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【每日一题 泵设备】填空题2019.3.29

2019-03-29View Original

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本帖最后由 3983596_FPPZ 于 2019-3-29 14:27 编辑 bk14.jpg1、两个题(空)回答全错给予积极参与+2财富,回答一错一对给予+5财富,回答全对给予+8财富。2、如只回复一个答案,除非明确了是哪道题的答案,正确+5财富,错误+2财富,否则一律按积极参与+2财富执行。3、回答奖励每人限一次。4、每个回复限评分一人次。5、回复后可见答案及答案解释。6、奖励在48小时内有效,逾期不予奖励。 学*又拿奖,天天来逛逛 1、在离心泵的各种损失中,容积损失随着流量增大,会逐渐( ); 2、离心泵额定点:流量50m3/h,扬程32m,转速2900r/min,则该泵的比转数ns为( )。 答案: 1、变小(流量变大,扬程变低,压差变小,所有回流处泄漏量变小,容积损失变小,容积效率提高); 2、92.72(ns = 3.65nQ^0.5/H^0.75 式中 ns ——比转数;Q——流量m^3/s,; H—— 扬程m;n—— 转速 r/min)。
Reply #22019-03-29
1、变小;2、92.72。
Reply #32019-03-29
1、变大 2、444.4
Reply #42019-03-29
1、变小 2、92.717
Reply #52019-03-29
1,不变;2,92.7.
Reply #62019-03-29
1、变小,2、92.72

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