【Daily Question: Pump Equipment】Multiple-choice - True/False Question, April 28, 2019

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The last edit to this post was made by 3983596_FPPZ on 2019-4-28 at 10:27; the file bk12.jpg is attached. Rules for answering questions and managing the system: 1. If all answers to a question are incorrect, participants will still receive a reward of 2 wealth points； 2. A reward of 5 wealth points is given for partially correct answers ； A reward of 8 wealth for all correct answers ； 3. Rewards for answers are available once per person only ； 4. Each reply allows for one management rating only ； 5. The answer and explanation will be visible after responding ； 6. The reply reward is valid for 48 hours. Studying* and winning awards again; come by here every day. 1. (Multiple choice) Which of the following structures can independently handle the task of balancing the axial forces in a centrifugal pump? ( ) A. Balance holes in the impeller B. Double-suction impeller C. Balance disk in a multi-stage pump D. Pump casing with dual flow channels 2. (True/False) If the vaporization pressure of a liquid at 80°C is 150 KPa, then at this temperature, when the pressure gauge reads 0.1 MPa, the liquid will vaporize. ( ) There are 3 days left until the May Day holiday. Answer: 1, B (The balance hole must be used in conjunction with the rear ring.) ； The balance disc is used at least in conjunction with the balance tube, and is often used together with the balance drum ； A dual-channel pump body is a structure for balancing radial forces ； 2. Wrong. (150 KPa(A) = 0.15 MPa(A) as absolute pressure; 0.15 MPa(A) – 0.1 MPa(A) = 0.05 MPa(G) as gauge pressure. Since this value is less than 0.1 MPa(G), vaporization does not occur.