武汉大学电路期末试题上200411

武汉大学

电气工程学院

2003—2004学年第一学期考试试题（A）

科目：电路（上）学号：学生姓名：考分

1、电路如图（a）所示，其中R=2Ω，L=1H，C=0.1F，u c(0)=0，若电路的输入电流波形图（b）所示，试求出t>0以后u R、u L、u C的波形。(15分)

2、题2图中（a）、（b）分别为直流电阻电路N1、N2，元件参数如图所示。

（1）、试求出N1、N2的最简单电路；

（2）、若将N1、N2连成图（C）所示的电路，问R L为何值时，消耗的功率最大，此时最大功率为何值。(20分)

3、一个阻感性负载与一个纯阻性负载并联于220V的工频正弦交流电源（f=50Hz），如图（a），所示，纯阻性负载的功率为220W。为求得阻感性负载的参数，设计图（b）所示电路，

所加的电源仍为工频正弦交流，并测得电压表的读数为50V ，电流表的读数为1A ，

功率表

的读数为30W 。

（1） 试由图（b ）求出阻感性负载的参数R 、X L ； （2） 试求出图（a ）中负载端的功率因数；

（3） 如果把图（a ）中负载端的功率因数提高到0.95，应并联多大的电容？

4、三相电路如图所示，第一个功率表

的读数为1666.67W ，第二个功率表

的读数为

833.33W ，试求对称三相感性负载的有功功率、无功功率及功率因数。

5、写出图示电路的回路电流方程。

6、 图示电路中，L 1=8mH ，L 2=0.5H ，R =2Ω，L 3= 0.2H ，R 1=4Ω，U 0=6V ，n=2，

t u s 1000sin 28 ，电流表

的读数为0.6A ，求C 值及电流表的读数。

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精心整理 大学英语（一） 行政班级分级班级姓名学号 C. A measuring system. D. A control system. 2. A. Car prices. B. Car services.

C. The company’s business. D. The company’s culture. 3. A. It’s easy to do. B. It’s challenging. dialogue, there are some recorded questions. Both the conversations and questions will be spoken two times. Conversation 1

6. A. Breakfast. B. Dinner. C. A 5 dollar gift card. D. Bus service to the airport. 10. A. Make an appointment with her. B. Talk with her about a new order.

C. Send her an email about the shipment. D. Call her back when receiving the shipment. Directions: This part is to test your ability to construct grammatically correct sentences. It consists of 2 sections.

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