 27. Common methods for removing scale from the working surfaces of equipment include (ABC). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing 28. Possible reasons for the gradual decrease in vacuum in the two-stage separator are (C). A. Crystallization B. Blockage of pressure tapping pipes C. Accumulation of biuret 29. As the speed of the nozzle increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (B). A. Increase B. Decrease C. Remain unchanged 30. The reaction between formaldehyde and ammonia water is (B). A. Exothermic B. Endothermic C. No heat release
26/ABC 27ABC 28/AB 29/A 30/A
26、B； 27, B ； 28, C ； 29, B ； 30, B.
1.B2.B3.A4.A5.B
26. The main reason for ammonia nitrogen loss in the urea production plant is (A). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures 27. Common methods for removing scale from the working surfaces of equipment include (ABC). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing 28. Possible reasons for the gradual decrease in vacuum in the two-stage separator are (C). A. Crystallization B. Blockage of pressure measurement tubes C. Accumulation of biuret 29. As the speed of the nozzle increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (B). A. Increase B. Decrease C. Remain unchanged 30. The reaction between formaldehyde and ammonia water is (B). A. Exothermic B. Endothermic C. No reaction heat released
26. The main cause of ammonia nitrogen loss in the urea production plant is (A). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures 27. Common methods for removing scale from the working surfaces of equipment include (ABC). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing 28. Possible reasons for a gradual decrease in vacuum in the two-stage separator include (C). A. Crystallization B. Blockage of the pressure transfer pipes C. Accumulation of biuret 29. As the speed of the nozzle increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (B). A. Increase B. Decrease C. Remain unchanged 30. The reaction between formaldehyde and ammonia water is (A). A. Exothermic B. Endothermic C. No reaction heat is produced 1# shiguomiao
26.A 27.ABC 28.C 29.B 30.A
26. The main reasons for ammonia nitrogen loss in the urea production plant are (a) A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures. 27. Common methods for removing scale from the working surfaces of equipment include (abc) A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing. 28. Possible reasons for a gradual decrease in vacuum in the two-stage separator include (c) A. Crystallization B. Blockage of pressure measurement tubes C. Accumulation of biuret. 29. As the speed of the nozzle increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (b) A. Increase B. Decrease C. Remain unchanged. 30. The reaction between formaldehyde and ammonia water is (b) A. Exothermic B. Endothermic C. No reaction heat
26. The main cause of ammonia nitrogen loss in the urea production plant is (A). A. Startup and shutdown processes B. Discharge of wastewater and exhaust gases C. Valve leaks D. Mechanical failures 27. Common methods for removing scale from the working surfaces of equipment include (ABC). A. Mechanical cleaning B. Chemical cleaning C. High-pressure water flushing 28. Possible reasons for the gradual decrease in vacuum in the two-stage separator are (C). A. Crystallization B. Blockage of the pressure transfer pipes C. Accumulation of biuret 29. As the speed of the nozzle increases, the temperature of the urea exiting the tower (with all other conditions unchanged) will (B). A. Increase B. Decrease C. Remain unchanged 30. The reaction between formaldehyde and ammonia water is (A). A. Exothermic B. Endothermic C. No reaction heat