20春学期《电路原理》在线平时作业1

adminhan · 发表于 2020-8-8 19:00:53

<div>图中，<span>L=20mH, C=50pF, R=1k</span><span>W</span>, Ù=10<span>Ð</span>0<sup>0</sup> V。求电路的电流<span>I为 (<span>      ) mA </span>。</span></div><div>A I=<span>¥</span><sup><span>   </span></sup><span>      B I=10       C </span>其它</div><div></div><div><img height="102" width="134" alt="" src="http://file.open.com.cn/ItemDB/88702/d0c3fdc0-4970-4faf-a570-0ff90e197461/201112793159643.JPG" /></div>
A:A
B:B
C:C
D:D

<div>如图空心变压器的输出的特性方程为<span>(<span>      )</span>。</span></div><div>A u<sub>2</sub>=L<sub>1</sub>(di<sub>2</sub>/dt)-M(di<sub>1</sub>/dt),     B u<sub>2</sub>=L<sub>2</sub>(di<sub>2</sub>/dt)-M(di1<sub>2</sub>/dt),     C 其它</div><div></div><div><img style="WIDTH: 171px; HEIGHT: 115px" height="415" width="643" alt="" src="http://file.open.com.cn/ItemDB/88702/948c67ff-494d-4ffe-8e60-223e65cade26/201112791947501.JPG" /></div>
A:A
B:B
C:C
D:D

<div align="left">图中所示为矩形脉冲，试求其象函数<span>F（S）为（<span>      </span>）。</span></div><div align="left"> </div><div>A (1/S)(1-e<sup>-St0</sup>)<span>                  B 1/S                    C</span>其它</div><div><img height="131" width="170" alt="" src="http://file.open.com.cn/ItemDB/88702/beae6112-d65a-4803-86a2-cfbbfdf7f427/201112992615295.JPG" /></div>
A:A
B:B
C:C
D:D

<div>图中，<span>L=20mH, C=50pF, R=1k</span><span>W</span>, Ù=10<span>Ð</span>0<sup>0</sup> V。电路的谐振频率<span>w</span><sub>0</sub>为<span>(<span>       )</span>弧度/秒。</span></div><div>A 10<sup>6<span>   </span>其它</sup>      B 159155       C </div><div></div><div><img height="102" width="134" alt="" src="http://file.open.com.cn/ItemDB/88702/bff4af68-3902-4a41-9709-bb8b45d899c1/201112792625588.JPG" /></div>
A:A
B:B
C:C
D:D

<div>图中，<span>L=10</span><span>m</span>H，<span>C=10</span><span>m</span>F，Ù=1<span>Ð</span>0<sup>0</sup> V。电路的电容电流有效值<span>I<sub>C</sub>为(<span>      )</span>安。</span></div><div>A 10<sup>5<span>   </span>其它</sup>      B 0       C </div><div></div><div><img height="181" width="194" alt="" src="http://file.open.com.cn/ItemDB/88702/49688dad-52fa-409b-babc-30f228b1e1f1/201112792527836.JPG" /></div>
A:A
B:B
C:C
D:D

<div align="left">电流表<span>A</span><sub>1</sub>的读数为<span>5A， A</span><sub>2</sub>为<span>20A， A</span><sub>3</sub>为<span>25A，电流表A</span><sub>4</sub>的读数为<span>45A 。（<span>      </span>）</span></div><div align="left"><span></span></div><div align="left"><span><img height="183" width="333" alt="" src="http://file.open.com.cn/ItemDB/88702/6cc1e6a6-bda7-4f8b-8b9d-2f36eaafe58d/2011126923513.JPG" /></span></div>
A:错误
B:正确

<div align="left">电路如图所示， <span>t<0</span>时电路已达稳态，t=0时开关<span>Ｋ由①扳向②，电压</span>u<sub>C</sub>(0)=4V 。<span>(<span>      )</span></span></div><div align="left"><span><span><img height="205" width="372" alt="" src="http://file.open.com.cn/ItemDB/88702/75efb68a-b38b-4dde-9318-da1e3269f61b/2011128112922153.JPG" /></span></span></div>
A:错误
B:正确

