2013-2014学年第1学期华南农业大学大学物理A试卷_考试用讲诉

2013/2014学年第一学期期末考试试卷（A卷）科目：《大学物理》考试班级：燃气121-2，热能121，勘查121-2、信工121、信科121、电气121-2、智能121-2、自动化121、建环121-2、给排水121-2、环科121、测绘121-2、软件121、计算机121、网络121、地信121、机械121 考试方式: 闭卷命题人签字：教研室主任签字：教学院长签字：()cos sin r t a ti b tj ω=+，求质点从沿一直线运动，则它对该直线上任一点的角动量为、一质点同时参与三个简谐振动，它们的振动方程分别为：的质点，沿x 轴作直线运动，受到的作用力为00v =。

求质点在任意时刻的速度和位置。

四、一根放在水平光滑桌面上的匀质棒，可绕通过其一端的竖直固定光滑 = 1.5 kg ，长度为一水平运动的子弹垂直地射入棒的另一端，并留在棒中，如图所示．子弹(1) 棒开始和子弹一起转动时角速度ω有多大？(2) 若棒转动时受到大小为M r = 4.0 N·m 的恒定阻力矩作用，棒能转过多大的角度。

五、五题图中（a ）表示t=0时刻的波形图，（b ）表示原点（x =0）处质元的振动曲线，试求：（１）原点处质元的初位相，振动方程（２）该波的波动方程。

六、0.32kg 的氧气作图中所示循环ABCDA ，设212V V =，1300T K =，2200T K =. 求循环过程中（1）内能的改变E ∆，（2）所做的净功A ，（3）吸收的热量1Q 。

（4）循环效率η（已知氧气的定体摩尔热容的实验值11,21.1V m C J mol k --=⋅⋅）七、两均匀带电无限长直共轴圆筒，内筒半径为a ，沿轴线单位长度电量为λ+，外筒半径为b ，沿轴线单位长度电量为λ-，外筒接地,试求：（１）离轴线为r 处的电势；（２）两筒的电势差八、如题图所示，长直电流1I 附近有一等腰直角三角形线框，通以电流2I ，两者共面。

华南农业大学期末考试试卷（A 卷）一．填空题（每题3分，共24分）二、选择题（每题3分，共24分）三、（本题8分） 解：2,AX A X =+ (2)A E X A ∴-=1012110012A E ⎛⎫⎪-=- ⎪ ⎪⎝⎭又……………………………………………3分()1013012110110012014A EA ⎛⎫ ⎪-=- ⎪⎪⎝⎭由于100522010432001223--⎛⎫⎪-- ⎪ ⎪-⎝⎭→初等行变换522432.223X --⎛⎫⎪∴=-- ⎪ ⎪-⎝⎭……………………………………8分四、（本题8分）解：12341212310121321031αααα-⎛⎫⎛⎫⎪ ⎪- ⎪⎪= ⎪ ⎪- ⎪ ⎪--⎝⎭⎝⎭ → … → 12121100102000030112-⎛⎫ ⎪ ⎪⎪ ⎪⎪⎪⎪⎝⎭……………………4分向量组的秩为3， 1α，2α，4α（或1α，3α，4α）为一个极大线性无关组（答案不唯一）…………………………………………………………………………8分五、（本题6分）解：因为A 是2007阶正交矩阵，所以AA A A E ''==于是，A E A A A '-=- ()A E A '=-A E A ''=⋅- ……………………………3分()A E A '=⋅-2007(1)A E A A A E =⋅-=⋅--……………………5分又因为1A =，所以A E A E -=--，故0A E -=。

…………………………6分六、（本题12分）解：（1）1111011λλλ≠，即1,2λ≠-时方程组有唯一解；…………………2分（2）()()R A R B <2221111111011(1)1100(1)(2)(1)(1)~B λλλλλλλλλλλλλλλ⎛⎫ ⎪=--- ⎪ ⎪-+-+⎝⎭⎛⎫ ⎪ ⎪⎝⎭………4分 由2(1)(2)0,(1)(1)0λλλλ-+=-+≠，得2λ=-时，方程无解； ………6分 （3）()()3R A R B =<，由2(1)(2)(1)(1)0λλλλ-+=-+=，得1λ=时，方程组有无穷多个解。

