中级维修电工理论复习试题.doc
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position-related consumption of civil servants has been swept by finance, consumer, regardless of cost, extravagance and waste in the civil service position-related consumption, abuse, corruption and embezzlement, corruption is important. Then, under the conditions of market economy, how to reform the existing civil duty consumption management, explores a source to prevent and curb the post consumption corruption way, is currently a major issue faced by honest work. Recently, I conducted research on this issue, this problem on some humble opinions. First, the existing public servants duty consumption the main problems seen from the investigation and reasons, in recent years, public servants duty consumption caused by the abuses and not a person of integrity, is one of the major problems in the party in Government, its operation order have a negative effect on the party and Government organs, seriously damaging the image of the party and the Government, undermining the relationship between party and the masses, effect, opening up and economic construction. From I County in recent years of governance situation see, positions consumption in the produced of two not phenomenon rendering four a features: a is positions consumption system lost has due of binding, right is greater than rules, and right is greater than method of phenomenon more highlight; II is in positions consumption in the Camera Obscura operation, using terms, will positions consumption into has personal consumption, will corporate points to into personal points to, makes positions consumption in some aspects has into positions enjoy and self-dealing of means; three is to positions consumption for name, fraud, false impersonator, Trend of negative corruption phenomena such as corruption and misappropriation; four palaces, follow the fashion, rivalries, wasteful, and post consumption became a symbol of showing off their individual capacities. Caused by public servants duty consumption of many two phenomenon in which people reflect the biggest problems are: (a) the official car problems. Mainly in three aspects: one is the larger buses cost expenditure. According to statistics, until November 2003, XX County township Department bus 159 cars, which department owns the bus 145 vehicles, and showed an increasing trend. Financial expenses cost per bus per year to 35,000 yuan, and in fact every cost up to 50,000 yuan. Some units also hiring temporary drivers and expenditure on wages and subsidies. Necessary to keep a car, but also dependants, leading to larger expenses. Second, gongchesiyong breed unhealthy tendencies. Some people believe that now some bus drivers use one-third, one-third leading private one-third used for official purposes. Some public servants, especially leading officials motoring, cars for private purposes, violating the self-discipline regulations, and even lead to traffic accidents. According to statistics from related departments, since 2004, the correct investigation in our County serves nearly 30 cars for private purposes, only the first half of this year, cars for private purposes or中级维修电工理论复习试题一、选择题(第160题。