“\"Chlor-alkali exam questions\" [024] event post – please hide your replies
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This post was last edited by sunjl1981 on 2013-1-6 at 20:21. To encourage active participation from members, 3 wealth points are given for each correct answer; if a calculation process is provided, or if a valid reason is given, an additional reward of 3 to 6 wealth points is awarded. I believe it’s not about the quantity, but having a reward is enough. The key is everyone’s active participation (participation brings talent) and progressing together. (Note: This post can only have scores from moderators; other scores are invalid.) Question: 1. (Fill-in-the-blank) In the combustion of hydrogen, the main reason for the flame to appear white is ________. 2. (Single-choice question) The hydrogen content in liquid chlorine off-gases must be strictly controlled to not exceed ( )%. A、0.4% B、3% C、4% D、1% 3. (Single-choice question) When performing maintenance work that involves open flames, the oxygen content in the inert gas used for displacement should generally be less than_______(volume percentage). A、2% ~ 3% B、1% ~ 3% C、1% ~ 2% D、0.5% ~ 1% Please hide your replies; no scoring will be given unless they are hidden. For instructions on how to hide them, click here: Hiding method. Answers using the same IP are valid only for the first post. Also, be careful when posting – edits are invalid! Thank you all! Reference answer: # hcbbs
1. Excess hydrogen 2. C 3. C 1# box22323
1 Excess hydrogen 2 C 3 Dbbs.com/redirect.php?goto=findpost&pid=3357461&ptid=592867]1# box22323
1. Excess moisture content in hydrogen gas； 2. C ； 3. C
1 contains a small amount of chlorine 2D 3D
Question 1: Excess hydrogen. (Note: If an excessive amount is used, a large amount of white mist will be generated in the furnace, and it may even cover the sight glass, causing it to lose its transparency.) An excess of chlorine will turn the flame yellow to red. ) Question 2: C. A safety threshold of 4%; the values are more or less the same for all companies. Question 3: C. Relevant regulations also stipulate that the concentration of flammable and explosive gases in the replaced containers and pipelines must be below 10% of their lower explosive limit before work can proceed.
1. When hydrogen burns, the heat generated can reach 142,120 KJ/kg, which is about 3 times that of gasoline. The temperature of a hydrogen-oxygen flame can reach 2500–3000°C, which is why it appears white. 2.A 3.C
1 Chlorine contains oxygen, 2A, 3C
1. Chlorine is present in hydrogen gas 2A 3D
1. Excess moisture 2. C 3. C