华南农业大学期末考试试卷（B 卷）2013-2014学年第 1 学期 考试科目： 大学物理A 考试类型：（闭卷）考试 考试时间： 120 分钟学号 姓名 年级专业物理常量：-11K 31.8∙∙=-mol J R一、填空题（本大题共15小题，每题2分，共30分）1、一质点作平面运动的位置矢量表达式为j bt i at r 22+=（其中a 、b 为常量），则该质点的加速度为 。

2、一质点沿半径为R 的圆周按规律2021bt t v S -=运动，0v 、b 都是常数，则t时刻质点的切向加速度为 。

3、一颗子弹在枪筒里前进时所受的合力大小为t F 31044005⨯-=，假设子弹离开枪口时合力刚好为零，则子弹在枪筒中所受力的冲量大小为 s N ⋅。

4、花样滑冰运动员绕过自身的竖直轴转动，开始时两臂伸开，转动惯量为0J ，角速度为0ω。

然后她将两臂收回，使转动惯量减少为3/0J ，这时她转动的角速度变为 。

5、两个同振动方向、同频率、振幅均为A 的简谐运动合成后，振幅仍为A ，则这两个简谐运动的相位差为 。

6、已知一平面简谐波的波长为m 1=λ，振幅为m A 1.0=，周期为s T 5.0=。

该波的传播方向为x 轴正方向，并以振动初相为零的点为x 轴原点，则波动方程为=y m 。

7、A 、B 、C 三个容器中皆装有理想气体，它们的分子数密度之比为1:2:4::=C B A n n n ，而分子的平均平动动能之比为4:2:1::=c B A εεε，则它们的压强之比=C B A p p p :: 。

8、一台工作于温度分别为327℃和27℃的高温热源与低温热源之间的卡诺热机，每经历一个循环吸热2000J ，则对外作功 J 。

9、静电场的环路定理的数学表达式为 。

10、两个同心球面的半径分别为1R 和2R ，各自带有电荷1Q 和2Q ，则两球面的电势差为 。

11、已知一电场的电势分布为22U x xy =+，则电场强度E = 。

华南农业大学期末考试试卷（A 卷）2012-2013学年第1学期 考试科目： 大学物理AII 考试类型：（闭卷）考试 考试时间： 120 分钟 学号 姓名 年级专业参考数据．．．．：电子质量kg m e 311011.9-⨯=；电子电量C e 19106.1-⨯=。

一、填空题（本大题共10小题，共10空，每空2分，共20分）1、平行板电容器两极板间的距离为d ，两极板的面积均为S ，极板间为真空，则该平行板电容器的电容=C dS0ε。

2、如图1所示一个假想的球面，其中心有一运动电荷，速度方向如图所示，则图中所标注的球面上的三个点，哪个点具有最大的磁感应强度 B点3、在静电场中，导体达到静电平衡的条件是 导体内部场强处处为零，即E ＝0 。

4、以速度v相对于地球作匀速直线运动的恒星所发射的光子，其相对于地球的速度大小为___ _____C __。

5、对于频率为ν的光子，其能量=E h ν 。

6、自然光从空气（n=1）入射到某介质表面上，当入射角为600时，反射光成为线偏振光，则此介质的折射率为7、电荷为q +，质量为m 的带电粒子，以初速率0v 进入磁感强度为B的均匀磁场中，且0v与B 垂直，若略去重力作用，则带电粒子的回旋半径=R qBmv 0。

8、真空中磁场高斯定理的数学表达式为 0=∙⎰S d B S。

图19、人眼的瞳孔直径约为3.0mm ，对视觉较为敏感的光波波长为550nm ，若在教室黑板上写一等号，其两横线相距6.71mm ，则人距离黑板 30 m 恰好能分辨这两条横线。