选择正确的答案,将相应的字母添入题内的括号中。每题1.0分):1在多级放大电路的级间耦合中,低频电压放大电路主要采用( )耦合方式。(A)阻容 (B)直接 (C)变压器 (D)电感2如果一直线电流的方向由北向南,在它的上方放一个可以自由转动的小磁针,则小磁针的N极偏向( )。(A)西方 (B)东方 (C)南方 (D)北方3根据电磁感应定律e= -N(/t)求出的感应电动势,是在t这段时间内的( )(A)平均值 (B)瞬时值 (C)有效值 (D)最大值4在线圈中的电流变化率一定的情况下,自感系数大,说明线圈的( )大。 (A)磁通 (B)磁通的变化 (C)电阻 (D)自感电动势5电感为0.1H的线圈,当其中电流在0.5秒内从10A变化到6A时,线圈上所产生电动势的绝对值为( )(A)4V (B)0.4V (C)0.8V (D)8V6互感器线圈的极性一般根据( )来判定。(A)右手定则 (B)左手定则 (C)楞次定律 (D)同名端7JT-1型晶体管图示仪输出集电极电压的峰值是 ( )伏。(A)100 (B)200 (C)500 (D)10008示波器面板上的“辉度”是调节( )的电位器旋钮。(A)控制栅极负电压 (B)控制栅极正电压 ( C)阴极负电压 (D)阴极正电压9通常在使用SBT-5型同步示波器观察被测信号时,“X轴选择”应置于( )档。(A)1 (B)10 (C)100 (D)扫描10用SR-8型双踪示波器观察频率较低的信号时,“触发方式”开关放在“( )”位置较为有利。(A)高频 (B)自动 (C)常态 (D)随意11一般要求模拟放大电路的输入电阻( ) (A)大些好,输出电阻小些好 (B)小些好,输出电阻大些好 (C)和输出电阻都大些好 (D)和输出电阻都小些好12在正弦波震荡器中,反馈电压与原输入电压之间的相位差是( ) (A)0度 (B)90度 (C)180度 (D)270度13如图所示运算放大器属于( ) (A)加法器 (B)乘法器 (C)微分器 (D)积分器14多谐振荡器是一种产生( )的电路。 (A)正弦波 (B)锯齿波 (C)矩形脉冲 (D)尖顶脉冲15寄存器主要由( )组成 (A)触发器 (B)门电路 (C)多谐振荡器 (D)触发器和门电路16在带平衡电抗器的双反星型可控整流电路中,负载电流是同时由( )绕组承担的。(A)一个晶闸管和一个 (B)两个晶闸管和两个(C)三个晶闸管和三个 (D)四个晶闸管和四个17在晶闸管斩波器中,保持晶闸管触发频率不变,改变晶闸管导通的时间从而改变直流平均电压值的控制方式叫( )(A)定频调宽法 (B)定宽调频法 (C)定频定宽法 (D)调宽调频法18晶闸管逆变器输出交流电的频率由( )来决定的.(A)一组晶闸管的导通时间 (B)两组晶闸管的导通时间(C)一组晶闸管的触发脉冲频率 (D)两组晶闸管的触发脉冲频率19电力场效应管MOSFET适于在( )条件下工作。 (A)直流 (B)低频 (C)中频 (D)高频20电子设备防外界磁场的影响一般采用( )材料作成磁屏蔽罩(A)顺磁 (B)反磁 (C)铁磁 (D)绝缘21小型变压器的绕制时,对铁心绝缘及绕组间的绝缘,按对地电压的( )倍来选用(A)1.5 (B)2 (C)3 (D) 422交流电动机转子绕组修理后,在绑扎前,要绑扎位置上包( )层白纱带,使绑扎的位置平服。(A)1 (B)23 (C)5 (D)5623三相异步电动机温升过高或冒烟,造成故障的可能原因是( )(A)三相异步电动机断相运行 (B)转子不平衡(C)定子、绕组相擦 (D)绕组受潮25变压器的短路实验是在( )的条件下进行(A)低压侧短路 (B)高压侧短路 (C)低压侧开路 (D) 高压侧开路26直流发电机在原动机的拖动下旋转,电枢切割磁力线产生( )(A)正弦交流电 (B)非正弦交流电 (C)直流电 (D)脉动直流电27. 直流电机的换向极绕组必须与电枢绕组( )(A)串联 (B)并联 (C)垂直 (D)磁通方向相反28并励直流电动机的机械特性为硬特性,当电动机负载增大时,其转速( )(A)下降很多 (B)下降很少 (C)不变 (D)略有上升29已知某台电动机电磁功率为9千瓦,转速为n=900转|分,则其电磁转距为( )牛.米 (A)10 (B)30 (C)100 (D)300/30三相异步电动机反接制动时,采用对称制电阻接法,可以在限制制动转距的同时也限制( )(A)制动电流 (B)启动电流 (C)制动电压 (D)启动电压31直流测速发电机按励磁方式有( )种(A)2 (B)3 (C)4 (D)532旋转变压器的定子铁心和转子铁心,采用( )材料冲制、绝缘、叠装而成。 (A)电工用纯铁 (B)高导磁率的硅钢片或铁镍合金片 (C)非磁性合金 (D)软磁铁氧体33反映式步进电动机的转速n与脉冲频率( ) (A)f成正比 (B)f成反比 (C)f2 成正比 (D)f2成反比34直流力矩电动机的工作原理与( )电动机相同 (A)普通的直流伺服 (B)异步 (C)同步 (D)步进35滑差电动机的转差离合器电枢是由( )拖动的(A)测速发电机 (B)工作机械 (C)三相鼠笼式异步电动机 (D)转差离合器的磁极36三相异步换向器电动机调速调到最低转速是,其转动移刷机构将使用同相电刷间的张角变为( )电角度。(A)-180度 (B)180度 (C)0度 (D)90度37变频调速所用的VVVF型变频器,具有( )功能(A)调压 (B)调频 (C)调压与调频 (D)调功率38三相并励换向器电动机调速适用于( )负载(A)恒转距 (B)逐渐增大转距 (C)恒功率 (D)逐渐减小转距39无换相器电动机的逆变电路直流侧( )(A)串有大电容 (B)串有大电感 (C)并有大电容 (D)并有大电感40再实现恒转距调速时,在调频的同时( )(A)不必调整电压 (B)不必调整电流 (C)必须调整电压 (D)必须调整电流41直流电动机用斩波器调速时,可实现( ) (A)有级调速 (B)无级调速 (C)恒定转速42在转速负反馈系统中,若要使开环和闭环系统的理想空载转速相同,则闭环时给定电压要比开环时的给定电压相应的提高( )倍(A)2+K (B)1+K (C)1/(2+K) (D)1/(1+K)43.