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交大网校《泵与风机 》2 在线作业(答案)

交大网校《泵与风机 》2 在线作业(答案)
交大网校《泵与风机 》2 在线作业(答案)

《泵与风机》2在线作业答案

一、单选题(共 20 道试题,共 40 分。)

1. 两台泵并联运行时,为提高并联后增加流量的效果,下列说法中正确的是()

A. 管路特性曲线应平坦一些,泵的性能曲线应陡一些

B. 管路特性曲线应平坦一些,泵的性能曲线应平坦一些

C. 管路特性曲线应陡一些,泵的性能曲线应陡一些

D. 管路特性曲线应陡一些,泵的性能曲线应平坦一些

正确答案:A 满分:2 分

2. 下列说法正确的是()。

A. 在其它条件不变的情况下,泵叶轮进口处预旋总是会导致叶轮扬程较低;

B. 在其它条件不变的情况下,泵叶轮进口处预旋总是会导致小于90°;

C. 在其它条件不变的情况下,轴向旋涡运动总是会导致叶轮的理论扬程较低;

D. 泵叶轮进口处的自由预旋总是会导致小于90°。

正确答案:C 满分:2 分

3. 关于离心泵轴向推力的大小,下列说法中不正确的是()

A. 与叶轮前后盖板的面积有关

B. 与泵的级数无关

C. 与叶轮前后盖板外侧的压力分布有关

D. 与流量大小有关

正确答案:B 满分:2 分

4. 驼峰型qv-H性能曲线的特点是:在曲线最高点K点()

A. 为不稳定工作点,其余均为稳定工作区域

B. 右侧为不稳定工作区域

C. 附近为不稳定工作区域

D. 左侧为不稳定工作区域

正确答案:D 满分:2 分

5. 泵与风机的()大小不影响流量和扬程。

A. 容积损失

B. 机械损失

C. 流动损失

D. 冲击损失

正确答案:B 满分:2 分

6. 低压轴流通风机的全压为()

A. 1~3kPa

B. 5kPa以下

C. 3~15kPa

D. 15~340kPa

正确答案:B 满分:2 分

7. 风机的全压是指()通过风机后获得的能量。

A. 单位重量的气体

B. 单位质量的气体

C. 单位时间内流入风机的气体

D. 单位体积的气体

正确答案:D 满分:2 分

8. 离心式泵的主要部件不包括()

A. 叶轮

B. 汽缸

C. 机壳

D. 吸入室

9. 某风机用于输送320~420℃的气体,且气体中含有大量的灰粒,该风机的叶轮采用耐高温、高强度、不锈钢制造,机壳内壁衬有耐磨的锰钢衬板,轴承箱内设有水冷却装置,则该风机为()

A. 送风机

B. 引风机

C. 排粉风机

D. 再循环风机

正确答案:D 满分:2 分

10. 在下列调节方法中,泵不宜采用()。

A. 出口节流调节

B. 入口导流器调节

C. 变速调节

D. 汽蚀调节

正确答案:B 满分:2 分

11. 下列说法错误的是()。

A. 滑移系数K总是小于1;

B. 叶片排挤系数Ψ总是大于1;

C. 流动效率总是小于1;

D. 有实际意义的叶轮,其反作用度总是小于1。

正确答案:B 满分:2 分

12. 对轴流式泵与风机描述比较正确的是()。

A. 由于流体轴向流入、轴向流出叶轮,所以轴流式泵与风机的运行稳定性较好

B. 由于流体轴向流入、轴向流出叶轮,所以轴流式叶轮提高流体的动能较小

C. 由于流体轴向流入、轴向流出叶轮,所以流体得到的能量没有离心力作用项

D. 由于流体轴向流入、轴向流出叶轮,所以轴流式叶轮的流动损失较小

正确答案:C 满分:2 分

13. 同一台泵用于输送密度分别为ρ1和ρ2的液体时,保持转速不变且流动相似,其对应的扬程分别是H1和是H2,对应的轴功率分别为P1和P2,若ρ1>ρ2,则下列关系式中正确的是()

