维修电工技能竞赛理论考试题库(有答案)

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurate. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, q uantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newsp ape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their i nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the most important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de part ments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and exces sive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Comm ittee Secretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted difficult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Governor, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

维修电工技能竞赛理论考试题库

一.填空题

1.导线并联时的电阻为

2.5Ω，串联时的电阻为10Ω，则两条导线分别是5Ω和5Ω。

2.两电容器的总容量分别是C1?C2,将它们并联使用，

总容量为C1+C2

3.三相对称负载做星形连接时，常采用三相四线制。

4.三相输电线，端线与中线间的电压称相电压。

5.设一段导线电阻值为2R，若将导线的直径增大一倍，长度不变，则电阻为0.5R。

6.自动往返控制线路属于正反转控制线路。

7.三相异步电动机的机械特性是指转矩与转速的关系。

8.根据我国客车车体配线绝缘标准规定，交流配线两线间及各线与大地间的绝缘电阻值应大于1MΩ。

9.漏电保护器绝缘电阻不低于1.5MΩ。

10.1KV以上的电气设备和1KV以下的中性点不接地系统中的电气设备均应采用保护接地。

11.单相设备接在三相线路中，其中最大负荷相的设备容量不超过三相平均容量的15%，则可认为该三相线路负荷是平衡的。

12.一般架空导线不能像一般导线那么选，要特别注意机械强度问题。

13.交流电磁铁的行程吸合前的气隙增大时，其电流增大，吸力不变。

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, f ocus spe cification. To give full play to the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with peo ple, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improve t he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o further pay spe cial attention to t he daily w ork of the other Office Syst em. Confidential wor k re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strengthening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernization of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology develo pment

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurat e. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newspape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the mo st important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee Secretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted diff icult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Govern or, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

14.电动机空载试验时，其任一相的空载电流与三相空载电流平均值的偏差不得大于10%。

15.一般容量不大而又需要中性点的变压器，多采用Y/Y0联接，其中Y表示高压绕组做Y联接，但无中线。

16.当采用移动电刷位置的方法来改善换向条件，减小电刷与换向器间的火花时，对直流电动机应顺电机旋转方向来移动电刷。

17.常见的基本偏置电路有固定偏置、电压负反馈偏置、电流负反馈偏置3种。

18.触发电路必须具备同步电压形成、移相、触发电压形成和输出3个基本环节。

19.异步电动机在负载不变时，假定转速偏低，则转差偏大，转子受到的电磁转矩变大，迫使转速升高，结果使转速稳定。

20.直流发电机的电磁转矩是制动转矩，其方向与电枢旋转方向相反。

21.直流电动机的制动常采用能耗制动、反接制动和回馈制动等3种方式。

22.电动机的启动特性由启动电流、启动转矩、启动时间、启动的可靠性、启动时绕组的损耗和发热等因素决定的。

23.变压器大修进行器身测试时，应用2500V兆欧表测试绕组之间及对地的绝缘电阻和吸收比。

24.为了提高电源的利用率，感性负载电路中应并联适当的电容，以提高功率因数。

25.步进电动机工作时，每输入一个电脉冲，电动机就转过一个角度

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play t o the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improv e t he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o furth er pay spe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strength ening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernization of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology develo pment

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurate. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newsp ape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their i nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the most important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee S ecretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted difficult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Governor, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

