【Daily Question: Pump Equipment】Fill-in-the-blank question, May 23, 2019

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The last edit to this post was made by 3983596_FPPZ on 2019-5-23 at 13:16; the file bk14.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. In the answer section, a correct answer earns 5 wealth points ； 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. The width of a standard flat key with a shaft diameter of φ42mm should be ( ) mm; 2. The inlet gauge pressure of the centrifugal pump is 0.3 MPa, its head is 125 m, the inlet and outlet diameters are equal, and the specific gravity of the fluid is 0.8. Ignoring other factors such as viscosity or the height difference between the pump’s inlet and outlet, the gauge pressure at the pump’s outlet should be ( ) MPa. Answer: 1, 12 ； 2, 1.28 or 1.3