复习卷3
一.中英文单词互译. (1’*25=25’)
1．inductor 2．sensor 3．manufacture 4．insulator 5．conductor 6．current 7．normally open 8．voltage 9．shaft 10．switch
11. 工件 12．链传动 13．发电机 14．旋转 15．螺钉 16．万用表 17．继电器 18．气动 19．加速度 20．齿轮 21．螺纹 22．车床 23．参观 24．连轴器 25．铣床
二．根据英文词组，写出中文意义（2’*10=20’）
surface processing demand industrial robots show daily maintenance electric field drilling machine spindle gearbox
manufacturing department rotary part parallel circuit programming language
三． 英文翻译成中文 (30*1=30’)
1．Before measuring a resistance, it is important to check the zero adjustment. .The procedure is as follow:
(1) Set the range selector switch on the desired range.
(2) Connect the test leads together. The indicating needle should point to zero. (3) If the needle is not aligned with zero line, turn the zero adjustment until the needle and the zero line are aligned.
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装 订 线
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batteries will deteriorate rapidly.
(4) CAUTION: Be sure the circuit is deenergized.
Note: Do not leave the test leads connected together, because under zero resistance the
(5) Connect the test leads across (in parallel with) the component or circuit to be measured.
四、根据英文缩写，写出英文完整形式及中文意思（2’*5=10’） PLC AC CNC DC FMS
英文完整形式 中文意思 五．根据下列方框中所给的词填空（1’*5=5’）
wires current resistance heat cool produces collisions hot
Resistance in a material arises from the collision of electrons with the atoms and with each other as they move. The ___ 1 ___ produce heat, increasing the temperature of the material. Consider the ordinary toaster. Current flows through the ___2 ___ of the power cord and through the toaster's filament (the glowing wire you see inside). The same current must flow in the power cord as flows through the filament. The cord has very little ___ 3 ___, while the filament has considerably more. Since the filament has a much higher resistance than the cord, it ___ 4 ___ much more heat. That's as it should be. You want the heat for your toast, but you do not want the power cord
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getting ___ 5 ___! The standard incandescent light bulb is another example. The filament in the light bulb glows white hot (hence, the word \light and a lot of heat as well. But, the low-resistance power cord stays cool.
六．根据下列短文回答问题,回答请使用英文。（2’*5=10’）
Electric Potential
Electric potential is what drives current. You may know electric potential by another term that 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 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 analogy (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 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 store 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 voltage rating. And, it does this through a chemical reaction. The battery becomes \(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?
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电气专业英语试卷-周 敏-复习卷3