10、匀强电场的电场强度E与半径为R 的半球面对称轴平行，则通过此半球面的电通量=φ E R 2π 。

二、判断题（本大题共10小题，每小题1分，共10分。

对的填写．．．．√．，错的填写．．．．．×．。

请将判断题正确答案填在下面表格内，写在其它位置无效．．．．．．．．．．．．．．．．．．．．．．．．．。

）1、依照光源、衍射孔（或障碍物）、屏三者的相互位置，可把衍射分为夫琅禾费衍射和菲涅耳衍射。

华中农业大学本科课程考试试卷考试课程与试卷类型：大学物理学A （A 卷） 姓名：学年学期：2013-2014-2 学号：考试时间：2014-06- 班级：一、判断题（判断下列表述，正确的在答题纸上相应位置把T 涂黑，错误的在答题纸上相应位置把F 涂黑，每小题2分，共10分.）T F T T F二、单项选择题（从下列各题四个备选答案中选出一个正确答案，并将其代号在答题卡上相应的位置涂黑，每小题3分，共30分.）C D C C DB AC B B三、应用题（将解答过程填写在答题纸上相应位置，本题10分.）解：（1） 水降温过程设计成可逆过程，即与一系列热库接触，d =Q S T ∆⎰水水（2分） 273+78273+57d 280==ln 1.3810330Cm T S Cm T ⇒∆=-⨯⎰水 J/K （3分） （2）d =Q S T ∆⎰环境环境（2分） ()85771=d = 1.5102737Cm Q S Q T T -⇒∆==⨯+⎰环境环境环境 J/K （3分） 四、计算题（将解答过程填写在答题纸上相应位置，三小题，每题12分，共36分.）1. 解：（1）对等容过程，气体吸热：()()3,213400300 1.25102V m Q C T T R ν=-=-=⨯J ；（2分） 内能增量：31.2510U Q ∆==⨯J ；（2分） 对外做功：0A =．（2分）（2）对等压过程，气体吸热：()()3,215400300 2.08102p m Q C T T R ν=-=-=⨯J ；（2分） 内能增量：()3,21 1.2510V m U C T T ν∆=-=⨯J ；（2分） 对外做功：830A Q U =-∆=J ．（2分）2. 解：(1)水的熵变 612273103345.031=⨯⨯==∆T Q S J 1K -⋅ (3分)(2)热源的熵变570293103345.032-=⨯⨯-==∆T Q S J 1K -⋅ (3分) (3)总熵变4257061221=-=∆+∆=∆S S S J 1K -⋅ (3分)熵增加 (3分)3. 解：（1）自由电荷及电介质分布具有球对称性，作以点电荷q 为球心的同心球面为高斯面，由介质中的高斯定理：S S D d S q ⋅=∑⎰⎰ 内 （2分）r <R 时，2244Q D r Q D r ππ⋅=⇒=，124D Q E r επε∴==； 沿半径方向 （2分） r <R 时，2244Q D r Q D r ππ⋅=⇒=，22004D Q E r επε∴==；沿半径方向 （2分） （2）空间任一点的电势d a a V E l ∞=⋅⎰ （2分）r <R 时，12220011d d d d 4444R R r R r R Q Q Q Q V E r E r r r r r r R Rπεπεπεπε∞∞⎛⎫=+=+=-+ ⎪⎝⎭⎰⎰⎰⎰（2分） r <R 时，2200d d 44r r Q Q V E r r r r πεπε∞∞===⎰⎰ （2分）五、简答题（将解答过程填写在答题纸上相应位置，本题14分.）1. 答：接头短路后，线圈构成闭合回路．（2分）在磁场中摆动时，产生感应电流．（2分）感应电流方向满足楞次定律，即感应电流的方向使线圈受到阻止其摆动的力矩，于是摆动会迅速停止．（2分）2．答：分子热运动的剧烈程度会随着温度升高而增加，铁磁质中自发磁化区域因这种剧烈的运动而破坏，磁畴也就随之瓦解，铁磁质的铁磁性便会消失，铁钉掉落；（4分）反之，温度降低后，分子热运动也会趋于延缓，自发磁化区将恢复，磁畴重新形成，在外磁场的作用下重显铁磁性，铁钉重新被磁铁吸附。

