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2019-05-24View Original

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本帖最后由 3983596_FPPZ 于 2019-5-24 09:37 编辑 bk14.jpg答题及管理规则:1、每题答案全部错误,积极参与奖励2财富;2、答案部分(答对一道)正确奖励5财富;答案全部正确奖励8财富;3、回答奖励每人限一次;4、每个回复限管理评分一次;5、回复后可见答案及解释;6、回复奖励在48小时内有效。 学*又拿奖,天天来逛逛 1、已知电网频率为50Hz,电机机极数是4极,电机转差率为2.8%,则电机此时转速为( )r/min; 2、泵入口管径为DN100,流量为80m3/h,则入口管内介质的平均流速为( )m/s。 答案:1、50x60/2=1500,1500x(1-2.8%)=1458; 2、4x80/(36x3.14159)=2.83
Reply #22019-05-24
1、1458; 2、2.83
Reply #32019-05-24
1, ~ 2, 2.83
Reply #42019-05-24
1、1458; 2、2.83
Reply #52019-05-24
1. 2. 2.83m/s
Reply #62019-05-24
1、1458 2、2.83
Reply #72019-05-24
1458r/min,2.83m/s
Reply #82019-05-24
1、1500x(1-2.8%)=1458;??2、4x80/(36x3.14159)=2.83
Reply #92019-05-24
1、1458 2、2.83
Reply #102019-05-24
1、1500 2、2.83
Reply #112019-05-24
1、1458;??2、2.83

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