本卷共分为2大题50小题,作答时间为180分钟,总分100分,60分及格。
一、单项选择题(共25题,每题2分,每题的备选项中,只有 1 个事最符合题意)
1、腰圆形线圈一般用在中、小型凸极同步电机__绕组上。A.补偿B.同心C.定子D.转子
2、观察一信号波形时,按输入信号频率为扫描频率的__倍的原则来选扫描频率。A.0.1~0.5B.1~5C.1~12D.5~20
3、波绕组与叠绕组嵌线的区别,仅在于波绕组无__,且换向片节距与叠绕组不同而已,其他的过程是一致的。A.压力线B.均流线C.电压线D.均压线
4、斜二测轴测图中,当坐标平面XOZ平行于轴测投影面时,轴测轴__的轴间角为90°。A.O1X1和O1Z1B.O1X1和O1Y1C.O1Y1和O1Z1D.O1X1和O
5、检查试验的任务是:及时发现产品制造质量的波动及原因,预防不良品的产生和出厂,为用户提供维修所必需的资料,将产品调整到适合于使用的__状态。A.最佳B.良好C.正常D.一般
6、发电机做直流耐压试验时,应加__倍的UN,持续1分钟不击穿为合格A.2.5B.1.5C.1.0
7、做绕组对地交流耐压试验时,如果电压表的指示、__,电流表的指示迅速增加,则说明对地绝缘被击穿。A.不变B.降为零C.升高D.左右摆动
8、按照规定,防爆电机隔爆外壳在精加工后应进行__,其目的是为了检查零件的缺陷。A.材料试验B.水压试验C.耐压试验D.绝缘试验
9、不锈钢弹簧管的允许测量范围是__。A.0.06~16MPaB.0.1~6MPaC.16~60MPaD.0.1~6MPa
10、平面的锉削有以下三种方法:顺向锉、交叉锉和推锉。__
11、异步电动机的能耗制动采用的设备是__装置。A.电磁抱闸B.直流电源C.开关与继电器D.电阻器
12、半精车对电机转轴需要磨削加工的__挡留有一定的磨削余量。A.端盖B.轴伸C.定子D.转子
13、下列绕组中需要使用转子端部绑扎设备的是__。A.异步电动机的定子绕组B.同步发电机的电枢绕组C.直流电动机的电枢绕组D.笼型电动机的转子绕组
14、凸极式同步电机转子磁极由磁极铁心.励磁绕组、阻尼绕组和__组成。A.阻尼环B.磁轭C.集电环D.平衡块
15、正弦交流电在单位时间内周期性变化的次数称为交流电的__。A.周期B.频率C.角频率D.相位
16、低压电机定子线圈做交流耐压试验__V持续1分钟A.1000B.500C.2500
17、普通电机绝缘结构的正常条件为环境温度不超过__,海拔高度不超过1000m。A.40℃B.30℃C.20 ℃D.0℃
18、操作文明是指在零件或产品加工装配中,严格执行__,杜绝野蛮加工和野蛮装配以及乱摔、乱敲的坏习惯。A.操作规程B.图样参数C.工艺要求D.劳动纪律
19、在化学反应过程中,一般的有机物反应__;有机物很多不是电解质,不导电。A.速度较快B.速度较慢C.速度适中D.不彻底
20、隐极式转子铁心一般由转子冲片、转子支架、空心转轴和__组成。A.护环B.中心环C.键D.平衡块
21、下列锉削方法中,能用于锉削平面及最后锉光的是__。A.交叉锉B.顺向锉C.旋转锉D.推锉
22、下列各项中,不属于零件图工艺分析步骤的是__。A.检查零件图样的完整性B.对零件技术要求的合理性进行审查C.审查零件结构的工艺性D.分析产品设计所用的各项标准。
23、The destruction of our natural resources and contamination of our food supply continue to occur, largely because of the extreme difficulty in affixing (把……固定) legal responsibility on those who continue to treat our environment with reckless abandon (放任). Attempts to prevent pollution by legislation, economic incentives and friendly persuasion have been met by lawsuits, personal and industrial denial and long delays---not only in accepting responsibility, but more importantly, in doing something about it.It seems that only when government decides it can afford tax incentives or production sacrifices is there any initiative for change. Where is industry’ s and our recognition that protecting mankind’ s great treasure is the single most important responsibility If ever there will be time for environmental health professionals to come to the frontlines and provide leadership to solve environmental problems, that time is now.We are being asked, and, in fact, the public is demanding that we take positive action. It is our responsibility as professionals in environmental health to make the difference. Yes, the ecologists, the environmental activists and the conservationists serve to communicate, stimulate thinking and promote behavioral change. However, it is those of us who are paid to make the decisions to develop, improve and enforce environmental standards, I submit, who must lead the charge.We must recognize that environmental health issues do not stop at city limits, county lines, state or even federal boundaries. We can no longer afford to be tunnel-visioned in our approach. We must visualize issues from every perspective to make the objective decisions. We must express our views clearly to prevent media distortion and public confusion.I believe we have a three-part mission for the present. First, we must continue to press for improvements in the quality of life that people can make for themselves. Second, we must investigate and understand the link between environment and health. Third, we must be able to communicate technical information in a form that citizens can understand. If we can accomplish these three goals in this decade, maybe we can finally stop environmental degradation, and not merely hold it back. We will then be able to spend pollution dollars truly on prevention rather than on bandages.Which of the following, according to the author, should play the leading role in the solution of environmental problems ()A.Legislation and government intervention.B.The industry's understanding and support.C.The efforts of environmental health professionals.D.The cooperation of ecologists, environmental activists and conservationists.
