(整理)课堂测验答案整理
20141229_电机学第4次课堂测验_同步电机最终版(含参考答案)

A.电磁功率增加,功率角下降; B.电磁功率下降,功率角增加;
C.电磁功率不变,功率角下降; D.电磁功率增加,功率角增加。
4.当同步发电机采用自整步法与电网并联时,除发电机端电压仅小于电
C.发电机原来的运行状态为欠励,功率角增大;
D.发电机原来的运行状态为欠励,功率角减小。
9.三相同步发电机稳定运行,外接纯电阻负载,则该发电机的电枢反应性
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重庆大学
《同步电机》试卷
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四、计算题(共 30 分)
1.一台隐极同步发动机,X*s=1,R*a=0,接在 U*N=1 的电网上,运行 工况为 I*N=1、cosφN=0.8(滞后)。试求额定情况下:(1)内功率因数角ψ0N(3 分);(2)功率角δN(3 分);(3)激磁电动势 E*0N(3 分);(4)电磁功率 P*eN(3 分);(5)最大电磁功率 P*eN(max)(3 分);(6)过载能力 kp(3 分)。当电网电压下 降为 U*=0.7 时,为了维持有功功率不变,并使功率角保持在不大于 30°的 范围内,试求:(7)激磁电动势 E*0(4 分);(8)电枢电流 I*(4 分);(9)功率因数 cosφ(4 分)。
教 务
质为 B 。
处
A.交轴电枢反应;
B.直轴去磁与交轴电枢反应;
制
C.直轴增磁电枢反应;
D.直轴增磁与交轴电枢反应。
10.同步电抗表征同步电机三相对称稳定运行时 B 。
A.气隙合成磁场的一个综合参数;
B.电枢反应磁场和电枢漏磁场的一个综合参数;
计算机网络第一、二章课堂测验题及答案

第一、二章测验答案一、填空题(每空 1 分,共 25 分)1.计算机网络是现代[ 通信 ] 技术和现代[ 计算机 ] 技术密切结合的产物。
2.在ISO OSI/RM 中,同层对等实体间进行信息交换时必须遵循的规则称为[ 协议 ] ,相邻层间进行信息交换时必须遵循的规则称为[ 服务 ] 。
3.在物理层,数据传输的基本单位是[ 比特 ] 。
在数据链路层,数据传输的基本单位是 [ 帧] 。
在网络层,数据传输的基本单位是 [ 分组或包、IP 数据报或数据报 ] 。
在传输层,数据传输的基本单位是 [ 数据报‘报文段使用TCP时、用户数据报使用UDP时’] 。
4.从通信的双方信息交互的方式来看,可以有 [ 半双工 ] ,[ 全双工 ] ,[ 单工 ] 三种基本方式。
5.面向连接服务具有 [ 呼叫建立或连接建立 ] 、 [ 数据传输 ] 和[ 呼叫清除或连接释放 ] 三个阶段。
6.在计算机网络中, [ 层次结构模型 ] 和[ 各层协议 ] 的集合称为网络体系结构。
7.多路复用技术可以分为 [ FDM ] 、波分多路复用、 [ TDM ] 三种基本方式。
8.带宽原指信号具有的频带宽度,现在人们习惯把其等价于 [ 数据率 ] ,也称为吞吐量。
9.数据交换技术有三种:[电路交换]、报文交换和[分组交换]。
10.[ 数据 ] 是运送消息的实体, [ 信号 ] 是数据的电气或者电磁的表现。
11.将一种数据形式转换成适合于在信道上传输的某种电信号形式,这类技术统称为 [ 调制 ] 。
12. 在脉冲编码调制( PCM)的过程中分为三种 [抽样]、量化、编码。
二、选择题(每小题 2 分,共 30 分)1.将数字数据进行模拟传输所需要的关键设备是( B )。
A.编码译码器 B .调制解调器 C.信号放大器 D .信号中继器2.按频率分割信道的方法叫(A)。
A.FDM B. TDM C.WDM D.STDM3.计算机网络最突出的优点是(D)。
(2021年整理)分析化学课堂上练习题答案1

(完整)分析化学课堂上练习题答案1编辑整理:尊敬的读者朋友们:这里是精品文档编辑中心,本文档内容是由我和我的同事精心编辑整理后发布的,发布之前我们对文中内容进行仔细校对,但是难免会有疏漏的地方,但是任然希望((完整)分析化学课堂上练习题答案1)的内容能够给您的工作和学习带来便利。
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第十六章色谱概论一、选择题1.在色谱过程中,从总体上看,组分在流动相中停留的时间为:()。
A. t0 B。
t R C. t′R D。
k2.衡量色谱柱的柱效应使用( )。
A 保留值 B。
分离度 C.板高 D。
峰面积3.衡量色谱柱效能的参数为()。
A. 分离度B. 容量因子C. 塔板数D。
分配系数4.下列哪种色谱方法的流动相,对色谱选择性无影响?( ).A.液-固吸附色谱 B.液—液分配色谱 C.空间排阻色谱 D.离子交换色谱5.在气-液色谱中,为了改变色谱柱的选择性,主要可进行如下哪种(些)操作?( )。
A.改变固定相的种类B.改变载气的种类和流速C.改变色谱柱的柱温D.(A)和(C)1. A;2. C ;3.C ;4.C ;5.D二、判断题1.色谱柱越长,单位长度所包含的理论塔板数(片/米)就越多。
()2.在其他实验条件相同的情况下,色谱柱越长,色谱峰越宽。
( )3.从总体上看,各种组分在流动相中停留的时间都等于死时间。
( )4.组分被载气完全带出色谱柱所消耗的载气体积为保留体积。
()5.某一组分的分配比 k=1/3,表明该组分的移动速度是流动相速度的 3倍。
( )1.×;2.√;3.√;4.×;5.×第十七章气相色谱法一、选择题1.在气相色谱法中其他条件均不改变,柱长增加一倍则将发生().A.物质对的分离度增大,但半峰宽不变 B.理论塔板高度增加C.分离度和半峰宽都增大至倍 D.每米所含塔板数增大2.在GC法中对某一组分来说,一定的柱长下,与组分的保留时间无关的是()A.保留比B.分配系数 C.扩散速度 D.分配比3.在一根 1 米长的柱上测得两组峰的分离度为 0。
国开(河北)51777《领导科学与艺术》课堂测验1复习资料答案

领导科学与艺术-课堂测验1 作业资料答案
说明:每学期的课程题目都可能更换,请认真核对是您需要的题目后再下载!
【题目】
19世纪末到20世纪40年代,这个时期被称为行为研究时期,侧重研究领导者所具备的素质修养。
对
错
正确的答案是“错”。
【题目】
20世纪40年代到70年代早期,这个时期被称为行为研究时期,侧重研究领导风格。
对
错
正确的答案是“对”。
【题目】
21世纪的领导理论虽然有了新的发展,但是基本还是延续以往的理论基础提出的。
对
错
正确的答案是“错”。
【题目】
curphy-roellig模型认为,追随者的类型是静态的、一成不变的,基本上可以被划分为四类。
对
错
正确的答案是“错”。
【题目】