华南农业大学期末考试试卷（A卷）2008学年第一学期考试科目：管理学基础考试类型：（闭卷）考试时间：120 分钟学号姓名年级专业[Pay attention: please write your answers in the answer sheet][注意：请把答案填写在答题纸上]I．True/False(1 point per statement, total 10 points)1．The four processes of management are completely independent and should be treated as separate activities. 2．Scientific management theorists believed there was "one best way" for a job to be done.3．Development of alternatives is the step between identification of decision criteria and allocation of weights to criteria.4．Individuals who prefer the team role of explorer-promoter are patient and usually have the control skills to ensure that the ideas are followed through in detail.5．If an individual is low in the authority hierarchy, he/she is also not close to the power core.6．Mintzberg found that managers—regardless of the type of organization or the level in the organization—perform similar roles.7．The norming stage of team development is one of intragroup conflict.8．In order to fulfill the grand strategy, managers will seek to position their units so that they can gain a relative advantage over their competition.9．According to Herzberg, working conditions and salary are examples of hygiene factors.10．The method of monitoring, comparing and correcting is what we called controlling process.II．Choose the only one correct answer for each question (2 point per question, total 40 points)1. Which of the following is not one of the six elements of structure?a) work specializationb) chain of commandc) span of controld) technology2. If a college cuts the cost by using mostly part-time teachers and at the same time fails to adequately educate its students, it can be said to be doing the wrong things well. In other words, the college is_____:a) efficient and effectiveb) efficient but not effectivec) effective but not efficientd) neither efficient nor effective3. _____ is the term used to describe the hypotheses of the scientific management theorists and the general administrative theorists.a)Contingency approachb)Human resourcesc)Human relationsd)Classical approach4. Michael Porter proposed that management must select a(n) _____ ,which will give its unit a distinct advantage by capitalizing on the strengths of the organization and the industry it is in.a)growth opportunityb)competitive strategyc)organizational chartd)vision5. An office supply firm that has three departments based upon retail, wholesale, and governmental customers is using which of the following types of departmentalization?a) functionalb) productc) customerd) geographic6. Mary Parker Follet was a social philosopher who taught that organizations should be based on _____ rather than _____.a)individualism; group ethicb)ethics; profitsc)efficiency; profitsd)group ethic; individualism7. Which of the following is not a result of work that has become too specialized?a)fatigueb)low productivityc)poor qualityd)lower turnover8. Creative College is opening a satellite（卫星）campus to accommodate working adults. Creative College is pursuing a(n) _____ strategy.a)acquisitionb)retrenchmentc)growthd)combination9. The management theory jungle was developed by_____.a)Maslowb)Herzbergc)Ouchid)Koontz10. Jim has the ability to "dock"(扣去) paychecks of employees who arrive at work past 9:05 AM. What kind of power does Jim possess?a)coercive powerb)legitimate powerc)expert powerd)referent power11. Linda has spent the day trying to determine what the role of their company. Goals were then developed based on their vision of the company's mission. Linda spent her day on the _____ process.a) planningb) organizingc) leadingd) controlling12. Which of the following is a hidden aspect of organizational behavior?a)strategiesb)technologyc)group normsd)formal authority13. Deborah's work team does its own hiring and scheduling and is even responsible for evaluating each other's performance. Deborah is part of a _____ team.a)self-managedb)virtualc)problem-solvingd)cross-functional14. Harry's Company apparently has overgrown its market. It can no longer compete successfully due to its size and formalization. Thus it is reducing its size in order to once again become competitive. This is known as which of the following strategies?a)growthb)stabilityc)retrenchmentd)combination15. Who developed Theory X and Theory Y?a)McGregorb)Maslowc)McClellandd)Herzberg16. Jill has been teaching for 18 years. Each day she arrives at work smiling and ready to teach another room full of students. She