Petrochemical and natural gas chemical engineering knowledge (technology) test questions April 15, 2010
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This post was last edited by yanran88 at 2010-4-14 19:06. The petrochemical and natural gas chemical knowledge (technology) test questions were edited on April 15, 2010. The maximum scoring for this event is 20 wealth. Friendship and repeated scoring are declined. Please be careful when posting. Editing is invalid (that is, no scoring will be given)! In order to prevent some members' answers from affecting other members, please hide your posts when answering questions. Thank you for your cooperation. For specific hiding methods, see: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 Thank you everyone for participating! Learn more * , communicate more, gain more! 1. The grade of a certain high-quality carbon structural steel is No. 20 steel, which means the carbon content in the steel is ( ). A 0.02% B 0.2% C 2% D 20% 2. For occasions where the temperature difference between the tube bundle and the shell is not large and the materials on the shell side are relatively clean, a ( ) heat exchanger can be selected. A Floating head type B Fixed tube plate type CU type tube type D Kettle type 3. One sample was measured three times, and the results were very close, indicating ( ). A The system error is small B The method error is small C The reagent is pure D The random error is small 4. According to the alkali washing principle of the "Long Tail Tank Da" method, 1 mol of carbon dioxide or hydrogen sulfide theoretically only requires the elimination of () sodium hydroxide. A. 1mol B. 2mol C. 3mol D. 4mol 5. The rated current of the motor fuse should be ( ) times the rated current of the motor. A 1~3 B 3~5 C 4~7 D 6~8 1, B, 2, B, 3, D, 4, A, 5, C
1.A 2.B 3.B 4.B5.A
1, B, 2, B, 3, D, 4, A, 5, C 1# yanran88
1. The grade of a certain high-quality carbon structural steel is No. 20 steel, which means the carbon content in the steel is ( ). A 0.02% B 0.2% C 2% D 20% 2. For occasions where the temperature difference between the tube bundle and the shell is not large and the materials on the shell side are relatively clean, a ( ) heat exchanger can be selected. A Floating head type B Fixed tube plate type CU type tube type D Kettle type 3. One sample was measured three times, and the results were very close, indicating ( ). A The system error is small B The method error is small C The reagent is pure D The random error is small 4. According to the alkali washing principle of the "Long Tail Tank Da" method, 1 mol of carbon dioxide or hydrogen sulfide theoretically only requires the elimination of () sodium hydroxide. A. 1mol B. 2mol C. 3mol D. 4mol 5. The rated current of the motor fuse should be ( ) times the rated current of the motor. A 1~3 B 3~5 C 4~7 D 6~8