erg理论认为,各个层次的需求得到的满足越少,则满足这种需求的渴望越大。
对
错
正确的答案是“对”。
【题目】
lmx理论认为,圈内的成员与领导者有着更密切的关系,并且圈内的下属做事更加积极。
对
错
正确的答案是“对”。
【题目】
x理论的指导下,领导者会采用严格的管理方式。
对。
广州大学心理统计课堂练习题与答案考试要点攻略

⼴州⼤学⼼理统计课堂练习题与答案考试要点攻略集中量数⼀、判断题1、6,5,8,4,7的平均数是5。
(╳)2、6,5,8,4,7的中数是5。
(╳)3、⼀个次数分布的所有观测值的离均差之和为零。
(√)4、中数是我们最常⽤的集中量数。
(╳)算术平均数5、如果⼏个数的权重⼀样,我们可以直接⽤算术平均数来计算加权平均数。
(╳)⼆、选择题:1、⼀个变量的平均数是40,中数是38,众数是36。
如果该变量的每⼀个观测值都加上12,则新的中数为:CA 、40;B 、42;C 、50;D 、52;E 、条件不⾜⽆法计算 2、上题中新的平均数是: DA 、40;B 、42;C 、50;D 、52;E 、条件不⾜⽆法计算 3、如果上题中每个观测值都减去10,则新的平均数为:AA 、30;B 、40;C 、50;D 、条件不⾜⽆法计算4、ΣX= BA 、N X / ;B 、N X ? ;C 、X N X -∑ ;D 、2N;E 、05、有偶数个数据按⼤⼩顺序排列,则其中数为: CA 、出现次数最多的那个数B 、位于中间位置的那个数C 、中间两个数的算术平均数D 、最⼤和最⼩数的平均数E 、没有具体的数字⽆法计算6、有奇数个数据按⼤⼩顺序排列,则其中数为:BA 、出现次数最多的那个数B 、位于中间位置的那个数C 、中间两个数的算术平均数D 、最⼤和最⼩数的平均数E 、没有具体的数字⽆法计算7、某次考试,⼀个班20⼈,平均成绩为70;另外⼀个班30⼈,平均成绩为80;这50个⼈的平均成绩为:DA 、70;B 、74;C 、75;D 、76;E 、808、已知全班70⼈的平均成绩为75,其中30名⼥⽣的平均成绩为79,则40名男⽣的平均成绩是多少?CA 、70;B 、71;C 、72;D 、75;E 、79 三、计算题:1、某校连续5年招⽣⼈数为1000,2200,3600,5000,6200,试求该校招⽣⼈数的平均增长率。
2、试将下列数据编制成次数分布表,并根据次数分布表计算其平均数、中数、理论众数,找出粗略众数并⽐较之。
青骄第二课堂2021期末考试题及答案(初三)

青骄第二课堂2021期末考试题及答案(初三)青骄第二课堂2021期末考试题及答案(初三)常见毒品的识别1、常见的传统毒品有海洛因、鸦片、大麻、可卡因()。
A、摇头丸B、三唑仑C、吗啡D、冰毒正确答案:C2、可卡因的颜色通常是()。
A、白色粉末B、黑色粉末C、黄色粉末D、红色粉末正确答案:A3、冰毒的主要化学成分为()。
A、甲基苯丙胺B、甲基丙二酸C、麻古D、海洛因正确答案:A4、"麻古'是泰语的音译,其主要成分是()。
A、甲基苯丙胺B、二乙酰吗啡C、大麻D、鸦片正确答案:A5、摇头丸服用后表现为()。
A、自我约束能力提高B、运动过度和出现幻觉C、精神依赖性弱D、引发感染并发症正确答案:B毒品对身体的危害1、下列属于良好的生活习惯表现的是()。
A、不吸烟、不喝酒、慎重交友B、不涉足青少年中学生不宜进入的场所C、乐于尝试新鲜事物,不管好坏都要试一试D、面度困难时,自暴自弃,一蹶不振正确答案:A、B2、合成毒品直接作用于人的()。
A、大脑B、心脏C、中枢神经D、胃正确答案:C3、构筑拒毒心理防线一定要从以下方面着手()。
A、知道什么是毒品B、知道毒品的危害C、知道毒品极易成瘾,难以戒除D、知道毒品违法犯罪要受到法律制裁正确答案:A、B、C、D4、学生吸毒,会有什么症状()A、逃学,学习成绩下降B、身体免疫力下降C、到处借钱,肆意挥霍D、变得自私和懒散正确答案:A、B、C、D5、艾滋病,全称是"获得性免疫缺陷综合征',是一种由于机体感染了人类免疫缺陷病毒而发生的传染病,它的英文简称是()。
A、HIDSB、IADSC、DHIOSD、AIDS正确答案:D打赢禁毒战争捍卫美好生活1、购买吸食毒品可能对禁毒工作造成什么危害A、为毒贩提供资金,使他们能够扩张规模、配备武器B、让禁毒工作变得更加复杂、困难C、促进经济发展D、加快、加深毒情蔓延、危害社会安定正确答案:A、B、D2、有些缉毒警察牺牲后无法获得公开的表彰,主要是因为A、缉毒工作的重要性不够B、防止毒贩打击报复,保护烈士家人的安全C、缉毒警察理所应当是无名英雄D、缉毒工作布局复杂,有些案件不能留给毒贩线索正确答案:B、D毒品危害地球安全,禁毒侠重拳出击1、毒品可能对社会造成哪些影响A、没有明显影响,可以自由流通B、吸毒诱发犯罪,影响社会安定C、摧残民众体智,阻碍民族复兴D、创造社会财富,形成良性循环正确答案:B、C2、我国禁毒工作包括A、开展全民禁毒宣传教育,让"远离毒品,拒绝毒品'的意识成为全社会高度共识B、采取各种措施帮助吸毒者戒毒,使其回归健康生活C、打击毒品吸食、走私、运输、制造、贩卖等违法犯罪行为D、开展禁毒国际合作,依法履行国际禁毒公约义务正确答案:A、B、C、D打着潮流旗号的"伪装者'1、除潮流饮品外,新类型毒品还有哪些伪装形式?A、邮票、贴纸等形式B、奶茶粉、咖啡粉等冲剂C、跳跳糖、巧克力等零食包装D、茶杯正确答案:A、B、C2、现实生活中,我们要如何防范新类型毒品所伸出的魔爪?A、尽量少出入KTV、酒吧、夜总会等治安较为复杂的地方B、要有警戒意识,不随意接受陌生人的食物或饮料C、从正规渠道购买售价在正常范围内的食品D、从网络上搜集了解更多新类型毒品小知识,防范于未然正确答案:A、B、C、D期末考试1.吸毒成瘾三个身体特征是药物耐受性、生理依赖性和(B)A.躯体依赖性B.生理依赖性C.敏感性2.曲马多主要用作镇痛药,大剂量服用可在短期内上瘾,而他的危害主要表现为(D)A.全身关机疼痛B.焦虑不安、伴随记忆力下降C.食欲下降、体重减轻D.以上A、B、C三项均表述正确3."不良家庭环境对青少年沾染毒品有很大影响,在吸毒人员中,很多家庭存在较多的问题'。
2021专升本《大学英语》课堂测验及答案