A. H1>H2P1=P2

B. H1=H2P1>P2

C. H1>H2P1>P2

D. H1=H2P1=P2

正确答案:B 满分:2 分

14. 下列对圆盘摩擦损失描述正确的是()。

A. 圆盘摩擦损失属于流动损失

B. 圆盘摩擦损失与转速的三次方、叶轮外径的五次方成正比

C. 圆盘摩擦损失随比转速的增大而增大

D. 多级泵的圆盘摩擦损失属于容积损失

正确答案:B 满分:2 分

15. 单位重量的液体从泵的吸入口到叶片入口压力最低处的总压降称为()

A. 流动损失

B. 必需汽蚀余量

C. 有效汽蚀余量

D. 摩擦损失

正确答案:B 满分:2 分

16. 由于叶轮中某点的绝对速度是相对速度和圆周速度的向量合成,所以()。

A. 绝对速度总是最大的;

B. 绝对速度的径向分速度总是等于相对速度的径向分速度;

C. 绝对速度流动角总是大于相对速度流动角;

D. 绝对速度圆周分速度的大小总是不等于圆周速度的大小。

17. 下列哪个参数与泵的有效汽蚀余量无关?()

A. 泵的几何安装高度

B. 流体温度

C. 流体压力

D. 泵的转速

正确答案:D 满分:2 分

18. 下列不同形式的轴流式风机中,哪一个在设计工况下出口气流的圆周分速度不为零?()

A. 单个叶轮

B. 单个叶轮加后置导叶

C. 单个叶轮加前置导叶

D. 单个叶轮加前后置导叶

正确答案:A 满分:2 分

19. 泵的()不一定属于容积损失。

A. 叶轮进口密封环处的泄漏

B. 轴封处的泄漏

C. 多级泵的级间泄漏

D. 平衡盘处的泄漏

正确答案:C 满分:2 分

20. 关于冲击损失,下列说法中正确的是()

A. 当流量小于设计流量时,无冲击损失

B. 当流量大于设计流量时,冲击发生在工作面上

C. 当流量小于设计流量时,冲击发生在非工作面上

D. 当流量小于设计流量时,冲击发生在工作面上

正确答案:D 满分:2 分

二、判断题(共 30 道试题,共 60 分。)

1. 目前最理想的调节方法是变速调节,具有很高的经济性。()

A. 错误

B. 正确

正确答案:B 满分:2 分

2. 音速传播速度很快,整个传播过程可作为等熵过程。()

A. 错误

B. 正确

正确答案:B 满分:2 分

3. 离心泵与风机启动时应关闭出口和入口阀门。()

A. 错误

B. 正确

正确答案:A 满分:2 分

4. 水泵的安装高度取决于水泵的允许真空值、供水流量和水头损失。()

A. 错误

B. 正确

正确答案:B 满分:2 分

5. 多级离心泵平衡轴向推力的装置一般采用平衡盘平衡。()

A. 错误

B. 正确

正确答案:B 满分:2 分

6. 当泵的入口绝对压力小于输送流体温度对应下的饱和温度时,泵将会发生汽蚀现象。()

A. 错误

B. 正确

正确答案:B 满分:2 分

A. 错误

B. 正确

正确答案:A 满分:2 分

8. 当泵的吸上真空高度小于最大吸上真空高度时,泵不会发生汽蚀。()

A. 错误

B. 正确

正确答案:A 满分:2 分

9. 流体在圆管中作层流运动时,其沿程阻力损失与速度的二次方成正比。()

A. 错误

B. 正确

正确答案:A 满分:2 分

10. 叶片出口方向与叶轮的旋转方向相反,这种叶型叫做前向叶型。()

A. 错误

B. 正确

正确答案:A 满分:2 分

11. 对于薄壁小孔口出流的全部完善收缩,流量系数为0.82。()

A. 错误

B. 正确

正确答案:A 满分:2 分

12. 欧拉数是惯性力和弹性力的比值。()

A. 错误

B. 正确

正确答案:A 满分:2 分

13. 容积式泵与风机是通过改变工作室容积大小实现工作的。()

A. 错误

B. 正确

正确答案:B 满分:2 分

14. 两台同型号的泵并联工作时,扬程等于单台泵的扬程,流量等于两台泵独立工作时流量之和。()

A. 错误

B. 正确

正确答案:A 满分:2 分

15. 叶轮后弯叶片型泵与风机易引起电机过载,叶片前弯叶片型泵与风机电机不易过载。()

