Daily Safety Technology Quiz (Single-choice Question) (2016.8.25)
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1. Hydrocracking in chemical production is carried out under high temperature and pressure, and there are various types of hydrocracking units. The following statements regarding the hazards present in the hydrocracking process and the control methods for them are incorrect: ____. A. When hydrogen is in contact with steel under high pressure, it increases the strength of the steel. B. It is necessary to prevent leaks of oil and hydrogen in order to avoid fires and explosions. C. The heating furnace must be operated smoothly to prevent localized overheating that could lead to the destruction of the furnace tubes. D. The reactor must be fed with cold hydrogen in order to control the temperature. 2. What is the sequence for shutting down large-scale equipment in chemical plants? ____ A. Depressurize, cool down, drain completely B. Pressurize, cool down, drain completely C. Drain completely, depressurize, heat up D. Pressurize, drain, heat up A;A
1. A. -----------2、A
1. Hydrocracking in chemical production is carried out under high temperature and pressure, and there are various types of hydrocracking units. The following statements regarding the hazards present in the hydrocracking process and the control methods for them are incorrect: __A__. A. When hydrogen is in contact with steel under high pressure, it increases the strength of the steel. B. It is necessary to prevent leaks of oil and hydrogen in order to avoid fires and explosions. C. The heating furnace must be operated smoothly to prevent localized overheating that could lead to the burning through of the furnace tubes. D. The reactor must be supplied with cold hydrogen in order to control the temperature. 2. The sequence for shutting down large-scale equipment in chemical plants is __A__. A. Depressurize, cool down, drain completely B. Pressurize, cool down, drain completely C. Drain completely, depressurize, heat up D. Pressurize, drain, heat up
D. The reactor must be fed with cold hydrogen to control the temperature. A. Depressurize, cool down, and drain completely