【Daily Question: Pump Equipment】Fill-in-the-blank and True/False Questions, 2019.6.13

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This post was last edited by 3983596_FPPZ on 2019-6-14 09:33. Rules for answering questions and managing the post: 1. If all answers to a question are incorrect, those who participate actively will receive 2 units of wealth as a reward; replies that are not answers will not be rewarded； 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. Fill in the blank: A single-stage, single-suction, cantilevered horizontal centrifugal pump uses a mouth ring + balance hole design to balance the axial force. The inlet pressure of the pump is 0 MPa(A). The inner diameter of the pump cover’s mouth ring is 220 mm, while the outer diameter of the rear mouth ring of the impeller is 219.4 mm. The impeller has 5 blades; therefore, the diameter of each balance hole on the impeller should be ( ) mm ； 2. Judgment: Jet pumps do not fall under the category of positive displacement pumps ( ). Answer: 1, 18 (interstitial ring band cross-sectional area at the rear mouth ring x 6 / 5 holes) ； 2. Correct