One Question per Day on Synthetic Ammonia (Series 57)
Thread Content
I. Multiple-choice questions (Each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets) Continuing from Series 56: 126, the sulfur release phenomenon during the reduction process of medium-temperature shift catalysts refers to (). A. Cobalt oxide is reduced to cobalt sulfide. B. Molybdenum oxide is reduced to molybdenum sulfide. C. Sulfate ions are reduced to hydrogen sulfide. D. Organic sulfur is reduced to inorganic sulfur. 127. The batch gas production method widely used in small and medium-sized ammonia plants in China is carried out in （）gas generators. A. Fixed-bed moving bed B. Fixed-bed pressurized gasification C. Fluidized bed D. Pneumatic bed. 128. Working at a height of ( ) meters is considered second-level high-altitude work. A. 1–2 B. 2–15 C. 15–30 D. 30–60129. The maximum allowable concentration of hydrogen sulfide specified in China’s enterprise health standards is ( ) mg/m3 of air. A、10 B、20 C、30 D、40. 130. What material should be given priority when selecting chemical storage containers? A. Carbon steel B. Low-alloy steel C. Stainless steel D. Titanium steel Answer: CABAB Scoring criteria: 3 points for participation, 1 point for each correct answer
CABAB~~~~~~~~~
Question 128 of DBBAA should be 5-15m
126. The sulfur release phenomenon during the reduction of medium-temperature shift catalysts refers to (C). A. Cobalt oxide is reduced to cobalt sulfide. B. Molybdenum oxide is reduced to molybdenum sulfide. C. Sulfate ions are reduced to hydrogen sulfide. D. Organic sulfur is reduced to inorganic sulfur. 127. The batch gas production method widely used in small and medium-sized ammonia plants in China is carried out in (A) gas generators. A. Fixed-bed moving bed B. Fixed-bed pressurized gasification C. Fluidized bed D. Pneumatic bed 128. Working at a height of ( ) meters is considered secondary high-altitude work. A. 1–2 B. 2–15 C. 15–30 D. 30–60. There seems to be an issue with the answer to this question; generally, work at heights of more than 2 meters is considered high-altitude work. When the height of such work is between 2 and 5 meters, it is classified as level 1 high-altitude work ； When the working height at heights above 5 meters but up to 15 meters is considered, it is referred to as level 2 high-altitude work. Therefore, the answer to this question is incorrect. 129. The maximum allowable concentration of hydrogen sulfide specified in China’s enterprise health standards is (A) mg/m3 of air. A、10 B、20 C、30 D、40 130、The material that should be given priority for use in chemical processing containers is (B). A. Carbon steel B. Low-alloy steel C. Stainless steel D. Titanium steel