One Question per Day on Synthetic Ammonia (Series 3)

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This post was last edited by 654262293 on 2016-2-10 at 18:28. 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 II: 11. Regarding the regulation of centrifugal compressors, a special requirement is to prevent ( ). (A) Surge (B) Cavitation (C) Vibration (D) Cylinder collision. 12. The method of adjusting the bypass flow rate can be used to control the main flow rate at the compressor outlet; the disadvantage is ( ). (A) Difficult to adjust (B) High energy consumption (C) Complex adjustment procedure (D) High cost. 13. When the heat transfer rate of the condenser is low and the outlet temperature is low, the adjustment method involves controlling the condensate ( ). (A) Temperature (B) Pressure (C) Unexpelled volume (D) Flow rate. 14. In operation, an ammonia cooler maintains a ( ) evaporation space; once the space is filled with liquid ammonia, no further vaporization can occur. (A) 40%–50% (B) 100% (C) 20%–30% (D) 10%–20% 15. When there is a margin in the heat transfer area of the ammonia cooler, the outlet ( ) control method can be used to regulate the flow rate of liquid ammonia, and this is based on… (A) Temperature (B) Pressure (C) Flow rate (D) Waste discharge volume. Answers: A, B, C, A, A respectively. The above questions are taken from “Advanced Questions for Ammonia Synthesis Operators”; the scoring starts at 3 points, with 1 point added for each correct answer. It should be specifically noted that respondents are required to hide their answers. If the answerer’s score is not hidden, it is halved. For methods to hide posts, see: http://bbs.hcbbs.com/thread-1551107-1-1.html