A. 错误

B. 正确

正确答案:A 满分:2 分

16. 动叶调节可以扩大泵与风机的高效区,调节经济性高。()

A. 错误

B. 正确

正确答案:B 满分:2 分

17. 流线是光滑的曲线,不能是折线,流线之间可以相交。()

A. 错误

B. 正确

正确答案:A 满分:2 分

18. 两台同型号的泵串联工作时,扬程等于两台泵单独工作时扬程之和,流量等于单台泵的流量。()

A. 错误

B. 正确

正确答案:A 满分:2 分

19. 防止泵与风机不稳定工作的措施是:限制最小流量,避免工作点落在不稳定区域。()

A. 错误

正确答案:B 满分:2 分

20. 出口节流调节是效率最高的调节方法。()

A. 错误

B. 正确

正确答案:A 满分:2 分

21. 泵的调节可以采用吸入口节流调节。()

A. 错误

B. 正确

正确答案:A 满分:2 分

22. 引起局部阻力的原因是由于旋涡区的产生,而不是速度方向和大小的变化。()

A. 错误

B. 正确

正确答案:A 满分:2 分

23. 性能相同的两台泵与风机串联后,流体获得的能头等于单台转机的能头的2倍。()

A. 错误

B. 正确

正确答案:A 满分:2 分

24. 流体的质量力是作用在所考虑的流体表面上的力。()

A. 错误

B. 正确

正确答案:A 满分:2 分

25. 某点的绝对压强小于一个大气压强时即称该点产生真空。()

A. 错误

B. 正确

正确答案:B 满分:2 分

26. 平衡孔和平衡管都可以平衡泵的轴向推力,但增加了泵与风机的容积损失。()

A. 错误

B. 正确

正确答案:B 满分:2 分

27. 描述流动是一固定空间、固定断面或固定点为对象,应采用欧拉法。()

A. 错误

B. 正确

正确答案:B 满分:2 分

28. 水泵的扬程就是指它的提水高度。()

A. 错误

B. 正确

正确答案:A 满分:2 分

29. 曲面附面层分离发生在断面逐渐扩大而压强沿程增加的区段内,即增压减速区。()

A. 错误

B. 正确

正确答案:B 满分:2 分

30. 静止的液体和气体接触的自由面,它既是等压面,也是水平面。()

A. 错误

B. 正确

正确答案:B 满分:2 分

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交大网络大学英语三模拟考试

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上海交通大学继续教育学院模拟试题 大学英语三 第一部分交际用语(10分) 此部分共有10个未完成的对话,针对每个对话中未完成的部分有4个选项,请从A.B.C.D 四个选项中选出正确选项。 1. -- Do you mind my smoking here? -- _______________. A. No, thanks B. Yes, I do C. Yes. I’d rather not D. Good idea 2. -- Do you think Tom is ill? -- _______________. A. No, I don’t think so B. Yes, he’s very well C. Yes, I like him very well D. No, I was ill yesterday 3. -- Jim, please don’t put your head out of the window on the bus. It’s dangerous! -- _______________. A. Good idea B. Sorry, I won’t do it again C. It doesn’t matter D. It’s good 4. -- I hear you are moving into a new apartment soon. -- _______________ A. Yes, who told you that? B. No, I never do anything like that. C. Yes, but it’s more expensive. D. No, no way. 5. -- How many languages does Peter speak? -- _______________. A. Many languages B. Pretty well C. Four languages D. With his roommates 6- Could you tell me where the nearest parking lot is? - _________ A. Don't ask me. B. Parking is very difficult. C. Sorry, I'm a stranger here. D. Sorry, you can't park here. 7- Will you come to my birthday party this Sunday? - _________ A. I'm very busy. B. Ok, I don't. C. Ok, I do. D. Ok, I will. 8- Excuse me, when does the next flight from Paris arrive? - _________ A. In half an hour. B. An hour before. C. Until the next one. D. Before another one. 9- This is Bill speaking. May I speak to Mr. Smith? - _________. Here he comes. A. No, speaking. B. Don't go away. C. Who are you? D. Hold on.