电压负反馈自动调速系统,调速范围D一般为( ) (A)D10 (C)10D20 (D)20D3044.双闭环调速系统包括电流环和速度环,其中两环之间关系是( )(A) 电流环为内环, 速度环为外环 (B) 电流环为外环,速度环为内环(C) 电流环为内环, 速度环也为内环 (D) 电流环为外环,速度环也为外环45.感应同步器主要技术参数有动态范围.,精度,分辨率,其中动态范围为( )(A)0.240m (B)0.220m (C)0.340m (D)0.320m46.( )属于轮廓控制型数控机床(A)数控机床 ( B)数控钻床 (C)加工中心 (D)数控镗床47. VVVF电梯采用( )方法进行调速(A)改变磁极对数 (B)改变转差率(C)改变电源电压和频率 (D)改变电源电压48.记算机发展的趋势是巨型化,微型化,网络化,智能化,其中巨型化是指( )(A)体积大 (B)质量大 (C)外部设备更多(D) 功能更强,运算速度更快,存储量更大49.微机的核心是( )(A)存储器 (B)总线 (C)CPU (D)I/O接口50.( )不属于微机在工业生产中的应用(A)智能仪表 (B)自动售票 (C)机床的生产控制(D)电机的启动,停止控制51.国内外PLC各生产厂家都把( )作为第一用户编程语言(A)梯形图 (B)指令表 (C)逻辑功能图 (D)C语言52.单相电桥逆变器(电压型)的输出电压为( )(A)正弦波 (B)矩形波 (C)锯齿波 (D)尖顶波53.缩短基本时间的措施有( )(A)提高工艺编制水平 (B)缩短辅助时间(C)减少准备时间 (D)减少休息时间54.缩短辅助时间的措施有( )(A)大量提倡技术改革和技术改造 (B) 减少作业时间(C)减少准备时间 (D)减少休息时间55.在载荷大,定心要求高的场合,宜选用( )连接(A)平键 (B)半圆键 (C)销 (D)花键56.带传动的优点是( )(A)传动比准确 (B)结构紧凑 (C)传动平稳 (D)效率很高57.一对直齿圆锥齿轮的正确 啮合条件是( )(A)m1=m2 (B)a1=a2 (C)m1=m2 a1=a2 (D)m1=m2=m a1=a2=a58.定轴轮系首,末两轮转速之比,等于组成该轮系的( )之比(A) 所有主动轮系数连乘积与所有从动轮齿数连乘积(B) 所有从动轮系数连乘积与所有主动轮齿数连乘积(C) 任意两个主动轮和从动轮(D) 中间惰性齿数59.7000表示( )轴承(A)推离球 (B)圆锥滚子 (C)圆柱滚子 (D)调心滚子60.液压传动中容易控制的是( ) (A)压力方向和流量 (B)泄漏噪声 (C)冲击振动 (D)温度二.判断题(第6180题.将判断结果填入括号中.正确的填,错误的填.每题1.0分.满分20分)( ) 61.磁路和电路一样,也有开路状态( ) 62.用晶体管图示仪观察共发射极放大电路的输入特性时,X轴作用开关应置于基极电压,Y轴作用开关置于基极电流或基极源电压( ) 63.使用示波器时,应将被测信号接入Y轴输入端钮( ) 64.同步示波器一般采用了连续扫描方式( )65.克服零点漂移最有效的措施是采用交流负反馈电路( )66.硅稳压管稳压电路只适应于负载较小的场合,且输出电压不能任意调节( )67.与门的逻辑功能可概括为有0出0,有1出1 ( )68.变压器同心绕组常把低压绕组装在里面,高压绕组装在外面( )69.直流电机的电刷一般用石墨粉压制而成( )70.自整角电机是一种感应式机电元件( )71.无换向整流直流电动机是采用集电环和电刷而不用换向器式的直流电动机( )72.电流截止负反馈环节参与调节作用( )73.磁栅输出信号的大小与磁头和磁性标尺的相对速度无关( )74.SCRD拖动方式直流电梯比FD拖动方式直流电梯节能( )75.在交流电梯进行关门过程中,有人触及安全板时,电梯仍然继续关门( )76.为了保证PLC交流电梯安全运行,安全触点采用常开触点输入到PLC的输入接口( )77.PLC交流电梯自由状态时,按下直流按钮电梯迅速达到所需要层( )78.PLC可编程序控制器是以并行方式进行工作的( )79.平面四杆机构中至少存在一个曲柄( )80.链条的主要参数是节距三. 简答题(8182题.每题5分,满分10分):81.要在一个示波器的屏幕上同时显示两个信号的波形,可采用那些方法?82.什么是伺服电动机?有几种类型?工作特点是什么?83.有一个直流含源二端网络,用内阻为50K的电压表测得它两端的电压为100V,用内阻为150K的电压表测得它两端的电压为150V,求这个网络的等效电动势和内阻.84.有一三相半控桥式整流电路,接在次极电压U2为100V的三相变压器上求:1) 控制角a=0 度时,整流输出电平ULAV=?2) 控制角a=90度时,整流输出电压平均值ULAV=?中级维修电工复习题3的答案一题:1-10 AAADCDBADC 11-20 AACCDBADDC 21-30 BBAAAAABDA 31-40 ABAACACCBC 41-50 BBAACCCDCB 51-60 ABAADCCBBA二题: 61-70 71-80 81、答:1.采用双线示波器(具有两个电子枪,两套偏转系统的示波管)。2.将两个被测信号用电子开关控制,不断交替送入普通示波管中轮流显示,由于示波管余辉和人眼视觉暂留的缘故,当转换速度很快时,看起来就好像同时显示两个波形双踪示波器。82、答:伺服电动机(执行电动机),在自动控制系统中,用作执行元件,把所收到的信号转换成电动机轴上的角位移或角速度。分支流和交流两大类。其特点是:当信号电压为0时,无自转现象,转速随转矩的增加均匀下降,接到信号就迅速启动,失去信号立即停止,转速的大小与控制信号成正比。83解:UabEoRo/(Ro+Rb) (Ro表内阻)将两次测得的结果代入上式得100EoX50/(Ro+50)150=EoX150/(Ro+150)解得Eo200V Ro50k84解:1)ULAV=2.34U2(1+COSa)/22.34X100XCOS0=234V2)ULAV=2.34U2(1+COSa)/2=117V根据工程勘察报告揭露,本场地自地表至持力层深度范围内所揭露的土层主要由饱和粘土、砂土组成,具有成层分布的特点。