2021专升本《大学英语》课堂测验及答案专升本《大学英语》课堂测验点击解压-专升本《大学英语》课堂测验答案.zipPART I Vocabulary and Structure (45%)Directions: There are 30 incomplete sentences in this part. For eachsentence, there are four choices marked A, B, C and D. Choose the 0NE answerthat best completes the sentence.1. Everyone thought Henry would _____ the company after his father died.A. come overB. take overC. go overD. think over 2. Hewould sack any of his staff who _____ his high standards.A. failed short ofB. failed out ofC. fell short ofD. fellout of 3. Mary _____ her three children all her herself.A. brought inB. brought upC. took inD. took up 4. Christianity, Islam and Buddhism are the great ______ of the world. A.regions B. legends C. religions D. learners 5. Leftall alone in her room, she was ______.A. in despairB. in orderC. in actionD. in luck 6.It is surprising that the children ______ computer games.A. do well forB. do well byC. do well inD. do well on7. A committee will be selected to ______the new leader.A. choseB. choiceC. chosenD. choose 8.Maggie was so sad that her beloved father ______.A. passed outB. passed awayC. passed byD. passed up 9.Two workers agreed to speak to us ______ they not be named. A. on nocondition that B. in condition that C. on condition that D. in on condition that 10. His words are strongly _____ on my memory.A. printedB. impressedC. memorizedD. remembered 11. Brown was ____ to find his article on such a ____ topic so ____. A. astonishing, exciting, boring B. astonished, excited, bored C. astonished, exciting, boring D. astonishing, excited, bored 12.We?ve finally fixed _____ a place to have the concert. A. in B.at C. on D. with 13. Thankfully she did not persist______ pursuing her mad ideas. A. in B. at C. onD. with14. Parents are likely to impose their own moral values _____ their children. A. in B. at C. on D. with15. To change ______ to employing women, the government is bringing innew laws. A. attitude B. altitude C. attitribute D. aptitude16. Their neighbors ______ about their constant loud music.《大学英语》课堂测验第1页(共7页)页A. angryB. agreeC. complainD. comply 17. If you driveyour car like that, you?ll ______ in hospital. A. end to B. end byC. end offD. end up18. Paul is a hard working student. He ______ two essays every week.A. turn atB. turn upC. turn offD. turn in19. The play is mainly directed for young people. That?s why the audience_____ young people.A. consist inB. is consisted inC. consists ofD. is consistedof 20. It is not realistic to ______ smoking in order to save money now.A. give inB. give forC. give backD. give up 21.The boy went out______ his father?s orders.A. despite ofB. despite onC. in spite ofD. in spiteon 22. The ______ of the children into groups was according to age.A. teamB. troopC. divisionD. group 23. Of course she behaves awfully, but______, she is your sister.A. in allB. after allC. above allD. at all24. Tom kept his promise _____ he would always do anything he could for Lucie to make sure of her happiness.A. whatB. thatC. whichD. / 25. Is this museum _____ the exhibition was held?A. whereB. thatC. on whichD. the one 26. The college won?t take anyone _____ eyesight is weak.A. whoB. whoseC. of whomD. which27. This is the last factory ___ he used to work at, many workers