新疆2015年下半年电机装配工：电力机车电工模拟试题

新疆2015年下半年电机装配工：电力机车电工模拟试题本卷共分为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、把电能转变成机械能的功率器件是__。

A．自整角机B．测速发电机C．伺服电动机D．旋转变压器2、异步电动机的检查试验项目有：绕组对机壳及绕组相互间绝缘电阻的测定；绕组在实际的冷状态下直流电阻的测定；空载试验；__试验；振动的测定等。

A．机械B．旋转C．停转D．堵转3、电机三相绕组电流平衡试验时，如果三相电流的最大值或最小值与平均值之差不超过平均值的__，且数值与同型号、同规格的电机接近则为合格。

A．±1%B．±3%C．±5010D．+10%4、半开口槽的每个槽内嵌__个线圈。

嵌第一个节距线圈时，为了使下层线圈很好地放到槽底，下层边嵌完后，垫好层间垫条用压线板压紧。

A．1B．2C．3D．45、电葫芦使用时__。

A．可以超载B．可以倾斜起吊C．吊钩上升不要超过极限位置D．吊钩下降时可以着地6、如果在建立表stock.dbf时，将编号字段设置为主索引；能保证数据的______。

A．实体完整性B．域完整性C．参照完整性D．表完整性7、三相异步电动机定子绕组是三相对称绕组，共有6个出线端，3个起始端和3个末端，出线端标识按国家标准，第二相始端的标识是__。

A．V1B．U1C．L1D．W18、影响电机绕组绝缘电阻的主要因素是绝缘体积电阻数值的大小，工艺能稍微提高其数值，__升高也会使绝缘电阻下降。

A．导磁性能B．导电性能C．温度和湿度D．温度和电晕度9、交流电机的耐压试验对不良绕组绝缘有破坏作用，因此，只有外观检查合格的半成品和__合格的成品，才能进行耐压试验。

A．气隙检查B．空转检查C．极性检查D．绝缘电阻测定10、#3送风机电机润滑油压正常应控制在__ 范围内比较理想;A．0.15MP-0.25MPB．0.50-1.0MPC．1.0MP-1.50MP11、下列不属于串励直流电动机的特点（）。

A．绕组导线截面粗B．绕组匝数少C．励磁绕组和电枢绕组串联D．需提供两个电源12、示波器在测试过程中，如需要短时停止使用，可将扫描范围旋置在__挡。

A．10～100HzB．1kHzC．10kHzD．100kHz13、__主要由螺杆、螺母和机架组成。

A．齿轮传动B．螺纹传动C．螺旋传动D．链传动14、绕入式软绕组是直接将导线绕入槽内的绕组，端部很短，可以节省导线，对__大的转子或直流电枢绕组特别适合。

A．跨距B．节距C．齿距D．短距15、功率表读数时，读取功率表指针所指格数__刻度每格数代表的瓦特数C就等于测量的功率数。

A．乘以B．除以C．加上D．减去16、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17、三相电动机相带的分布规律之一为V相带__电角度。

A．滞后U相带120°B．超前U相带120°C．滞后U相带120°D．超前U相带60°18、当电动机绝缘厚度一定时，击穿电压与材料有关，材料的__强度高，则电动机绕组绝缘的击穿电压高。

A．燃点B．绝缘C．耐电D．机械19、在直流电动机中，电枢的作用是__。

A．将直流电变为交流电B．将交流电变为直流电C．在气隙中产生磁通D．将直流电能转换成机械能20、电流在__A以上的串励绕组和大型电机的并励绕组，常用裸铜扁线绕制成形。

A．50B．75C．100D．20021、下列选项中，不属于链传动特点的是__。

A．传动中产生动载荷和冲击B．平稳性差，有噪声C．寿命短，易磨损D．安装要求不高22、人体触电后危险程度的决定因素之一是通过人体电流的__。

A．频率B．相位C．正负D．波形23、同步发电机负载运行时，电机内的气隙磁场__.A．是由转子励磁磁势产生的B．是由转子励磁磁势、定子电枢磁势共同产生的C．由定子电枢磁势产生的24、右手握住导线，四指方向为磁场方向时，伸直的拇指为__的方向。

A．电场B．电压C．电流D．磁场25、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.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。