题目内容
一台发电机最大输出功率为4000kW,电压为4000V,经变压器
升压后向远方输电。输电线路总电阻
.到目的地经变压器
降压,负载为多个正常发光的灯泡(220V、60W)。若在输电线路上消耗的功率为发电机输出功率的10%,变压器
和
的耗损可忽略,发电机处于满负荷工作状态,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113657771207.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113657787315.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113657802207.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113657771207.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113657802207.gif)
A.![]() ![]() |
B.![]() ![]() |
C.![]() ![]() |
D.有![]() |
ABD
输电线路上消耗的功率为P=400kW=I2R可知输电线上电流为I2=20A,根据原线圈P1=U1I1,可知I1=
,A对,
的变压比为I2:I1=1:50;根据P=U2I2,可知U2=2×
V,输电线上电压U线=I2R=20000V,则副线圈输入电压为U3=U2-U线=
,又灯泡正常发光、副线圈电压为220V,B对,
的变压比为U3:U4=
:220,C错;根据U3I2=60n,解得n=
,D对。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658114477.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658146276.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658161359.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658177623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658192298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658208527.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824113658426481.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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