电气专业英语试卷-复习A卷(共4页).doc

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1、精选优质文档-倾情为你奉上电气专业英语试卷一.中英文单词互译. (1*25=25)1inductor 2sensor 3manufacture 4insulator 5conductor 6Current 7 8voltage 9shaft 10switch11. 磁场 12频率 13发电机 14速度 15二极管 16万用表 17继电器 18电池 19加速度 20齿轮 21三极管 22硅23电阻 24电容 25晶体二根据英文词组，写出中文意义（2*10=20）on the other handtake advantage ofnegative chargeelectric fieldfree

2、electroncurrent flowsine waveseries circuitparallel circuitPN junction三 英文翻译成中文 (3*10=30)1. Press start pushbutton. Circuit is completed when the normally open pushbutton (PB) is momentarily closed. 2.Current flows from voltage source, through normally closed stop PB, through start PB, through the c

3、ontactor coil, to the other side of the voltage source. 3.This energizes the coil and causes all contacts to close4. Contacts close. Motor will start since AC voltage is applied through the contacts directly to the motor. 5.The holding contact cause the current path through the coil to be completed

4、after the start PB is released.6. Motor will run.7. Press stop pushbutton.8. The current path is opened by momentarily opening the normally closed stop PB. 9.The coil deenergizes, causing the contacts to open.10. Motor will stop.四根据英文缩写，写出英文完整形式及中文意思（2*5=10）英文完整形式中文意思PLCACCNCDCFMS五.根据下列短文填空（1*10=10）

5、Forces between two electrically-charged objects can be extremely large. Most things are electrically neutral; they have equal amounts of positive and negative charge. If this wasnt the case, the world we live in would be a much stranger place. We also have a lot of control over how things get charge

6、d. This is because we can choose the appropriate material to use in a given situation.Metals are good conductors of electric charge, while plastics, wood, and rubbers are not. They are called insulators. Charge does not flow nearly as easily through insulators as it does through conductors, which is

7、 why wires you plug into a wall socket are covered with a protective rubber coating. Charge flows along the wire, but not through the coating to you.Materials are divided into three categories, depending on how easily they will allow charge (i.e., electrons) to flow along them. These are: conductors

8、 - metals, for example semi-conductors - silicon is a good example insulators - rubber, wood, plastic for example Most materials are either conductors or insulators. The difference between them is that in conductors, the most outer electrons in the atoms are so loosely bound to their atoms that they

9、 are free to travel around. In insulators, on the other hand, the electrons are much more tightly bound to the atoms, and are not free to flow. Semi-conductors are a very useful intermediate class, not as conductive as metals but considerably more conductive than insulators. By adding certain impuri

10、ties to semi-conductors in the appropriate concentrations the conductivity can be well-controlled.1. _ are good conductors of electric charge, while plastics, wood, and _ are not. 2. Materials are divided into three categories. They are _, _ and _. 3. Plastics, wood, and rubbers are used as examples

11、 of _. 4. _ is a good example of semi-conductors. 5. Semi-conductors are a very useful _ class, not as _ as metals but considerably _ conductive than insulators. 六根据下列短文回答问题,回答请使用英文。（1*5=5）Electric PotentialElectric potential is what drives current. You may know electric potential by another term th

12、at we will use .voltage. This name comes from the unit of potential, which is the volt (denoted V). When you buy an AA battery, you are buying a device that provides a potential of 1.5 V between its positive and negative terminals. Your car battery maintains about 12 V between its terminals. And the

13、 potential between the two slots in a household electrical outlet is about 120 V. You are probably already familiar with a basic truth about electric potential. All other things being equal, a greater potential will create a greater current. But what is electric potential? Water can provide a good a

14、nalogy (although far from perfect!) for both current and potential. Consider a pipe that comes out of the bottom of a large tank of water. You open the spigot and water flows. The flow rate of the water is analogous to current. Common sense tells you that the higher the water level in the tank, the

15、higher the flow rate in the pipe. The height of the water level is analagous to electric potential. A greater potential will cause a greater current.Where this analogy fails is with the battery. The tank stores water and as the height slowly decreases, so does the water flow. A battery does not stor

16、e charge! It is always electrically neutral and for whatever amount of charge leaves one terminal, an equal amount must come into the other. A battery is more analogous to the water pump. A battery, therefore, is an electron pump! It has the ability to push electrons directly proportional to its vol

17、tage rating. And, it does this through a chemical reaction. The battery becomes discharged, (an unfortunately misleading term), when the chemicals in the battery are used up. Most batteries maintain a fixed potential until near the end of their life. The 120 V potential of a household outlet is produced in a very different way. 1. What is analagous to electric potential?2. What is more analogous to the water pump? 3. What is a battery?4. What can a battery do? And how?5. What do most batteries maintain until near the end of their life? 命题人：周敏 校对：陈歆专心-专注-专业