loves her job. This describes which of the following?a)job satisfactionb)job involvementc)organizational developmentd)organizational commitment17. When we describe people in terms such as quiet, introvert, aggressive or loyal, we are addressing _____.a)attitudesb)behaviorsc)needs and wantsd)personality traits18. A structure that is high in specialization, formalization, and centralization is a(n) _____.a)strategic organizationb)mechanistic organizationc)organic organizationd)matrix organization19. The managers who work most closely with the operatives are known as_____.a)top managementb)middle managementc)first-line managersd)operative managers20. Maslow's hierarchy of needs proposes that an individual begins by satisfying _____ needs.a)self-actualizationb)esteemc)physiologicald)safetyⅢNotion explanation. (4 points each notion, total 20 points)1.MBO2.Hawthorne effect3.Boundaryless organization4.Social loafing5.BenchmarkingIV Medium-length answer. (10 points each question, total 20 points)1.What are differences between functional and divisional structures? Give an example for these two types ofbureaucratic structure.2.What are Mintzberg’s managerial roles? Cite examples of activities managers you know would do whenperforming these roles.V Reading comprehension. (Choose the only one correct answer for each question. 2 point per question, total 10 points)Nike is the number one sports brand in the World. The market for sports shoes and garments(服装) is very competitive. Phil Knight (Founder and CEO) is often quoted as saying that ‘Business is war without b ullets.’The war is especially intense(激烈) in today’s economic declination. Over the past years, Nike has gained its success partly from the competency at research and development, as is evidenced by its evolving and innovative product range. However, the income of the business is still heavily dependent upon its share of the footwear market. Nike has no factories. It does not tie up cash in buildings and manufacturing workers. They then manufacture wherever they can produce high quality product at the lowest possible price. Interestingly, consumers that wear Nike product do not always buy it to participate in sport. Some would argue that in youth culture especially, Nike is a fashion(时尚) brand. Nike actively sponsors(赞助) activities such as the World Cup (soccer) and The Olympics to gain reputation in emerging markets such as China.1. Nike heavily depends upon the footwear market to make profit would be classified as which of the following?a) weaknessb) strengthc) threatd) opportunity2. The fact that the market for sports shoes and garments is very competitive would be which of the following?a) weaknessb) strengthc) threatd) opportunity3. Nike continues to bring evolving and innovative product range would be classified as which of the following?a) weaknessb) strengthc) threatd) opportunity4. Nike is a fashion brand among youngsters would be classified as which of the following?a) weaknessb) strengthc) threatd) opportunity5. The economic declination is a_____ factor for Nike.a) positiveb) neutralc) negatived) normal华南农业大学期末考试答题纸（A卷）2008学年第一学期考试科目：管理学基础考试类型：（闭卷）考试时间：120 分钟学号姓名年级专业II．Choose the only one correct answer for each question (2 points each question, total 40 points). Notion explanation. (4 points each notion, total 20 points)6.MBOManagement by objectives (2 points)Four elements: jointly determined objectives; explicit time period; specific objectives; periodically review (0.5 each)7.Hawthorne effectSocial norms or standards are the key determinants of individual behavior in a group. (4 points)8.Boundaryless organizationAn organization that is not defined or limited by boundaries or categories imposed by traditional structures; attempt to eliminate vertical, horizontal, and inter-organizational barriers. (4 points)9.Social loafingThe tendency of an individual in a group to decrease his or her effort because responsibility and individual achievement cannot be measured. (4 points)10.BenchmarkingSearching for best practices among competitors and noncompetitors. (4 points)IV Medium-length answer. (10 points each question, total 20 points)3.What are differences between functional and divisional structures? Give an example for these two types ofbureaucratic structure.Functional structure refers to an organization in which similar and related occupational specialties are grouped together. (1 point)The strength lies in the advantages that accrue from