of _____ still have a good relationship with him.A. that; itB. which; whomC. that; whichD. which; that 28. His walking stick, ____ he can?t walk, was lost yesterday.A. thatB. with whichC. whichD. without which 29. He told me the reason _____ he didn?t come here.A. whichB. thatC. whyD. what30. There are three libraries in our school, _______ were built five years ago. A. all of them B. either of them C. all of which D. both of thatPART II Reading Comprehension (45%)Directions: In this part, there are four passages. Each passage is followed by some questions and unfinished statements. For each of them there are four choices marked A, B, C and D. Choose the best one. (The underlined sentences are to be translated.)Passage one1 It is believed that only 1 percent of the world?s population refuses to eat all types of meat and only one-tenth of the 1 percent are total vegans, avoiding all animal products. Yet many cultures restrictwhat meats may be eaten, mostly according to religious laws. The loyalty to each religion sees little reason to ask why a meat is prohibited. In fact, it is considered rude for humans to question the directives of God《大学英语》课堂测验第2页(共7页)页or church..\2 Some researchers have studied how animals are classified as “different” or “unnatural” due to their physical characteristics. The Jewish prohibition against pork, for example, seems to be because pigs do not chew their cud. While others have focused on the use of the term unclean in relation to pork prohibitions, claiming that pork eating is unhealthful.3 Marvin Harris has proposed a theory for why certain meats are avoided. He suggests that if an animal is much more valuable alive than dead, consumption will be prohibited. He reviews the examples of beef in India, pork in the Middle East, and horsemeat in Europe of the Middle Ages.4 In India, 80 percent of the population lives in rural areas, where cattle are the primary power source. In addition, cattle provide dung that is dried to produce a clean, slow-burning cooking fuel. Cows also provide milk for the dairy products. Even dead cows serve a purpose in India, providing the very poor with the skins to make leather products to survive financially.5 Records show that pork was a part of the foods in the ancient Middle East. However, by about 1900 B.C.E., pigs had become unpopular sources of meat. This occurs with the growth of the population in the region. Though pigs are efficient producers of meat, they compete with humans for food resources. In addition, they do not live healthy in hot, dry climates. Cows, goats, and sheep, on the other hand, are grass-eating animals that chew their cud a second time. They live on the plants unavailable to humandigestion. There was a broad dislike to pigs by many Middle Easterners, which perhaps explains why the only clearly prohibited animal meat in Islam is pork.6 Eating of horsemeat was prohibited by Christianity at one