24、钢的表面热处理是仅对工件表层进行热处理以改变其__和性能的工艺方法。A.结构B.组织C.特点D.硬度
25、磁极与磁轭之间的连接方式有螺杆连接、鸽尾连接和__。A.焊接B.压接C.T形尾连接D.U形尾连接
二、多项选择题(共25 题,每题2分,每题的备选项中,有 2 个或 2 个以上符合题意,至少有1 个错项。错选,本题不得分;少选,所选的每个选项得 0.5 分)
1、绕线式异步电动机的最大电磁转矩与转子回路电阻的大小__。A.平方成正比B.成正比C.成反比D.无关
2、在电阻、电感和电容器串联电路中,出现串联谐振的条件是__A.Ul>UcB.Ul=UcC.Ul
3、判断通电直导体周围的磁场时,用右手握住通电直导体,让拇指指向电流方向,则弯曲四指的指向就是磁场方向。__
4、铣电机转轴键槽的注意事项是应在__铣床上铣出电机轴上的键槽。A.30°倾角B.45°倾角C.60°倾角D.立式
5、#1发电机副励磁机为永磁式发电机,其额定电压为__A.300B.472C.380
6、俯视图和左视图同时反映物体的__尺寸。A.长度B.宽度C.高度D.倾斜度
7、按工艺规定,湿热带型电机整个定子:F级电机浸155绝缘漆绝缘处理两次,出烘房后热态下在线圈表面喷有防霉能力的H31-7环氧聚酯铁红覆盖漆__次,再烘干。A.1B.2C.3D.4
8、验电时,必须用电压等级合适而且合格的验电器,在检验设备()验电。A.进出线两侧各相B.在进出线C.高低压侧
9、对无法估计的负载测量,可选择__量程挡测量。A.最小B.中间C.最大D.任意
10、10~100kW的电机,绕组的电阻值约为__。A.0.05~1ΩB.1~10ΩC.0.0l1~0.1ΩD.0.1~5Ω
11、螺纹的基本要求包括牙型、螺纹大径、__、精度和旋向。A.线形、螺形B.线数、螺形C.线数、螺距D.线形、螺距
12、电机绝缘结构按耐热性分为A、E、B、F、H五个耐热等级,设计时应按电机不同绝缘部位所达到的__来选择耐热性合乎要求的绝缘材料。A.实际温度B.设定温度C.额定温度D.最高实际温度
13、一台三相异步电动机的极数为4,该电动机的转速为__。A.960r·minB.1000r/minC.1450r/minD.1500r/min
14、介质损耗测试以用于检测6kV以上高压线圈的__。A.整体性和密实性B.损耗与绝缘C.损耗与效率D.绝缘与效率
15、无纬带绑扎工艺可分为__、预热、绑扎和固化等工序。A.变形B.整形C.增大D.缩小
16、以下绝缘安全用具中属于辅助安全用具的是__。A.绝缘手套B.验电器C.绝缘夹钳D.绝缘棒
17、三角形联结的电动机,将定子绕组的一个接点拆开,再__,测量其电流,其中电流小的一相即为断路相。A.同时通入交流电B.逐相通入交流电C.同时通入直流电D.逐相通入直流电
18、对指导操作的基本要求是要有培训计划,要与理论教育相结合,要与生产实际相结合,要重视__教育,要及时发现和解决问题,要认真进行总结。A.安全B.理论C.实际D.文化
19、装配好的磁极应根据磁极线圈接头位置的不同编上相应的序号,同时将质量接近的磁极装在__位置。A.相邻B.相同C.对称D.相反
20、电枢铁心压装时,铁心质量应符合图样规定,其偏差一般为±1.5%,铁心质量不足,将导致铁耗增加,铁心质量增加过多,可能使__下降。A.铜耗B.转速C.涡流损失D.磁滞损失
21、中心距较大时若采用齿轮传动会使结构庞大,故齿轮传动不宜用于距离较远的传动。__
22、带电灭火时,不能选用__来灭火。A.1211灭火器B.二氧化碳灭火器C.水D.干粉灭火器
23、绝缘材料的耐热性,按其长期正常工作所允许的最高温度,可分为__个级别。A.5B.6C.7D.8
24、下列不属于电机行业职工职业道德规范的是__。A.体现自我B.团结互助C.乐于助人D.积极协作
25、包带机在更换线圈品种或改变线圈直线长度时,只需要更换双弧形靠模板,改变齿条长度,调整__。A.摆角机构B.云母带C.扇形齿轮D.升高机构下载本文