[Soda Ash Knowledge] Question of the Day (129) February 9, 2010
Thread Content
Please hide replies; otherwise, no scoring will be given in principle. Edited posts will not be scored. Specific hiding method: http://bbs.hcbbs.com/viewthread.php?tid=492556&highlight=%D2%FE%B2%D8 This month’s questions are taken from the book “Question Bank for Technical Workers’ On-the-Job Training – Operators in Soda Ash Production”. Electronic version of the book can be downloaded here: http://bbs.hcbbs.com/thread-13140-1-2.html I. Multiple-choice questions: 1. The solubility of sodium chloride in water ( ) as the temperature rises. A. Increases B. Remains unchanged C. Slightly increases 2. The ammoniation effect on refined brine includes ( ). A. A decrease in the solubility of sodium chloride in the ammoniated solution B. An increase in the solubility of sodium chloride in the ammoniated solution C. An increase in the volume of the ammoniated brine D. Heat release during ammoniation 3. Carbon dioxide has very low solubility in brine; its mass transfer process is mainly controlled by ( ). A. Liquid film resistance B. Gas film resistance C. Solubility D. Thickness of the gas film on the gas side 4. Under what circumstances should the temperature of refined brine be kept low in order to reduce the heat load associated with ammonia absorption? ( ) A. Without affecting the process parameters B. To prevent ammonia from absorbing ammonia under negative pressure C. When ammonia does not cause crystallization in the pipes D. To prevent ammonia from absorbing ammonia at normal pressure
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. C 2. ACD 3. A 4. ABC
1. The solubility of sodium chloride in water increases slightly as the temperature rises. (C) A. Increases B. Remains unchanged C. Increases slightly
2. The ammoniation effect on refined brine includes (ACD). A. The solubility of sodium chloride in the ammoniated solution decreases. B. The solubility of sodium chloride in the ammoniated solution increases. C. The volume of the ammoniated brine increases. D. Ammoniation is an exothermic process.
3. The solubility of carbon dioxide in brine is very low; its mass transfer process is primarily controlled by (A). A. Liquid film resistance B. Gas film resistance C. Solubility D. Thickness of the gas film on the gas side
4. To reduce the heat load associated with ammonia absorption, under what circumstances should the temperature of the refined brine be kept low? (ABC) A. Without affecting process parameters B. To prevent ammonia absorption under negative pressure C. When ammonia does not cause crystallization in the pipes D. To prevent ammonia absorption at normal pressure
2. The ammoniation effect on refined brine includes (ACD). A. The solubility of sodium chloride in the ammoniated solution decreases. B. The solubility of sodium chloride in the ammoniated solution increases. C. The volume of the ammoniated brine increases. D. Ammoniation is an exothermic process.
3. The solubility of carbon dioxide in brine is very low; its mass transfer process is primarily controlled by (A). A. Liquid film resistance B. Gas film resistance C. Solubility D. Thickness of the gas film on the gas side
4. To reduce the heat load associated with ammonia absorption, under what circumstances should the temperature of the refined brine be kept low? (ABC) A. Without affecting process parameters B. To prevent ammonia absorption under negative pressure C. When ammonia does not cause crystallization in the pipes D. To prevent ammonia absorption at normal pressure
1.C; 2.ACD; 3.A; 4.ABC