time. Horse consumption was frequent in the prehistoric Europe but diminished as the region became more forested. Though an uncommon meat, it was still enjoyed when available. Prohibitions against eating horse began with the use of horse by the soldiers to fight on horseback. During the 8th century, when European Christian strongholds came under attack from Moslem soldiers on horseback, Gregory III recognized the need for the horses in the defense of the church. He prohibited consumption of horsemeat as “unclean”. However, horse consumption never disappeared entirely, especially during periods when other meats were limited. And gradually, religious restrictions were eased. By the 19th century, horsemeat had regained favor, especially in France and Belgium, where it is a fine dish today. Despite the early need for horsepower, the prohibition was not continuous over time because it was against common food traditions.1. Marvin Harris?s theory about the prohibitions of meat is that _____.A. if the animal is grass-eating, eating will be prohibited.B. if the meat of an animal is more expensive, eating will be avoided.C. if the animal is more useful, eating will be prohibited.D. if the animal is not clean, eating will be unhealthy.2. The following reasons explain why cows are treated to be sacred in India EXCEPT______.《大学英语》课堂测验第3页(共7页)页A. they are unhealthy.B. they are the basic power source.C. the dried dung can produce cooking coal.D. they can produce milkfor diary products.3. All of the following EXCEPT______ are the reasons why pigs were disliked by the Middle Easterners.A. They are efficient meat producers.B. They eat the same food as people.C. They can?t bear the climate there.D. They don?t chew their cud.4. What made Gregory III declare the horsemeat prohibition? A. The horses were needed for protecting the church. B. The eating horsemeat was not clean C. Horsemeat was still liked by people.D. The horsemeat prohibition was against common food traditions. 5. From the passage, it can be inferred that_____________. A. there is only one theory about the meat prohibition B. some people avoid meatC. with time going by, meat prohibitions have been changing.D. thereis no reason to prohibit meat eatingPassage Two1 Some people are just doomed to be failures. That's the way some adults look at troubled kids. Maybe you've heard the saying, \bird with a broken wing will never fly as high.\Ware was made to feel this way almost every day in school. By high school, Ware was the most well-known troublemakerin his town. Teachers would complain when they saw his name posted on their classroom lists for the next semester. He wasn't very talkative, didn't answer questions and got into lots of fights. He had flunked almost every class by the time he entered his senior year, yet was being passed on each year to a higher grade level. Teachers didn't want to have him again the following year. Ware