Synthetic Ammonia: Question of the Day – Multiple Choice Question 339 (Sunday, January 1, 2012)

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Multiple-choice question: 1. Originally, the centrifugal pump conveyed water at a flow rate of m. Now it is used to convey an aqueous solution whose density is 1.1 times that of water; all other physical properties can be considered the same as those of water. Given that the pipeline conditions remain unchanged, the flow rate ( ). A. Increase ； B. Decrease ； C. Unchanged ； D. Cannot be determined. 2. When shutting down a centrifugal pump, it is advisable to ( ). A. Power off first, then close the valve ； B. Turn off the outlet valve first, then cut off the power ； C. It’s acceptable to close the outlet valve first or cut off the power first ； D. For single-stage pumps, cut off the power first; for multi-stage pumps, close the outlet valve first. The purpose of the “One Question per Day on Basic Knowledge of Ammonia Synthesis Production” activity is to review the knowledge we have already learned. By answering questions, participants can improve and strengthen their fundamental theoretical knowledge, reinforce what they already know, recall what they have forgotten, and discuss controversial points in order to make progress together. There will be rewards for the top 50 answerers. Those who briefly explain their reasons for choosing will be given extra points at discretion! Please reply to the answer in a hidden manner; otherwise, it will be invalid. Hidden reference method: http://bbs.hcbbs.com/thread-492556-1-1.html-. Please do not edit after replying. Answers: 1C; 2B