或前进一步。

26.电气控制电路设计，应最大限度的满足机械设备加工工艺的要求。

27.按照工艺要求，在进行电气设备大修时，首先要切断总电源，做好预防性安全措施。

28.对一般机械设备编制电气大修工艺时，应查阅有关设备档案，包括：设备安装验收记录，故障修理记录等，以全面了解电气系统的历史技术状态。

29.一般要求保护接地电阻为4Ω以下。

30.为了在发生故障时能够迅速地切断电源，通常在电源与变频器之间要接入低压断路器和接触器。

二.选择题。

1.电动机轴上的机械负载增加时，电动机的电流将（增大）。

2.两只额定电压相同的电阻，串接在适当的电压上，则功率较大的电阻（发热量较小）。

3.变压器负载增加时，将使（原边电流增加）。

4.金属导体的电阻与（外加电压）无关。

5.在机床控制电路中，起失压保护的电器是（交流接触器）。

6.电压表A的电阻是2000欧，电压表B的电阻是400欧，量程都是15V。当他们串联在12V的电源上，电压表B的读书将是（2V）。

7.桥式起重机主钩上升控制与凸轮控制器的工作过程基本相似，区别在于它是（接触器）来控制的。

8.在检修或更换主电路电流表时，维修电工将电流互感器二次回路

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play to the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improve he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o further pay s pe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strengthening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernizatio n of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology development

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurat e. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newspape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the mo st important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee Secretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted diff icult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Govern or, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

（短路），即可拆下电流表。

9.测量电感大小时，应选用（短路）。

10.高频信号发生器使用时，频率调整旋钮改变的是主振荡回路的（可变电容）。

11.牵引机械（如电车、机械车、电瓶车），及大型轧钢机种，一般都采用直流电动机而不是异步电动机，原因是异步电动机的（调速性能差）。

12.维修电工在操作中，特别要注意（安全事故的防范）问题。

13.测温仪由两部分构成，即（探头）部分及主机部分。

14.变频器的输出不允许接（电容器）。

15.（变频器中的控制电路）会有规律地控制逆变器中主开关的通断，从而获得任意频率的三相输出。

16.重复接地的作用是降低漏电设备外壳的对地电压，减轻（零线）断线时的危险。

17.（两相触电）是最危险的触电形式。

18.电磁调速异步电动机速度反馈主要靠（测速发电机）来完成的。

19.当导线和磁场发生相对运动时，在导线中产生感应电动势，电动势的方向可用（右手定则）确定。

20.线圈中的感应电动势大小与线圈中（磁通的大小无关，而与磁通的变化率成正比）。

21.三相异步电动机用自耦降压启动器70%的抽头降压启动时，电机的启动转矩是全压启动转矩的（49%）。

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play t o the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improv e t he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o furth er pay spe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strength ening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernization of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology develo pment

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurate. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newsp ape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their i nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the most important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee S ecretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted difficult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Governor, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

22.决定三相异步电动机转速的因素是（绕组磁极对数和电流频率以及转差率大小）。

23.三相同步发电机，当转速和励磁不变时，若负载增加，输出电压反而升高，则该负载性质为（电容性的）。

24.为了降低铁心中的（涡流损耗），碟片间要互相绝缘。

25.交流电磁铁动作过于频繁，将使线圈过热以致烧毁的原因是（衔接吸合前后磁路总磁阻相差很大）。

26.在下列直流稳压电路中，效率最高的是（开关型稳压电路）。

27.在电源频率和电动机结构参数不变的情况下，三相交流异步电动机的电磁转矩与（定子相电压的平方）成正比关系。

28.为了使三相异步电动机的启动转矩增大，可采用的方法是（适当地增大转子回路电阻值）。

29.电动机回馈制动的原理是将轴上输入的机械能转变为电能回馈电网，因此，它是一种（节能的）制动方法。

30.为了保证拖动系统顺利启动，直流电动机启动时，一般都要通过串电阻或降电压等方法把启动电流控制在（≤2-2.5倍）额定电流范围内。

三、判断题

1.电流表的内阻远比电压表的内阻小，因此不能并联在线路中。（√）

2.通电导体在磁场中所受电磁力的方向由左手定则确定；而导体在磁场中作切割磁力线运动时，产生的感应电动势方向由右手定则确定。（√）

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play to the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improve he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o further pay s pe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strengthening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernizatio n of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology development

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurat e. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newspape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the mo st important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee Secretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted diff icult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Govern or, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