was moving on, but definitely not moving up.2 Ware was one of 405 students who signed up for ACE training, a program designed to have students become more involved in their communities. At the start of the training, Ware was standing outside the circle of students, against the back wall, with that \ahead, impressme\look on his face. He didn't readily join the discussion groups. But slowly, the interactive games drew him in. The ice really melted when the groups started building a list of positive and negative things that had occurred at school that year. Ware had some definite thoughts on those situations. The other students in Ware's group welcomed his comments. The next day, WARE was very active in all the sessions. By the end of the training, he had joined the Homeless Project team. He knew something about poverty, hunger and hopelessness. The other students on the team were impressed with his passionate concern and ideas. They elected Ware chairman of the team. The student council president would be taking his instruction from Ware.《大学英语》课堂测验第4页(共7页)页3 When Ware showed up at school on Monday morning, he arrived to a firestorm. A group of teachers were protesting to the school principal about his being elected chairman. The very first communitywide service project was to be a food drive. These teachers couldn't believe that the principal would allow this crucial beginning to a three-year action plan to stay in the incapable hands of Ware. They reminded the principal, \has an arrest record as long as your arm. He'll probably steal half the food.\Mr. Coggeshall reminded them that the purpose of the program was to uncover any positive passion that a student had and strengthen its practice until true change can take place.4 Two weeks later, Ware and his friends led a group of 70 students ina drive to collect food. They collected a school record 2,854 cans of food in just two hours. The local newspaper covered the event with a full-page article the next day. That newspaper story was posted on the main bulletin board at school, where everyone could see it. Ware's picture was up there for doing something great, for leading a record-setting food drive. Everyday he was reminded about what he did. He was being acknowledged as leadership material. Ware started showing up at school every day and answered questions from teachers for the first time. Ware reminds us that a bird with a broken wing only needs mending. But once it has healed, it can fly higher than the rest.6. The teachers feel _____ when seeing Ware?s name on the classroom list for the next term?A. happyB. shockedC. uncomfortableD. excited7. The phrase \ahead, impress me\means Ware has a(n) _____ attitude to the training.A. surprisedB. indifferentC. activeD. eager 8. Why was Ware elected chairman of the team?A. Ware?s passionate concern and ideas impress other students.B. He knew something about poverty, hunger and hopelessness.C. Ware had some definite thoughts on those situationsD. The other students are not willing to be elected. 