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电气工程专业试题及答案（一）-大学生学习网《电气工程》复习试
电气工程专业期末复习试题及答案（一）
考试科目 专业英语
自动控制与机械工程 学院 电气 专业 10 级 1、2、3 班
学生姓名 学号 题号 总 分 评分
一、Translate the Following Vocabulary into Chinese( 10 scores )
1. transducer
2. dielectric
3. superposition theorem
4. step pulse
5. inrush current
6. gas-insulated substations
7. transistor
8. parallel-in
9. potential transformer
10. rechargeable battery
二、Translate the Following Vocabulary into English( 10 scores )
1.稳定性
2. UPS
3.根轨迹
4.自动控制系统
5.电力系统
6.频域
7.运算放大器
8.同步发电机
9. ALU
10.高次谐波
三、Translate the Following Sentences into Chinese( 30 scores )
1．Incipient faults are those faults, which are initially minor in nature and of no immediate hazard but which could grow slowly into major faults if left unattended, thus causing damage to the transformer. ( 6 scores )
2．The purpose of a user interface is to provide for the use of Operating System resources, primarily the CPU, for processing a user's computational requirements. ( 6 scores )
3. Power system stability may be broadly defined as the property of a power system that enable it to remain in a state of operating equilibrium under normal operating conditions and to regain an acceptable state of equilibrium after being subjected to a disturbance. ( 6 scores )
4. A variation of the speed from the desired value, due to a change of mechanical load on the shaft, can in no way cause a change in the value of the applied armature voltage to maintain the desired speed. ( 6 scores )
5. In case of a short circuit, there would only be the small resistance of the copper wire being in opposition to the great current caused, and that is why the wire would get red-hot and a fire would be caused. ( 6 scores )
四、Translate the Following Paragraphs into Chinese( 50 scores )
1. The purpose of a substation is to transform the characteristics of the electrical energy supplied to some form suitable for use, as for example, a conversion from alternating current to direct current for the use of city railway service, or a change from one voltage to another, or one frequency to another. ( 10 scores )
2. Your computer’s graphics card takes signals from the processor and uses them to “paint” an image on the screen. A graphics card is installed inside the computer’s system unit and provides a connection for the monitor’s data cable. Your computer’s graphics card has to do a lot of work and must do it quickly. To display videos, for example, it repaints every pixel on the screen 15 times per second. More expensive “accelerated” graphics cards are equipped with circuitry that optimizes such tasks. ( 10 scores )
3. An autonomic or self-adaptive or self-optimizing system may, however, be used to give the best possible performance. In this type of device, of which there are several classes, the parameters of the controller are automatically adjusted so that the system gives an optimum performance according to some in-built criterion of merit. Such systems are more complex than ordinary feedback control systems and require much additional equipment. The idea of autonomic control was conceived by Draper and Li and was first published in 1951. ( 10 scores )
4. Any electrical motor can be brought to a standstill by suddenly reconnecting the supply to reverse the direction of rotation (reverse current braking). Applied under controlled conditions, this method of braking is satisfactory for all drives. Its major disadvantage is that the electrical energy consumed by the machine when braking is equal to the stored energy in the load. This increases the running costs significantly in large drives. ( 10 scores )
5. A great amount of effort is necessary to maintain an electric power supply within the requirements of the various types of customers served. Large investments are necessary, and continuing advancements in methods must be made as loads steadily increase from year to year. Some of the requirements for electric power supply are recognized by most consumers, such as proper voltage, availability of power on demand, reliability, and reasonable cost. Other characteristics, such as frequency, wave shape, and phase balance, are seldom recognized by the customer but are given constant attention by the utility power engineers. ( 10 scores )
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