leaders driving a vehicle accident caused by road accidents, 1, 1 people killed and direct economic losses amounting to more than 100,000 yuan. Third, high efficiency and low cost of the bus. Surveys show that, the operating costs of taxis for the 8200/. Is a fundamental priority of the reform, it is a difficult problem that must be solved in the reform process. Clearly, the post consumption averages three years before as a base and fine-tuned on the basis of this single practices must be improved. Improvements to adhere to three principles: first, under the existing policy provisions approved for public servants duty consumption standards, calibration, is not contrary to policy. Second, according to the local financial situation and peoples sustainability, public servants duty consumption standards approved, both financial reach, and people passing through. Third, according to the operational needs of civil servants responsible for authorized public servants duty consumption standards, both high and low positions, but also the nature of the work and the workload. In reform of method Shang, approved civil servants positions consumption standard to big unified, and small dispersed suitable, that most positions consumption project should according to policy provides proposed unified standard, consider to ranks, and units and the work task of differences sex, unified of standard should has elastic of and dynamic of, makes regions, and units in implementation unified standard Shi has must of flexible disposal right; but since set of standard must after financial, and audit, sector audit approved Hou to implementation. (C) reform package. Public servants duty consumption elasticity of consumption to limit consumption, turning mess into kitchen after dinner, follow the civil servant with a how to use personal title subsidies, or how to manage a personal duty consumption use of subsidies. Therefore, we must establish and perfect with public servants duty consumption monetization reform support of the series of governance systems such as the civil service examination of responsibility, system, low fault investigation system, the report said. While other measures to keep up. Discipline inspection and supervision organs, financial, auditing departments should strengthen supervision and inspection of public servants duty consumption monetization reform progress, to strengthen the reform of public servants duty consumption monetization system, measures to develop and monitor the implementation of inspection, not consumption as required, even shifting consumer behavior to stop, serious cases to deal with. Three ideas, public servants duty consumption monetization reform of politics, the economy and the deepening of the reform, public servants duty consumption as somewhere between a reform also demonstrated its importance and urgency. First of all, civil servants especially party and Government leaders and public servants duty consumption there are big drawbacks. NPC deputies and CPPCC members and the broad masses are concerned about. Secondly, the- 配套讲稿:
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