3.交流电变化一周所用的时间叫周期，每秒钟变化的周数叫频率。（√）

4.在部分电路中通过电阻的电流与电阻两端的电压成正比。（√）

5.变压器是由铁心和绕组组成的。（√）

6.安全电压规定为36V以下，安全电流规定为100mA以下。（×）

7.熔丝常用的材料是由铅锡合金制成的。（×）

8.电压互感器、电流互感器在运行中，副绕组均不能开路。（×）

9.电气照明线路一般由电源、导线和开关组成。（×）

10.螺口灯头安装时火线经过开关口接螺口，中性线接顶芯。（×）

11.电压互感器、电流互感器在运行中，副绕组均不能开路。（×）

12.用交流电压表测得的电压值为交流电压平均值。（×）

13.为了提高功率因数，常在感性负载中串联电容。（×）

14.X62W铣床电气线路中采用了完备的电气联锁措施，主轴启动后才允许工作台进给运动和快速移动。（√）

15.三相对称负载星形联接电路中I线=I相。（√）

16.直流——交流变频器，是指把直流电能一般可采用整流电源转变为所需频率的交流电能，所以也叫逆变器。（√）

17.同步电动机在停车时，使转子绕组励磁的可控整流电源处于逆变状态，可将励磁绕组的能量回馈到交流电网，这样便于停车，也可保护整流桥中的晶闸管。（√）

18.在设计电动机的启动、制动、正反转、调速等控制线路时，应尽量采用比较典型的控制电路。（√）

19.两个固定的互感线圈，若磁铁介质改变，其互感电动势不变。（×）

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play t o the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improv e t he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o furth er pay spe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strength ening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernization of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology develo pment

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurate. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum.

On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newsp ape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their i nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the most important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d

dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee S ecretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted difficult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Governor, not a uthorized by County lea ders, not the Gover nor. Third i s to solve

the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

20.通电线圈产生磁场的强弱，只与线圈的电流和匝数有关。（×）

21.具有电抗器的电焊变压器，若减少电抗器的铁心气隙，则漏抗增加，焊接电流增大。（×）

22.分相式单相电动机的旋转方向是可以改变的。（√）

23.地磁转差离合器一异步电动机调速系统是以异步电动机为原动机，通过改变电磁转差离合器的励磁电流的大小和方向来实现调速。（√）

24.中频感应熔炼炉的中频是由晶闸管并联逆变器和感应圈与电容组成的LC谐振电路共同产生的。（√）

25.正确合理地选择电动机，主要是保证电能转换为机械能的合理化，节约电能，且经济技术指标合理，满足生产机械的需要。（√）

26.三相异步电动机的启动转矩与定子电压的平方成正比关系，与转子回路的电阻值无关。（×）

27.直流电动机的启动转矩的大小取决于启动电流的大小，而启动电流的大小仅取决于启动时电动机的端电压。（×）

28.绕线转子异步电动机采用电气串级调速具有许多优点，其缺点是功率因数较差，但如采用电容补偿措施，功率因数可有所提高。（√）29.机床的伺服装置就是以机床移动部件的位置和方向为控制量的控制装置。（×）

30.CPU是PLC的核心组成部分，承担接受、处理信息和组织整个控制工作。（√）

四．简答题

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play to the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of

messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s

should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improve he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o further pay s pe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strengthening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernizatio n of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security

enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology development

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurat e. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum. On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newspape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the mo st important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee Secretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted diff icult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Govern or, not a uthorized by County lea ders, not the Gover nor. Third i s to solve the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

1.电力变压器有哪些故障及其危害？

答：1）变压器内部绕组的相间短路，单相匝间短路，单相接地短路等。2）变压器外部绝缘套管及引出线上的相间短路，单相接地短路等。变压器内部故障不仅会烧毁变压器，而且由于绝缘物和油在电弧作用下急剧气化，容易导致变压器邮箱爆炸。套管及引出线上发生相间或一相接地短路时，将产生很大的短路电流。

