【Learn Ethylene Together】Five questions per day to easily learn about ethylene in 30 days
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【Learn Ethylene Together】Five questions per day to easily learn about ethylene – over 30 multiple-choice questions. Question 16: What is the function of the minimum return line in a compressor’s \"five-return-five\" or \"four-return-four\" system? （） a. Anti-surge b. Leak prevention c. Prevention of minimum air velocity d. Ensuring minimum flow rate. 17. Which of the three types of units have their lubricating oil returning directly to the oil tank by the user? ( ) a. Lubricating oil b. Control oil c. Sealing oil 18. Possible causes of pressure fluctuations in the demethanization tower. ( ) a. Fluctuations in the hydrogen volume b. Poor heat transfer in the condenser at the top of the demethanization tower c. Too rapid adjustment of the medium-boiling point reactor d. Fluctuations in the ethylene compressor. 19. Possible reasons for overheating in the acetylene hydrogenation reactor. ( ) a. Excessively high content of butadiene in the feed; b. Excessive hydrogen-to-hydrocarbon ratio; c. High CO content with untimely adjustment; d. Hydrogen leakage into the bed during standby. 20. Possible reasons for polymerization in the bottom of the debutanizing tower. （） a. High temperature at the bottom of the tower b. Low temperature at the bottom of the tower c. High liquid level d. Low liquid level. 16. The function of the minimum return line in a compressor’s ‘five returns five’ or ‘four returns four’ system. (a, b, c, d) a. Anti-surge protection b. Leak prevention c. Protection against minimum airflow velocity d. Ensuring a minimum flow rate. 17. Which of the three types of units have their lubricating oil returning directly to the oil tank by the user? (a, b) a. Lubricating oil b. Control oil c. Sealing oil 18. Possible causes of pressure fluctuations in the demethanizer. (a, b, c) a. Fluctuations in the hydrogen volume; b. Poor heat transfer in the condenser at the top of the demethanizer; c. Too rapid adjustment of the medium-boiling point heater; d. Fluctuations in the ethylene compressor. 19. Possible reasons for excessive temperature rise in the acetylene hydrogenation reactor. (a, b, c, d) a. Excessively high butadiene content in the feed; b. Excessive hydrogen-to-hydrocarbon ratio; c. High CO content with untimely adjustment; d. Hydrogen leakage into the bed during standby mode. 20. Possible reasons for polymerization in the bottom of the debutane tower. (a, b, c, d) a. High bottom of tower temperature b. Low bottom of tower temperature c. High liquid level d. Low liquid level
The answers are respectively: DADDA
I feel the same way; especially for question 18, it seems like several answers were correct: lol
16. The function of the minimum return line for the compressor’s “five returns five” or “four returns four” mode. (acd) a. Anti-surge b. Leak prevention c. Prevention of minimum air velocity d. Ensuring minimum flow rate. 17. Which of the three types of units have their lubricating oil returning directly to the oil tank by the user? (ab) a. Lubricating oil b. Control oil c. Sealing oil 18. Possible causes of pressure fluctuations in the demethanizer. (ac) a. Fluctuations in the hydrogen volume; b. Poor heat transfer in the condenser at the top of the demethanization tower; c. Too rapid adjustment of the medium-boiling point reactor; d. Fluctuations in the ethylene compressor. 19. Possible reasons for excessive temperature rise in the acetylene hydrogenation reactor. (acb) a、Excessively high content of butadiene in the feed; b、Too high hydrogen-to-hydrocarbon ratio; c、High CO content with inadequate adjustment; d、Hydrogen leakage into the bed during standby mode. 20、Possible reasons for polymerization in the bottom of the debutanizing tower. (bc) a. High reboiler temperature b. Low reboiler temperature c. High liquid level d. Low liquid level