9. In paragraph 3, “firestorm” refers to _____.A. a fire of great sizeB. criticism from the teachersC. praise from the principalD. support from the students10. Ware was being acknowledged as leadership material mainly because _____ A. the success of leading a food drive. B. Ware was elected chairman of the team. C. Ware answered questions from teachers. D. The local newspaper reported the event.Passage Three1. They are the generation of women in Great Britain who grew up expecting to have it all. No longer forced to choose between children and career, they were set to《大学英语》课堂测验第5页(共7页)页。
(完整版)重庆大学直流电机课堂测验(含参考答案)

重庆大学 电机学(1) 课堂测验二2011 ~2012 学年 第 一 学期考试方式:闭卷测验日期:2011.12.08测验时间: 45 分钟题 号一二三四五六七八九十总 分得 分一、单项选择题(每小题2分,共20分)1.一台额定转速为1000r/min 的并励直流电动机,在额定状态运行时输入功率为10kW ,若在电枢回路中串电阻调速,保持负载转矩不变,当转速为800 r/min 时输入功率为 A 。
A .10kW ; B .8kW ;C .12.5kW ; D .无法确定。
2.直流电机交轴电枢反应磁动势最大值的位置取决于 D 。
A .电刷的位置; B .主磁极轴线的位置;C .转子旋转方向; D .电枢的几何中性线。
3.把直流发电机的转速升高20%,他励方式运行空载电压为U 他,并励方式空载电压为U 并,则 B 。
A .U 他=U 并;B .U 他<U 并;C .U 他>U 并。
4.一直流电动机拖动一台他励直流发电机。
当电动机的外电压、励磁电流不变时,增加发电机的负载,则电动机的电枢电流I a 和转速n 将 A 。
A .I a 增大,n 降低; B .I a 减少,n 升高;C .I a 减少,n 降低; D .I a 增大,n 升高。
5.在直流电机中,公式E a =C e Фn 和T =C T ФI a 中的Φ指的是 C 。
A .每极合成磁通; B .所有磁极的总磁通;C .主磁通每极磁通; D .以上都不是。
6.直流电动机起动时,励磁回路应 B 电源。
A .与电枢回路同时接入;B .比电枢回路先接入;C .比电枢回路后接入。
7.直流电机电枢绕组元件中的电动势和电流是B。
A .直流;B .交流;C .可能是直流也可能是交流。
8.直流电动机的额定功率指 B 。
A .转轴上吸收的机械功率;B .转轴上输出的机械功率;C .电枢端口吸收的电功率;D .电枢端口输出的电功率。
9.电枢磁动势与主磁场相互作用产生电磁转矩。
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2013-2014 学年第二学期《工程光学》随堂测试(I)2013-2014 学年第二学期《工程光学》随堂测试(II)班级学号姓名成绩2014 年3 月7 日班级学号姓名2014 年3 月11 日成绩一、填空题(本题共6 分,第2 小题每空0.5 分,其余每空1 分)1、可见光的波长范围380nm~760nm 。
2、几何光学的四大基本定律分别是光的直线转播定律,光的独立传播定律,光的折射定律,光的反射定律。
一、填空题(本题共6 分,每空2 分)1、光学系统成完善像应满足的条件为:①入射波面为球面波,出射波面也为球面波。
②入射光为同心光束,出射光也为同心光束。
③物点和像点之间任意两条光路的光程相等。
2、在近轴区内,表征单个折射球面的物、像位置关系公式可以简化为n '-n=n '- n的形式,阿贝不变量Q 的等式为Q = n '(1-1) = n(1-1) (已知3、全反射的基本条件光线从光密介质向光疏介质入射,入射角大于临l ' l r r l ' r l界角。
4、已知光在真空中的光速c≈3×108m/s 则光在水(n=1.333)中的光速为c= 2.25 ⨯108 m / s 。
n 物方折射率为n,像方折射率为n',球的半径为r,物方截距为l,像方截距为l')。
二、画图题(本题共4 分)。
试利用符号规则标出下面光组及光线的实际位置二、简答题(本题共4 分,每题2 分)。
1、简述光路可逆性原理Page 42、简述费马原理Page5r =-40 mm,L'= 200mm, U'= -10°。
-U ' = 1 0OL' = 2 0 0m m班 级 学 号 姓 名 2014 年 3 月 18 日成 绩班 级学 号姓 名2014 年 3 月 25 日成 绩一、 填空题(本题共 6 分,每空 1.5 分)1、若垂轴放大率 β>0,即 y '与 y 同号,表示成正像(正像,倒像);反之 y '与 y 异号,表示成倒像(正像,倒像)。
2、折射球面的轴向放大率恒为 正 (正,负)。
3、垂轴放大率、轴向放大率与角放大率三者之间的关系式αγ = β 。
二、画图题(本题共 4 分,每题 2 分)1、试画出物 AB 经过凹面镜所成的像 A 'B '(实像)(书上 page12)一、填空题(本题共 4.5 分,每空 0.5 分)1、在 任意大 的空间,以 任意宽 的光束均能成 完善像(完善像,非完善像)的光学系统,叫理想光学系统。
2、一个光学系统的像方焦点和物方焦点是 不共轭 的(共轭,不共轭)。
3、①倾斜于光轴入射的平行光束,经过系统后出射光束交 像方焦平面上的一点;②自物方焦平面 上一点发出的光束,经系统后成倾斜于光轴的平行光束出射。
③共轭光线在一对主面上的 投影高度 相等,即垂轴放大率等于 1 。
4、角放大率γ=+1 的一对共轭点称为节点。
二、作图题(本题共 5.5 分)假定两个已知光学系统的焦距分别为 f , f ' 和 f , f ' ,如图所示,请通过作图根据1 12 2符号规则标出该组合系统的①物方焦点( F )和像方焦点( F ' )②物方焦距( f ) 和像方焦距( f ' )。