<div>星形联接的三相电路可以是三线制也可以是四线制。<span>(<span>         )</span></span></div>
A:错误
B:正确

<p>己知：<span>U</span><sub>S</sub>=10V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则<span>a点的电位</span>U<sub>a</sub>=-1V。<span>(<span>         )</span></span></p><p><span><span><img style="WIDTH: 137px; HEIGHT: 106px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/c57e38a7-fab8-4309-8e5e-533dffb10b3d/2011124152259876.JPG" /></span></span></p>
A:错误
B:正确

<div>复阻抗<span>Z的阻抗角反映了Z两端的电压和电流的相位差。(<span>        )</span></span></div>
A:错误
B:正确

正弦电路的平均功率P=UIcosj。(         )
A:错误
B:正确

<div>串联谐振时，电感电压和电容电压相等<span>U<sub>L</sub>=U<sub>C</sub>，外加电压等于电阻电压U=U<sub>R</sub>。(<span>        )</span></span></div>
A:错误
B:正确

<div align="left">图中<span> R</span><sub>1</sub>=6Ω, R<sub>2</sub>=4 Ω, R<sub>3</sub>=3 Ω, U<sub>S1</sub>=12V, U<sub>S2</sub>=24V。则电流I<sub>2</sub>=-6A.(<span>      )</span></div><div align="left"><span></span></div><div align="left"><span><img style="WIDTH: 249px; HEIGHT: 148px" height="177" width="344" alt="" src="http://file.open.com.cn/ItemDB/88702/11c37e79-b1ac-4015-bf4b-1955888dafca/2011124153745232.JPG" /></span></div>
A:错误
B:正确

<div align="left">F(S)=(S+8)/[S(S+2)<sup>2</sup>]的原函数f(t)=[2-(2+3t)e<sup>-2t</sup>]1(t)（<span><span>      </span>）。</span></div><div align="left"> </div>
A:错误
B:正确

<div align="left">电路中的开关断开已经很久，<em>t</em>=0时闭合开关，电压u<sub>1</sub>(0)=1V 。(<span>      )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/cea2c96b-f8e4-4cba-8353-2fbf7514ea1b/2011128112757104.JPG" /></div>
A:错误
B:正确

<div>并联谐振是含有电感和电容的电路中的复导纳<span>Y的虚部G=0时产生的。(<span>        )</span></span></div>
A:错误
B:正确

<div align="left">图中<span> U</span><sub>S</sub>=-10V, R=10Ω, I<sub>S</sub>=1A。则电压源输出的电功率为<span>10W。(<span>      )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/7c2b430d-2879-4ed1-9203-04a315deac76/201112415514742.JPG" /></span></span></div>
A:错误
B:正确

<p>R=15Ω, <span>L=0.3mH, C=0.2mF,U=5V,f=3*</span>10<sup>4</sup>Hz .电压U<sub>C</sub>=3.95V <sub> </sub>。（<span><span>    </span>）</span></p><p><span></span></p><p><span><img alt="" width="255" height="166" src="http://file.open.com.cn/ItemDB/88702/261464b7-1261-4404-9895-e659518cfe55/2011126989304.JPG" /></span></p>
A:错误
B:正确

<div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=1A。则电流源输出的电功率为<span>20W。(<span>      )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/d707cb7e-58f2-4abb-951e-12c7e6d05d1f/2011124155236855.JPG" /></span></span></div>
A:错误
B:正确

<div align="left">图中<span> U</span><sub>S</sub>=10V, R=10Ω, I<sub>S</sub>=-1A。则电压<span>U=0V 。(<span>       )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="255" alt="" src="http://file.open.com.cn/ItemDB/88702/640b4b05-1d11-44a5-9d3e-e304477ff20d/201112415499864.JPG" /></span></span></div>
A:错误
B:正确

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20春学期《电路原理》在线平时作业1

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