泵与风机 pdf(考研英语：如何正确使用泵与风机？)

bump and fan are two of the most important pieces of equipment in the field of mechanical engineering. they provide the necessary power for the most complicated and intricate processes of operation. and these two pieces of equipment are often used together in many effective ways.
first of all, pumps and fans are used to provide the necessary oxygen and air for many different machines and systems. without these two pieces of equipment, the proper functioning of the engines and machines cannot be sustained. likewise, pumps and fans are also essential components in the cooling and reheating process of chillers, evaporators, boilers, air-cons, heat exchangers and many more.
another application of both pump and fan is in supplying and transferring cooling liquids or compressed air these liquids, alon with specially setup pipes, effectively transfer heated and cooled gadgets and machines. furthermore, turbines, multistage compressors, boosters and large scu’s also make great use of small pumps and fans, pairing them up to replace old fashioned systems that have been around for decades.
overall, when combined with a well-maintained piping system and also used sensibly and economically, these two awesome pieces of machinery ensure that most of our mechanical works are both cost and energy efficient. from manufacturing units and modern day machines, to industry requirements and mid to high level politics, pumps and fans pdf serve their purpose well with each measurable of constraint or else their absence or not working condition unleashes a horrible and difficult saga provided, in many ways.

泵与风机第四版课后答案

卷】
Ⅰ 单选题
1.风机产生的动力是 a
(a.空气涡流动；b. 机械力；c. 电力；d. 蒸汽动力)
2.关于压力与压强，以下哪句描述正确 c
(a.压力强大，压强便高；b.压力强大，压强便低； c.压力小，压强便低；d.压力小，压强便高)
3.正确表示同一极性电池中正负极极化积累电荷量的公式为 b
(a.a+c-b=q； b.a+b-c=q；c.a+c+b=q；d.a+b+c=q)
4.对于有害，无害污物扬排处理，下列描述不正确的是 d
(a.有害污物，如漂白液一般用盐工海水后处理；b. 无害污物如废水一般可回用于用户、洗网； c.有害污物如漂白液一般在干式塔中处理；d. 无害污物如废水一般塔上处理)
5.下列不属于污水处理技术的是 d
(a.活性污泥；b.膜工艺；c.生物沉积；d. 蚀刻技术)
Ⅱ 多选题
1.以下属于主要常见机械给水系统中辅助装备的是 abd
(a.压力控制设备；b. 热力供应设备；c.水力驱动设备；d. 过滤除垢装置）
2. 正向叶轮的极面供送主要具备的特征为 abc
(a.机械实际功率；b. 流量适应能力；c.阻力和轶跃分别设计；d. 动能替代回推能力)
3. 电磁潜水泵的优点有 abc
(a.泵的安装要求低；b.自吸能力强；c. 抗堵能力高；d.污水搅拌性能好)
4. 以下属于阀门主体部分结构的是 abc
(a.口径长度；b. 驱动旋转；c.可调密封面；d. 阀杆勒紧装置）

泵与风机第五版课后思考题答案

1、下列关于交流电动机保护装置的说法中，正确的有（ ）
a、交流电动机过载保护器只能辨别交流电动机的负载变化
b、交流电动机过流保护器可以延长电抗器额定电流的使用时间
c、交流电动机过温器可防止交流电动机的过热
d、交流电动机多功能保护器不能预防电机的过流
答案：a、c、d