work specialization. Results in economies of scale, minimizes duplication, satisfy employees etc. (2 points)but people tend to lose sight of the best interests of the organization as a whole; no one function is totally responsible for the results. (2 points)A company divides its department into accounting, hr, producing, marketing employed the functional structure. (2 point)Divisional structure is made up of self-contained units. (1 point)It focuses on results, frees the headquarters staff from being concerned with operating details; but the major disadvantage lies in the duplication of activities and resources. (2 points)Companies like GE and PepsiCo have the divisional structure. (1 point)4.What are Mintzberg’s managerial roles? Cite examples of activities managers you know would do whenperforming these roles.Interpersonal—roles consist of being the figurehead for the organization, assuming the leadership role, and acting as a liaison for the organization. Examples (3 points)Informational—roles consist of being a monitor of current information which is then dispersed to employees needing that information; also involves being the spokesperson for the organization. Examples (3 points) Decisional—roles consist of being an entrepreneur for the organization, handling disturbances, allocating resources, and negotiating. Examples (4 points)V Reading comprehension. (Choose the only one correct answer for each question. 2 point per question,1. FTFFT FTTTTddcdc dbbcbH．FTTTF FTFTTAcbabcd3. FTFTF TFFFTccbcc dcbdc aadbc dacacdba5.TTFFF TFFTTDABDC CACAD C1.What is the difference between line authority and staff authority?Line authority entitles a manager to direct the work of an employee. Staff authority functions to support, assist, advise, and generally reduce some of the informational burdens of those with line authority.pare and contrast authority and power.●Authority comes from the position, not the person.●Power is the ability of an individual to influence decisions, which may not be reflected in their levelof authority. French and Raven suggested five bases of power: reward, coercive, legitimate, referent, and expert.●Authority is a two dimensional concept while the power is a three-dimensional one. One shouldmove up in the hierarchy to gain higher authority, but in order to be more powerful, managers could move up or move inward to have closer relationship with those people representing the power core.3.set an example to clarify each of five types of departmentalization that are available. Departmentalization types examples (departments in certain organization)Functional marketing, HR, R&D, financing etc.Product food, clothes, home appliances, etc.Customer personal clients, government, VIP etc.Geographic Great China, North America, EUProcess validation, registration, payment, etc.4.What is a matrix structure? What is its primary strength? What are its major disadvantages?●Matrix structure—an organization in which specialists from functional departments are assigned towork on one or more projects led by a project manager.●Primary strength—can facilitate coordination of a multiple set of complex and interdependentprojects, while still retaining the economies that result from keeping functional specialists groupedtogether.●Major disadvantages—creates confusion and has a propensity to sponsor power struggles.pare functional and divisional structure.Both are bureaucratic design of organizations.●Functional structure groups similar or related occupational specialties together. While divisionalstructure is self-contained, composed of autonomous units or divisions, with managers having fully responsibility for a product or service.●Advantages of functional structure accrue from work specialization. 1. putting like specialtiestogether results in economies of scale, minimizes duplication of personnel and equipment; 2. itmakes employees comfortable and satisfied since they have same interests.Chief advantage of divisional structure is that it focuses on results, also it frees the headquarters staff from operating details so that they can focus on long-term strategic planning.●Weaknesses of functional structure: organizational interests might be lost in pursuit of functionalgoals; no one function is totally responsible for results; members become insulated and have littleunderstanding about peers in other functions.The major disadvantage of divisional structure is the duplication of activities and resources.。