③物方主平面和像方主平面(书 page29)2F =班 级学 号 姓 名成 绩班 级 学 号 姓 名成 绩2014 年 4 月 1 日2014 年 4 月 4 日二、 填空题(本题共 6 分,每空 1 分)1、解析法求像中,以光学系统 焦点 为原点的物象位置关系,称为牛顿公式,相应公式为 xx ' = ff ' ;以光学系统 主点 为原点的物象位置关系,称为高斯公三、 填空题(本题共 4.5 分,每空 0.5 分)1、一个位于空气中焦距等于 25cm 的光学系统,其光焦度为4 折光度 ;(光焦度的单位为折光度记为 D ,是 m 的倒数关系)式,相应公式为 f ' + f= 1;2、直径为 100mm 的球形透镜,f ' = 75mm ,l ' = 25mm , 其像方主面位于球心处,l l2、理想光学系统两焦距,物方焦距和像方焦距同介质折射率之间的关系表达式为f 'n '物方主面位于球心处;(这题描述清楚些都可以)3、 f ' = 100mm , 折射率为 1.5 的玻璃薄透镜位于空气中时,设其两面曲率相等,则半径r = 100mm ,r = -100mm 。
f ' = 100mm , 的空气薄透镜位于折射率为 1.5 =- 。
若光学系统中包括反射面,则两焦距之间的关系由反射面个数决定,设 1 2f n的玻璃中时,设其两面曲率相等,则半径 r = 66.67mm , r = -66.67mm 。
(所 反射面个数为 k ,则物方焦距和像方焦距同介质折射率之间的关系表达式为f '= (-1)k +1n ' 。
fn二、计算题(本题共 4 分)已知: f ' > 0 , f ' = - f ,l = 2 f ' , y ,求: l ', β12有的题别忘记单位)4、平行光管是一种产生 平行 光的装置,被照明目标需位于平行光管物镜的物方焦平面处。
(焦平面一定说明白是哪个)二、计算题(本题共 5.5 分)已知:焦距 ''f 1 = -100mm ; f 2 = 100mm 的两个薄透镜组成一个光组,透镜间隔:1 1 12 f 'l ' 2 f '3 1d = 100mm ,求合成光组的焦距和光焦度,并用作图法确定物方和像方主面H , H ' 的位由 - = 得: l ' = 则β = = = 置l ' l f ' 3 l 2 f ' 3由组合系统焦距公式可得:1 1 1 d 1 1 100 1+ - = + - = f ' f ' f ' f ' f '-100 100 -100 ⨯100 100 1 2 1 2x 得 f ' = 100mm 2013-2014 学年 第二学期《工程光学》随堂测试(VIII )光焦度为:班 级学 号姓 名成 绩Φ = 1f ' = 1 0.1m= 10D2014 年 4 月 8 日首先注意这题目说的是薄透镜,有的同学没有近似表示 作图法求系统主面如下图所示,1四、 填空题(本题共 6 分,每空 1 分)1、平面镜成像特性:平面镜成 完善 像(完善,非完善),正立的像与物等距离分布在镜面两边,大小 相同,虚实 相反 。
1F 1'22HH' F 2F 1F 2'F'f’2、入射光线方向不变,单块平面镜绕垂直于入射面的轴旋转 α 时,反射光线将旋转2α 角,当夹角θ 的双平面镜整体转动 α 角时,出射光线方向 不变。
3、光线经过夹角为 22.5o 的双平面镜 2 次反射后,出射光线相对入射光线偏转45o 。
二、画图题(本题共 4 分)试判断下图各棱镜或棱镜系统转向情况。
设输入为右手坐标系,画出相应的输出坐 标系。
y z xy zxy Pz 物镜x y z y z zxyxz 目镜 xym班 级学 号 姓 名 2014 年 4 月 15 日成 绩班 级学 号姓 名2014 年 4 月 18 日成 绩五、 填空题(本题共 4 分,每空 1 分)1、通过厚度为 d ,折射率为 n 的平行平板观察物体与直接观察物体相比,看到的物六、 填空题(本题共 4 分,每空 1 分)1 α1、写出折射棱镜最小偏向角的表达式 sin (α + δm ) = n s in。
体大小相等 ,位置向 人眼 方向移动 (1 - 1)d 。
n2 22、当光线垂直入射到折射率 n 为 1.5,折射角 α 为 10o光楔时,出射光线的偏向角 δ2、折射棱镜折射角 α = 60o ,c 光的最小偏向角 δ = 42o 15' ,试求棱镜光学材料的折射率为1.557 。
二、简答题(本题共 6 分)在 β = -2 倍成像系统的物方和像方光路中分别加进 n = 1.5,d = 15mm 的平行平板,引 起的像面位移情况是否相同? 位移量各为多大? (1)平行平板放在物方时:为 5o。
3、折射棱镜可作为分光元件,当白光通过折射棱镜后, 红 色光偏向角最小(红,紫); 紫 色光偏向角最大。
二、计算题(本题共 6 分)有一等边折射棱镜,其折射率为 1.52,求光线经过棱镜的两个折射面折射后产生最 小偏向角时的最小偏向角和入射角。
1 1 ∆l ' 1 α位移量 ∆l = d (1- ) = 15(1- n 1.5 ) = 5mm ,又由α = -β 2,α =得: ∆l 由 sin (α + δm 2) = n s in 2 ,且α = 600 ,n = 1.52∆l ' = 10mm(2) 平行平板放在像方时:得:δ = 38.93oα + δ = I 1 - I 2 'I = α + δ = o位移量 ∆l ' = d (1 - 1 ) = 15(1 - 1) = 5mm由I = -I ' ,得: 149.47 21 2n 1.5所以,平行平板放在物方和像方引起的像面位移情况不同班级学号姓名2014 年4 月29 日成绩班级学号姓名2014 年5 月13 日成绩七、填空题(本题共4 分,每空1 分)1、限制轴上物点成像光束宽度的光阑是孔径光阑,而渐晕光阑在其基础上进一步限制轴外物点的成像光束宽度。
2、测量显微镜的孔径光阑放置在显微物镜的像方焦面处,视场光阑放置在一次实像面处。
二、计算题(本题共6 分)将一个焦距为40mm,直径为30mm 的薄透镜做成放大镜,眼瞳放在透镜像方焦点上,眼瞳直径为4mm,物面放在透镜物方焦点上,试问:(1)哪个是孔径光阑,哪个是视场光阑;(2)入瞳在哪里?物方半孔径角等于多少?(3)入射窗在哪里?(1)眼瞳是孔径光阑,透镜框是视场光阑;(2)入瞳在物方无限远处,物方半孔径角:2.86o;(3)透镜是入射窗八、填空题(本题共5 分,每空1 分)1、为减小测量误差,测量仪器一般采用物方远心光路,请选择该光路具有的哪些属性(多选)②③(①物方主光线通过物方焦点。
②像方主光线经像方焦点。
③物方主光线平行于光轴。
④像方主光线平行于光轴。
)2、能在像平面上获得清晰像的沿光轴方向的物空间深度称为景深。
3、照相物镜的相对孔径的表达式为D / f ' ,相对孔径越大,景深越小。