One Question per Day on Synthetic Ammonia (Series 66)
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I. Multiple-choice questions (Each question has 4 options, of which only 1 is correct; fill in the correct option in the brackets) Continuation of Series 65171. The temperature range for deep refrigeration is ( ). A. Above 173K B. Below 273K C. Below 173K D. Below 73K 172. The properties that a refrigerant should possess are ( ) A. High boiling point B. Low boiling point C. Small latent heat of vaporization D. Evaporation pressure lower than atmospheric pressure 173. In chemical production, as long as the operator performs their tasks carefully, the quality of a batch of products can ( ) A. Be completely consistent B. Not be completely consistent C. Sometimes be completely consistent D. Should be completely consistent 174. When producing semi-water gas using the batch method, the function of the ( ) stage is to prevent the vaporization layer from rising. A. Blowing air B. Single upward blowing C. Double upward blowing D. Downward blowing 175. What can cause permanent poisoning of the ammonia synthesis catalyst? A、H2O B、H2S C、CO D、CO2 Answer: CBBDB Scoring criteria: 3 points for participation, 1 point for each correct answer
CBBDB~~~~~~~~~~~~
171. The temperature range for deep cryogenics is (C). A. Above 173K B. Below 273K C. Below 173K D. Below 73K 172. The property that a refrigerant should possess is (B) A. High boiling point B. Low boiling point C. Small latent heat of vaporization D. Evaporation pressure lower than atmospheric pressure 173. In chemical production, as long as the operator performs their tasks carefully, the quality of a batch of products can be (B) A. Made completely consistent B. Not made completely consistent C. Sometimes made completely consistent D. Should be made completely consistent 174. When producing semi-water gas using the batch method, the function of the (D) stage is to prevent the vaporization layer from rising. A. Blowing air B. Single upward blowing C. Double upward blowing D. Downward blowing 175. The substance that can cause permanent poisoning of the ammonia synthesis catalyst is (B). A、H2O B、H2S C、CO D、CO2