重庆大学专业英语课程试卷(参考答案)

重庆大学专业英语课程试卷(参考答案)
重庆大学专业英语课程试卷(参考答案)

重庆大学专业英语课程试卷(参考答案)

2006 ~2007 学年 第 二 学期

开课学院: 电气工程 课程号:6000620 考试日期: 2007.6.24

考试方式:

考试时间:120分钟

二、学术词组或句子翻译(20points ): 〔(1)~(11)题:1分/题,(12)~(14)题:3分/题〕

becomes the primary winding; the other winding, to which the load is connected, is called the secondary winding.

⒀Our work is to bring about the transmission of power from where it is available

to where it is needed with as little loss as possible.

⒁This paper discusses solid-state power devices and its applications in three-phase AC induction motors.

三、根据英文意思找出合适的单词(从列出的单词)(10points )

四、英译汉

第一篇(9分)

当两台或两台同步电机互联,所有电机的定子电压和电流必须具有相同的频率,而且每台电机转子的机械转速也必须与此频率同步。因此,所有互联电机的转子都必须同步。发电机的电磁转矩阻碍转子旋转,所以必须由原动机施加机械转矩来维持旋转。要改变发电机的输出转矩(和功率),只有改变原动机输入的机械转矩。增大输入的机械转矩,其效果是将转子相对于定子旋转磁场的位置前移到一个新位置。相关,减小机械转矩或输入功率将使转子的位置后移。电磁转矩和机械转矩在同步电动机中所起的作用与在发电机中的作用相反。

第二篇(9分)

配电所通过变压器把中压变成低压,降压变压器有自动可变抽头的性能,从而调节低压值。低压的范围是单相120/240伏到三相600伏。配电所用于私人住宅,商业和公共建筑,以及小型工厂。配电所还包括电路开关,熔断器,避雷器,以保护贵重设备,并保证故障线路从系统中很快隔离出来。另外,控制设备,电力测量仪器,断路器,电容,电感和一些其它装置也可属于配电所的部分。

第三篇(9分)

电力系统经常遭受来自于大气放电的过电压,这种过电压被称作外部过电压或者雷电过电压,或者遭受由于系统闭合、开断,或故障产生、消除而引起的过电压。后者被称作内部过电压。这种分类还可以进一步划分为(1)以工频或谐波振荡的暂态过电压

题人

题人:

审题人:

命题时间:

教务处制

学院 专业、班 年级 学号 姓名

公平竞争、诚实守信、严肃考纪、拒绝作弊

线

(2)强阻尼和短持续时间的操作过电压。暂态过电压无一例外的发生在空载或轻载的情况下。因为有共同的起因,暂态过电压和操作过电压通常同时发生,在设计高压系统绝缘的时候必须考虑它们产生的共同影响。

第四篇(8分)

周波变换器供电同步电机调速系统的中间谐波仿真和实验研究

摘要――高功率同步电机调速系统通常由自然换向的周波变换器供电。周波变换器的输出电压中包含有影响电能质量并抑制允许频率范围的中间谐波/分谐波。同时,一个实际的周波变换器往往会导致定子电流的断续。考虑输出电流的断续以及输出电流的脉动对周波变换器的输入电流的影响,在出现中间谐波/分谐波的情形下,本论文讨论了一种仿真方法用来研究周波变换器供电的同步电机调速系统性能。对输出相电压、输出相电流、输入供电电流和磁场电流中的中间谐波进行了估计,并在实验模型上用实验结果进行验证。由于这些中间谐波引起的较明显的振荡转矩分量在一种典型情形下进行了辨识。其仿真结果对这种调速系统的电能质量研究以及在设计抑制这些中间谐波/分谐波的方法方面是有用的。

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ad if 命 封 线 密

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A majority of broadcasters in many countries were either state-owned or state-subsidized for much of the last century. Governments began to relax their control in the 1980’s by privatizing national broadcasters and granting licenses to dozens of new commercial networks. The rise of cable and satellite pay-television increased the spectrum of channels. Relatively inexperienced and often financed on a shoestring, these new commercial stations needed hours of programming fast. The cheapest and easiest way to fill airtime was to buy shows from American studios, and the bidding wars for popular shows were fierce. The big American studios took advantage of that demand by raising prices and forcing foreign broadcasters to buy less popular programs if they wanted access to the best-selling shows and movies. “The studio priced themselves out of prime time,” said Harry Evans Sloan, chairman of SBS Broadcasting, a Pan-European broadcaster. 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