交大英语作业(答案版)

Unit 1 1.—You speak very good English. — ___________________. A. No, my English is poor B. Don’t say that C. Thank you D. It’s a pleasure 2.— __________ have dinner with me this evening? —Yes. It’s very kind of you. A. Would you like to B. Don’t you like to C. Why don’t you D. Shouldn’t you 3. - I’m afraid Susan’s question made you angry. - ______. If I had been angry, I would have refused to answer. A. Do be afraid B. You are right C. Don’t worry D. Yes, it did 4.-I’m afraid I’ve got a terrible flu. -______________________. A. Never mind B. Keep away from me C. Better go and see a doctor. D. You need to be more careful 5.-It’s cold in here. Do you mind if I close the door?-______________________. A. With pleasure B. Yes, please C. Of course not D. Thank you 6.-I’m going to America for a holiday next week.-______________________. A. Goodbye B. Wish you success C. For sure D. That’s great 7.-Would you like a cup of coffee? -______________________. A. It’s very kind of you. B. No, I wouldn’t C. Yes, please D. Here you are 8. -Haven't seen you for ages. _______ -I've been in California for the past month. A. What are you up to recently? B. How soon will you be back? C. What are you going to do? D. Where did you hide? 9.-Can I borrow your camera for a week?-______________________. A. Sure, here you are B. Yes, you can borrow C. Yes, bring it with you D. It doesn’t matter 10.-Sorry, I have kept you waiting. -______________________. A. That’s all right B. I don’t care C. I’m sad D. No, not at all. Unit 2 1.-Mary, your dress is really beautiful. How is John?- . A. Thank you very much. B. No, no, John is not bad. C. Thank you. He is fine. D. Don’t say that. It’s ugly. John is good. 2.-Do you mind telling me where you’re from?- . A. Certainly. I’m from London. B. Sure. I was born in London. C. Not really, you can do it. D. Certainly not. I’m from London. 3.-May I see t he menu, please? I’ve been waiting an hour already.- . A. That is the menu, sir. B. Yes, please go on. C. Here you are, sir. D. Of course, sir. 4.-I was worried about chemistry, but Mr. Brown gave me an A! - . A. Don’t worry about it. B. Congratulations! That’s a difficult course. C. Mr. Brown is very good. D. Good luck to you! 5.—Did Tom tell you to water the flowers? -___________________. A. No. And so did I B. No. And neither did I C. He did. And so I did D. He did. And so do I 6.—Shall we sit up here on the grass or down there near the water? — _____________. A. I’d rather stay here if you don’t mind B. Sorry, I don’t like neither

上海交大---嵌入式第一次作业

题目1 完成 满分1.00 Flag question 题干 下列哪个不是嵌入式系统的特点:()选择一项: a. 专用性 b. 资源受限 c. 功耗约束 d. 常由外接交流电电源供电 题目2 完成 满分1.00 Flag question 题干 下列哪些不是嵌入式系统:()。 选择一项: a. 移动电话、手机 b. MP3 c. MID

d. 深蓝超级计算机 题目3 完成 满分1.00 Flag question 题干 指令和数据共享同一总线的体系结构是()。选择一项: a. 冯?诺依曼结构 b. 哈佛结构 c. RISC d. CISC 题目4 完成 满分1.00 Flag question 题干 下面不属于 ...嵌入式处理器的是:()。 选择一项: a. Intel Core(酷睿)处理器

b. Intel Atom处理器 c. MCS-51单片机 d. ARM处理器 题目5 完成 满分1.00 Flag question 题干 在嵌入式处理器与外部设备接口中,使用2根线实现多对多双向收发的是:()。 选择一项: a. UART b. I2C c. SPI d. USB 题目6 完成 满分1.00 Flag question 题干 假设使用奇偶校验位,UART发送一个字节的数据,从idle状态开始(及数据线为高),到允许进行下一次发送动作态为止,至少需要()个时钟节拍。

选择一项: a. 8 b. 9 c. 10 d. 11 题目7 完成 满分1.00 Flag question 题干 关于SIMD说法错误 ..的是:()。 选择一项: a. SIMD通过复制ALU和寄存器组,共享取值、译码单元来获得计算并行。 b. SIMD是通过增加寄存器个数来提高数据处理的宽度。 c. SIMD中多个运算单元运行的是相同的指令。 d. Intel Atom的SSE指令属于SIMD指令 题目8 完成 满分1.00 Flag question 题干