华南农业大学期末考试试卷（A 卷）2013~2014 学年第1学期 考试科目： 大学物理A 考试类型：（闭卷）考试 考试时间： 120 分钟 学号 姓名 年级专业物理常数：2/8.9s m g =，1231038.1--⋅⨯=K J k ，1131.8--⋅⋅=mol K J R一、填空题（本大题共14小题，15个空，每空2分，共30分）1. 一质点作直线运动，它的运动方程是2ct bt x +=，方程中b 、c 是常数，此质点的速度为=v_________ i 。

2. 一质点沿半径为R 的圆周按规律2021bt t v S -=运动，0v 、b 都是常数，求t 时刻质点的法向加速度大小=n a _____________，切向加速度大小=τa _______。

3. 一质量为m 的质点拴在细绳的一端，绳的另一端固定，此质点在粗糙水平面上作半径为r 的圆周运动。

设质点初速率是0v ，当它运动一周时，其速率变为2/0v ，则摩擦力所作的功W = 。

4. 若力F为保守力，则其沿闭合路径l 所做的功=⋅=⎰ll d F W。

5. 半径相同且质量相同的薄圆环和薄圆盘，转动轴为垂直于圆环/圆盘且过其圆心的几何轴，哪个的转动惯量更大 。

6. 从本质上来说，连续性原理体现了不可压缩的流体在流动中__________守恒。

7. 欲用内径为1cm 的细水管将地面上内径为2cm 的粗水管中的水引到5m 高的楼上。

已知粗水管中的水流速为4s m /，若忽略水的黏滞性，楼上细水管出口处的流速=v s m /。

8. 已知简谐振动m A 12.0=，s T 2=。

当0=t 时，m x 06.00=，此时，质点沿x 轴正向运动，该质点的振动方程=x m 。

9. 一个容器内贮有氧气，其压强51.01310P Pa =⨯，温度为27℃，则单位体积内的分子数n = 3m -。

10. 两个相同的刚性容器，一个盛有氢气，一个盛有氦气（均视为刚性分子理想气体）。

华南农业大学期末考试试卷A2013-2014学年 第 1 学期 考试科目： 电机学 考试类型：（闭卷）考试 考试时间： 60 分钟学号 姓名 年级专业一、单项选择题（本大题共10小题，每小题2分，共20分）1. 电机学中的基本电磁定律包括“电生磁、磁变生电、电磁生力”，此三项电磁学定律用公式可分别表示为： C 。

A. e=-Nd Φ/dt 、F=HL=Ni 、f em =Bil ；B. f em =Bil 、e=Blv 、F=Ni ；C. F=HL=Ni 、e= - d ψ/t 、f em =BilD. F=HL=Ni 、H=B/μ、e=Blv 。

2. 两个电感的尺寸、形状和线圈匝数均相同，但一个是铝心，一个是铁心，由于铁的导磁率远大于铝，当把它们并联接在同一个交流电源上时， B 。

A. 两电感电流是相同的； B. 铝心电感电流大于铁心电感电流； C. 铝心电感大于铁心电感； D. 铁心电感电流大于铝心电感电流。

3. 为保持单相变压器的主磁通波形为正弦波，考虑铁心饱和及铁损耗的影响，满载时实际励磁电流波形应该是 A 。

A ．超前Fe α角的尖顶波；B ．滞后Fe α角的正弦波；C ．同相位的正弦波； D. 同相位的尖顶波。

4. 一般情况下，三相变压器组(或三相组式变压器)不能接成 B 。

A. Yd 连接组；B. Yy 连接组；C. Dy连接组； D. Dd 连接组。

5. 额定容量为S N =100kVA ，额定电压为U 1N /U 2N =35000/400V 的三相变压器，其二次绕组额定电流为 A 。

A. 144.34A ；B. 250A ；C. 1.65A ；D. 2.86A 。

6. 在p 对极整距交流绕组中，每个线圈的两个线圈边在空间相距的机械角度为 D A. p ×180°; B. p ×360°; C. 360° / p D. 180° / p7. 交流绕组若采用短距，与整距比较各次谐波电动势会有所减少，其削弱幅度与谐波次数的关系是D。