2.步进电动机的作用是什么？

答：步进电动机是一种把电脉冲信号转换成直线位移或角位移的执行元件，可用来实现高精度的位移控制。

3.变频调速适用于哪些场合？

答：三相异步电动机变频调速具有很好的调速性能，目前已经在轧钢机、鼓风机、化工设备及铁道机车等场合获得里广泛使用。

4.在同一供电系统中，为什么不允许有些电气设备采用保护接地，而另一些电气设备采用保护接零？

答：如果在同一供电系统中，混合使用保护接地和保护接零，则当采用保护接地的电气设备发生绝缘击穿故障时，接地电流因为受到保护接地装置的接地电阻的限制，使短路电流不可能很大，因而保护开关不能动作，这样接地电流通过变压器工作接地时，使变压器的中性点电位上升，因而使其他所有采用保护接零的电气设备外壳均带电，这是很危险的，必须严格禁止。

5.在带电的电流互感器二次回路上工作时，应采取哪些安全措施？答：1.严格防止电压互感器二次侧短路和接地，应使用绝缘工具，戴

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play t o the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improv e t he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o furth er pay spe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strength ening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernization of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology develo pment

out city created, a nd care masses life, focus work, i n-dept h investigation, more out bouti que master pie ce, makes we of rese arch re sults mor e to into le d of decisi on vi sion, more to i n nati onal some ha s effect of newspaper Sha ng published, for a dvance work, and publicity cha ngde play due of role. Third, informati on submitted to be pragmati c. Quick a nd timel y. T he ancients said: for the time system; stateme nt back for t he time bei ng, nothi ng. Therefore, the submi ssion of information to do "four", that is, find the problem faster, editorial writi ng, se nd a nd rea d faster appr oval and feedba ck to implement quickl y. To be tr ue and accurate. True mainly reflect the full pi cture of events, one is one, two, thi s is the life of the information. Accura cy is primarily qualitative a nd qua ntitative que stions, quantitative obje ctive of publi cQualitative logi c. To be reliable a nd useful. We submit inform ation to have access t o de cisi on-making, to g uide and promote t he work a nd solve practica l problems. Mixed cum. On the negative informati on a nd emerge ncy i nformation, ra pid e scalati on i n strict a ccorda nce with the procedures, firm, newsp ape r, ne wspa pers, never late, fail to re port, false claim a nd skimmi ng. Investe e 2. supervision and insist on, ar ound a nd pr otecti ng their i nterests to touch the tr uth, see k practical re sults. Adhere to people-orie nted, the most important thi ng is to re alize, safeguard a nd develop the f undamental intere sts of the overwhelming majority of the people. We carry out inspe ction, so must go dee p among t he masses, go dee p into t he realitie s, always pay attention to the people's livel ihood, to grasp t he publ ic sentiment, a nd e arnestly safeguard t he be nefit, addressi ng the masses are m ost concerne d about a nd refle cting the stronge st issues, efforts to solve t he pr oblem of deci sions impl emented a nd not implemented. One is to stick to principl es. Right of i nspecti on is one of the most important pow ers of the Office, should not only dare to use, but also with cauti on. So-calle d dared to use, i s to hold a number of important i ssue s, bold supervisi on ov er supervisi on, tra ck inspe ction, problems are not solved do not pass, the blame does not hold did not miss, dissatisfaction of the masses di d not miss, the real right of supervi sion authority, with the benefits. Call wit h ca uti on, is supervisi ng de partments should stre ngthe n the consci ousne ss of aut horize d strictly a ccordi ng to pr oce dure, preventi ng the supervi sion and excessive to preve nt adding burde n to grass-roots. To thi s end, the supervisi on De partment of the Party Committee of supervi sion must be under city and County party Committee S ecretary-General (Office). Second, we should focus on. Is the Gover nor, those relate d to the gl obalEve nt, Gover nor the protra cted difficult, strong Gover nor duri ng emergency urgent. Not havi ng special departments in charge of the Ge neral Gover nor, under t he normal proce dure can do g ood thing s not Governor, not a uthorized by County lea ders, not the Gover nor. Third i s to solve the problem. The pur pose of supervi sion, to resolve the pr oblem. To a dher e to and further impr ove the