交大网络大学英语三 模拟试卷

上海交通大学继续教育学院模拟试题 大学英语三 第一部分交际用语(10分) 此部分共有10个未完成的对话,针对每个对话中未完成的部分有4个选项,请从A.B.C.D 四个选项中选出正确选项。 1. -- Do you mind my smoking here? -- _______________. A. No, thanks B. Yes, I do C. Yes. I’d rather not D. Good idea 2. -- Do you think Tom is ill? -- _______________. A. No, I don’t think so B. Yes, he’s very well C. Yes, I like him very well D. No, I was ill yesterday 3. -- Jim, please don’t put your head out of the window on the bus. It’s dangerous! -- _______________. A. Good idea B. Sorry, I won’t do it again C. It doesn’t matter D. It’s good 4. -- I hear you are moving into a new apartment soon. -- _______________ A. Yes, who told you that? B. No, I never do anything like that. C. Yes, but it’s more expensive. D. No, no way. 5. -- How many languages does Peter speak? -- _______________. A. Many languages B. Pretty well C. Four languages D. With his roommates 6- Could you tell me where the nearest parking lot is? - _________ A. Don't ask me. B. Parking is very difficult. C. Sorry, I'm a stranger here. D. Sorry, you can't park here. 7- Will you come to my birthday party this Sunday? - _________ A. I'm very busy. B. Ok, I don't. C. Ok, I do. D. Ok, I will. 8- Excuse me, when does the next flight from Paris arrive? - _________ A. In half an hour. B. An hour before. C. Until the next one. D. Before another one. 9- This is Bill speaking. May I speak to Mr. Smith? - _________. Here he comes. A. No, speaking. B. Don't go away. C. Who are you? D. Hold on.

上海交大16秋网络继续教育综合英语(一)第一次作业

综合英语(一)(高/专) 题目1 还未回答 满分1.00 标记题目 题干 28. _____ while the iron is hot. 选择一项: a. Strike b. Hit c. Stick d. Beat 题目2 还未回答 满分1.00 标记题目 题干 20. There are signs _______ restaurants are becoming more popular with families. 选择一项: a. which b. whose c. in which d. that

题目3 还未回答 满分1.00 标记题目 题干 35. The thought of seeing her again was all that ____ him. 选择一项: a. obtained b. retained c. sustained d. maintained 题目4 还未回答 满分1.00 标记题目 题干 3. —— My brother Jerry was promoted PR manager last month. ——_________. 选择一项: a. Oh, please b. Good for you c. Ok, if you like d. Congratulations 题目5

满分1.00 标记题目 题干 22. Doctors predicted that the baby would not survive with such ____ disabilities. 选择一项: a. mild b. strict c. slight d. severe 题目6 还未回答 满分1.00 标记题目 题干 26. His trousers _____ when he tried to jump over the wall. 选择一项: a. burst b. split c. broke d. cracked 题目7 还未回答 满分1.00

交大网络大学英语(二)作业一(语法30题)

题目1 We were all surprised when he made it clear that he _____________office soon. 选择一项: a. Leaves b. would leave c. had left d. left 反馈 正确答案是:would leave 题目2 His salary as a driver is much higher than ________. 选择一项: a. as a porter b. that of a porter c. a porter d. is a porter 反馈 正确答案是:that of a porter 题目3 It is said that______ boys in your school like playing football in their spare time, though others prefer basketball. 选择一项: a. quite a little b. quite a bit

c. quite a few d. very little 反馈 正确答案是:quite a few 题目4 My father is leaving ______Shanghai tomorrow. 选择一项: a. For b. to c. In d. Into 反馈 正确答案是:For 题目5 Don't forget ________ the window before leaving the room. 选择一项: a. having closed b. to have closed c. closing d. to close 反馈 正确答案是:to close 题目6 In the fourth paragraph, “a high priority” means _________ 第四段中的“a high priority”是什么意思

