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电信专业英语期末试卷B及部分答案


20 07 -20 08 学年 第 1 学期 课程名称

专业英语
专业 级 班级

试卷 卷别

A B

□ √

考试 方式

闭卷 √ 开卷 □

学号

本试卷共



大题( 6 页),满分 100 分,考试时间 120 分钟。

线 栏 姓名 息

请在答题纸上作答,在试卷上作答无效。 一、根据英文单词或词组,写出中文意思(本题共 15 小题,每题 1 分,共 15 分)
1.
订 信

insulator conductor pulse sensor manual modulate nucleus hardware oscilloscope 脉冲

绝缘子 导体 传感器 手册 调制 核 示波器 硬件 多媒体 终端控制器 下行频谱 无线电话 电源线 正向偏压

2. 3. 4. 5. 6. 7.

考 专业

级 班级



8.


9.

10. multimedia

11. terminal controllers 13. wireless telephone


12. downlink frequency spectrum 14. power cord 15. forward bias

第 1 页 共 6 页

二、根据英文缩写,写出英文完整形式及中文意思(本题共 5 小题,每题 2 分,共 10 分)
1. 2. 3. 4. 5. BS LAN CPU IC RF 射频 基站 区域网路 中央处理器 集成电路

三、用连线使 A 栏与 B 栏匹配 (本题共 2 大题,每题 5 分,共 10 分) 1. Column A
(1) receiver (2) information source

Column B
(a) the medium used to transmit the signal from the transmitter to the receiver. (b) the unwanted which may cause distortions(失真) of sound in a telephone, or errors in telegraph message or data.

(3) noise (4) transmitter

(c) message which may written words, or spoken words, or some form of data. (d) an equipment which converts the message into a signal suitable for transmission over the channel.

(5) channel

(e) an equipment which can change the received signal back into a message and passes the message onto its destination.

2. Column A
(1) LAN (2) WAN (3) host computer (4) ISO (5) Microwave relay

Column B
(a) an international standards organization (b) a network that provides communications across country or the entire world. (c) a station which is used to receive and retransmit microwave signals. (d) a computer which is located on a network and provides services to other nodes connected to the network. (e) a network that provides communications within specific buildings or facilities.

第 2 页 共 6 页

四、选择适当的词或词组填空 (本题共 5 空,每空 1 分,共 5 分)
1. 2. 3. 4. _______ (In, On) this case, it is possible to determine the amplitude of the voltage. The flow of electrons _______ (is made of, makes up) electric current. The distortion is caused by the channel _______ (perfection, imperfection). ATM dated from the beginning of the 1980s, at the time, people______ (were trying, are trying) to find the most suitable technique for _______ (to switch, switching) high bit rate channel ate more than 100 Mbit/s..

五、选择适当的词填空 (本题共 5 小题,每题 1 分,共 5 分)
线 学号

1.

“Input A and input B equals output C” the statement can be expressed by the equation_______. A. AB=C B. A+B=C B. be conveyed C.
AB =C



2.
姓名 息

Some types of information cannot _______effectively without using sound. A. convey C. conveyed The speech _____ from the MSC on the new voice line connection via the other base station. A. transmits B. will transmit B. On C. will be transmitted C. From

3.





4.
级 班级 生

______high frequencies the loads may be inductive(感应). A. At Each channel unit in the BS is equipped _____ radio transmitter, radio receiver, and control unit. A. in B. with C. by

5.

考 专业

六、阅读理解 (本题共 5 小题,每题 3 分,共 15 分)


(1) Optical Fiber Communication The optical commutations system is essentially based on the use of optical fibers. Fundamental optical communication system construction is shown as Fig.18. Optical fiber cable functions as a transmission medium in the optical communications system. A light source converting electrical signals to optical signals (E/O converting) is set in the


transmitter side. An optical detector reconverting transmitted optical signals to electrical signals (O/E converter) is set in the receiver side. Thus, the light source and detector element, as well as optical fiber are functionally important devices in the optical communications system.
第 3 页 共 6 页