2.短路电流互感器二次绕组时，必须使用短路片或短路线，应短路可靠，严谨用用导线缠绕的方法。

3.严禁在电流互感器在短路端子之间的回路上和导线上进行任何工作。

4.工作必须认真、谨慎，不得将回路的永久接地点断开。

5.工作时必须有专人监护，使用绝缘工具，并站在绝缘垫上。

6.提高电气线路的功率因素有哪些措施？

答：（1）减少变压器和电动机的浮动容量，使它们的实际负荷达到额度容量的75%以上；

（2）调整负荷，提高设备利用率，减少空载运行的设备；

（3）长期运行的大型设备采用同步电动机传动；

（4）大容量绕线型异步电动机同步运行；

（5）在高压和低压电力线路中适当装置电力电容器组。

eelings survey, by looki ng up publi c se ntiments to fi nd pr obl ems. Pr oblems will increase its special supervisi on, set up accounts, hol d on to it. We shoul d conscie ntiously impleme nt the lea ding contra cting matters, se cure d, ha d a n answer to everything, t hen settles rate of 100%. Have an im pact on some of the outsta ndi ng issues, supervisi on department s and information component s togethe r, play t he supervi sory rol e of the news me dia to promote pr obl em solvi ng. Inve stee 3. i nsist on a daily run, around the practi ce of truth catching efficie ncy, focus spe cification. To give full play to the party Office around connecting, coordi nating i nternal a nd exter nal features, contact, rally at all level s, to motivate every a spe ct, adhere to t he trut h, strengt heni ng standardized manag ement to a chieve coherent, efficient and effective functioning of the da ily work of the Party Committee. Is processing messages should strive to streamline, standardize and quality. Streamlining is to control the number of messages, compress message s, reduci ng procedures, im prove messag e ha ndli ng efficiency. S pecifications, is t o strictly e nforce the ba n issued by the Communi st party aut horitie s in document handling reg ulations a nd pr ovincial and munici pal regulati ons, conscienti ously strengthen a nd impr ove communications manageme nt to ensure that party docume nts or derly. High qualit y, is t o improve the quality of message processi ng, it is nece ssary to a ccurately implementi ng the i ntention of the Party Committee, cl earance, good communications, poli cy pr ogram closed, e nsuring that t here is no error. Second meeting scheduled to ensure thoroug h, safe a nd efficie nt. Any arrangeme nts for the meeti ngs a nd eve nts, carefully arranged, item-by-item interface impleme nted, sure. o vigor ously streamline meeti ngs, a ctivities, number of pressure reducti on, scale t o ensure that le adership emer ged from the Ge neral Conference and entertai nment servi ces, focus on big thi ngs, matters. T hird, re cepti on service s should lay stress on huma ne, personal, cult ural and human. Recepti on and work directly with people, re cepti on services directly affecting t he Office of party Committee The image of the region. At the same time stre ngthe ning the constr ucti on of library, improve he re cepti on conditi ons, more human-ori ented, persona l, cultural w ork int o the re ce ption, a little more huma n needs, a little more human care more humane atmospher e, and constantly impr ove the service, improv e the quality of servi ce. M eanw hile, t o further pay s pe cial attention to t he daily w ork of the other Office Syst em. Confidential work re sponsibility sy stem for leadi ng ca dres to implement security as a leade r, to improve t he confidentiality of classified personnel, especi ally leadi ng ca dres, strengthening party a nd Governme nt focus on vital sect ors of security management, to adva nce priva cy manageme nt standar dization, modernizatio n of se curity te chniques a s a mea ns of a dministration accor ding t o law a nd security enforceme nt, ensure the safety of the party and State secrets. Confide ntial work to meet the dema nds of new technology development

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