2015交大网院大学英语一第一次作业

Do you often wait for a long time ______the bus stop?选择一项: a. under b. at c. in d. in 题目2 正确 获得1.0分中的1.0分 标记题目 题干 My father is leaving ______Shanghai tomorrow. 选择一项: a. In b. Into c. For d. to 题目3 正确 获得1.0分中的1.0分 标记题目 题干 Don't laugh ________ people when they are _____trouble.选择一项: a. at… in… b. in….at… c. o n… in… d. at….at… 题目4

正确 获得1.0分中的1.0分 标记题目 题干 Our house is about a mile from the railway station and there are not many houses _______. 选择一项: a. in between b. far apart c. among them d. from each other 题目5 正确 获得1.0分中的1.0分 标记题目 题干 The baby is hungry,but there's ____ milk in the bottle. 选择一项: a. little b. few c. a little d. a few 题目6 正确 获得1.0分中的1.0分 标记题目 题干

Little Tom is used to getting up _______eight every morning. 选择一项: a. on b. in c. at d. of 题目7 不正确 获得1.0分中的0.0分 标记题目 题干 Robert, there's a man at the front door, saying he has _____news of great importance. 选择一项: a. an b. / c. a d. the 题目8 正确 获得1.0分中的1.0分 标记题目 题干 They all go outing on such a warm spring day ______ Mark. He is busy with his lessons now. 选择一项: a. except for b. besides c. except d. beside

交大网络大学英语(二)期末考试复习题-学生版

第一部分:交际用语(来自课后练习及统考题库)1.-What can I do for you? -____B_____ A. Let me have a watch. B. Could you show me the watch? C. Yes, you can. Give me the watch. D. The watch, please don't give me the pen. 2.- I don't know how to thank you enough. -__C_______. A. No thanks B. Thank you, too C. Never mind D. It's nothing 3. --- I'm sorry I broke your mirror. --- Oh, really? ____A___. A. It doesn't matter B. Don't be sorry C. Not at all D. It's OK with me 4. -Could you help me put up the signs on the wall? -_____A__. A. No problem B. I hope so C. That's all right D. That's a good idea 5. - Peter, don't step on the grass. - ___D_________. A. It doesn't matter B. I can't do it C. Don't worry D. Sorry, I won't do it again 6. --- The summer vacation is coming in a few days. I'll share the holidays with my daughter by traveling. ---- ____C__ A. Congratulations! B. Nice to meet you! C. Have a good trip! D. It's very kind of you. 7. ---What are Johnson's family like? ---____D___. A. His family is just like mine B. They all like sports and travel C. Oh, it's really a big one D. They are all warm-hearted and helpful 8. --- Is there a table for 4, please? ----____B__, please. Is the one near the backdoor OK? A. Take your time B. This way C. You are welcome D. After you 9. -Would you mind closing the window? It is windy outside. -____B____ A. Not at all. B. Sure, go ahead. C. Why not? D. Yes, I would. 10. ---Can I get you a drink? ---____A___. But I have already got one. A. That's very nice of you B. No, you don't have to

第一次作业(语法30题)

正确 获得1.00分中的1.00分 Flag question 题干 There's no food in the fridge. They _______shopping. 选择一项: a. Go b. are going to go c. are going d. are go 反馈 正确答案是:are going 题目2 正确 获得1.00分中的1.00分 Flag question 题干 Peter worked so fast with the maths problems ______ a lot of mistakes. 选择一项: a. that he made b. as to make c. to make d. that made 反馈 正确答案是:that he made

正确 获得1.00分中的1.00分 Flag question 题干 You needn't make such a funny noise, _______? 选择一项: a. need it b. don't you c. doesn't it d. need you 反馈 正确答案是:need you 题目4 正确 获得1.00分中的1.00分 Flag question 题干 It ________that they had no idea at the moment. 选择一项: a. is seamed b. was seemed c. is seeing d. Seemed 反馈 正确答案是:Seemed

正确 获得1.00分中的1.00分 Flag question 题干 It’s high time that he settled down in the country and _________ a new life. 选择一项: a. to start b. start c. started d. starting 反馈 正确答案是:started 题目6 正确 获得1.00分中的1.00分 Flag question 题干 The car accident happened at _______crossroads a few metres away from_______bank. 选择一项: a. /; a b. the; / c. /; the d. the; the 反馈 正确答案是:the; the

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