A semiconductor light source emits optical power when passing an electrical current through a junction. This junction is formed inside the semiconductor element. Therefore, optical output can be easily modulated by adjusting the electric current according to signals to be transmitted. The semiconductor detector absorbs optical power, exciting electrons in the detector. This process results in optical signal conversion to electrical signal current. The use of optical fibers presents many advantages, such as: less loss, light weight, wide band, flexibility, etc. ●Optical fiber loss is lower than PEF (Polyethylene foam ) or coaxial cable, and millimeter waveguide. Low loss values of less than 1 dB/km are attained in the 1.0 to 1.7um wavelength region, excluding the 1.4um wavelength. ●Optical cables are lighter than other cables, increasing installation simplicity and decreasing costs. ●Optical fiber transmission capacity is larger than any other cable. Since transmission capacity varies from a small to a large number of channels, optical fiber system design is flexible. It is applicable to virtually all fields currently using conventional communications systems. Silica, the main material used in optical fibers is not an electrical conduction. Thus, risk of electromagnetic induction, wave interference, and voltage difference between grounding points does not exist. This advantage enables expansion of cable applications. Questions for text: 1. 2. What is the optical cables used as in the optical communication system? Tell some advantages using optical communication system. (2) Charge, Current and Voltage As we know, matter is made up of atoms, which are composed of a number of fundamental particles. The most important of these particles are protons and neutrons found in the nucleus of the atom and electrons moving in orbit about the nucleus of the atom. Normally the atom is electrically neutral, the negative charge of the electrons balancing the positive charge of the protons. Particles may become negatively charged by gaining electrons from other particles. As an example, we may produce a negative charge on a balloon by rubbing it against our hair. The balloon will then stick to a wall or the ceiling, which are uncharged. Relative to the negatively charged balloon the neutral wall and ceiling are oppositely charged. We now define the coulomb (C) by stating that the charge of an electron is a negative one of 1.60218×10-19 coulombs. Putting it another way, a coulomb is the charge of about 6.24×1018 electrons. The symbol for charge will be taken as Q or q. The primary purpose of an electric circuit is to move or transfer charges along specified paths. This motion of charges constitutes an electric current, denoted by the letters i or I, taken from the French word

第 4 页 共 6 页

“intensite”. Finally, current is the time rate of change of charge, given by i=dq/dt. The basic unit of current is the ampere (A). An ampere is 1 coulomb per second. Charges (free elections) in a conductor may move in a random manner. However, if we want some concerted motion on their part, we must apply a so-called electromotive force (EMF).Thus work is done on the charges. We shall define voltage “across” an element as the work done in moving a unit charge (+1C) through the element from one terminal to the other. The unit of voltage, or potential difference, as it is sometimes called, is the volt (V). Questions for text:
学号 线

1. What fundamental particles is an atom composed of? 2. Which letter is usually used to denote the charge symbol? 3. What is the basic unit of voltage?





姓名

七、将下列英文翻译成中文 (本题共 12 小题,每题 3 分,共 36 分)
1. 2. 3. The primary purpose of an electric circuit is to move or transfer charges along specified paths. The invention of IC is a great revolution in the electronic industry. The three basic types of digital logic gates are the AND gate, the OR gate, and the NOT gate. 4. 5. The CPU must be able to fetch instructions from memory, decode their binary contents, execute them. When the initialization routine has finished, click on OK and the PC will restart. The load converts these current changes into voltage changes which form the alternating output voltage uo. 7. 8. 9. Although the term “network” has many definitions, most people would agree that networks are collections of two or more connected computers. In practice, a low-pass anti-aliasing filter(低通抗混叠滤波器) is used at the front end of the sampler to exclude frequencies greater than W before sampling. A light signal generated by a light-emitting diode(发光二极管) or laser is sent through the fiber. 10. But by using MP3, a 600M bytes music CD can be shrunk to 50M bytes or less. 11. The purpose of a communication system is to transmit information bearing signals through a communication channel.





级 班级



订 专业 系 装

6.

第 5 页 共 6 页

12. This transmission technique is also referred to as the store-and-forward transmission technique.

八、将下列中文翻译成英文 (本题共 2 小题,每题 2 分,共 4 分)
1.
2.

键盘是最常用的输入设备。 数字集成电路可用于计算机中。

第 6 页 共 6 页


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