20春学期《电路原理》在线平时作业3

adminhan · 发表于 2020-8-8 19:00:53

<div>图中<span>t</span><span>³</span>0时<span>i<sub>L</sub>(t) 为(<span>      )</span>。</span></div><div>A i<sub>L</sub>(t)=3e<sup>-4t </sup><span>    B i<sub>L</sub>(t)=3-3e<sup>-4t</sup>    C </span>其它</div><div><img height="214" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/9fc324a9-266f-4a36-8cf1-c0cea1adc304/201112811174784.JPG" /></div>
A:A
B:B
C:C
D:D

<div>如图理想变压器的电压方程为<span>(<span>     )</span>。</span></div><div>A u<sub>1</sub>=nu<sub>2 </sub>,<span>         B u<sub>1</sub>=-nu<sub>2 </sub>,       C </span>其它</div><div></div><div><img style="WIDTH: 194px; HEIGHT: 106px" height="226" width="369" alt="" src="http://file.open.com.cn/ItemDB/88702/270dd319-379b-4e2d-949d-517aad98b68a/201112792128815.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>如图理想变压器的电流方程为<span>(<span>      )</span>。</span></div><div>A i<sub>1</sub>=ni<sub>2 </sub>,<span>         B i<sub>1</sub>=-(1/n)i<sub>2 </sub>,       C </span>其它</div><div><img style="WIDTH: 246px; HEIGHT: 117px" height="226" width="369" alt="" src="http://file.open.com.cn/ItemDB/88702/99c1e4db-2dd5-4327-81b3-2a82391fa84f/20111279233270.JPG" /></div><div></div>
A:A
B:B
C:C
D:D

<div>图中<span>t</span><span>³</span>0时<span>u<sub>c</sub>(t)为(<span>      )</span>。</span></div><div>A u(t)=12e<sup>-0.25t </sup><span>    B u(t)=12-12e<sup>-0.25t</sup>    C </span>其它</div><div><img height="227" width="314" alt="" src="http://file.open.com.cn/ItemDB/88702/919e2371-76e2-479e-aca1-ad80c7ff1b91/20111281118398.JPG" /></div>
A:A
B:B
C:C
D:D

<div align="left">图示电路，t=0 时将开关<span>K闭合</span>，<span>t<0</span>时电路已达稳态，电压u<sub>c</sub>(0)=10V 。<span>(<span>      )</span></span></div><div align="left"> <img height="179" width="347" alt="" src="http://file.open.com.cn/ItemDB/88702/8ba5edc6-2187-486e-bace-7b153849ee21/201112811255551.JPG" /></div>
A:错误
B:正确

<div>理想变压器具有变电压功能，<span>U<sub>1</sub>与U<sub>2</sub>之比等于匝数比n<sup>2</sup>。(<span>          )</span></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>R</sub>(0)=4V 的初始值。<span>(<span>      )</span></span></div><div align="left"><span><span><img height="205" width="372" alt="" src="http://file.open.com.cn/ItemDB/88702/3879c225-0e2d-4d90-957b-e8389238c2d9/201112811306967.JPG" /></span></span></div>
A:错误
B:正确

<div>滤波器是利用电感和电容的频率特性实现滤掉某些频率波形的设备。<span>(<span>         )</span></span></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，电流i<sub>L</sub>(0)=1A 。(<span>      )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/2ac95e58-1679-4890-9afb-ebb5764b985a/201112811278914.JPG" /></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 align="left">已知 R=1Ω, <span>C=1F, a=2</span>。 e(t)=e<sup>-at</sup>1(t)V,时的u<sub>C</sub>(t)=e<sup>-t </sup>1(t)V（<span><span>      </span>）。<img height="122" width="222" alt="" src="http://file.open.com.cn/ItemDB/88702/f155f4eb-0dc1-44f8-864a-dfff8c26ea09/201112993026364.JPG" /></span></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，电流i<sub>1</sub>(0)=1A 。(<span>      )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/32b0cb26-3083-436e-b92c-78d3fe8431db/2011128112628710.JPG" /></div>
A:错误
B:正确

<div align="left">图中<span>70V电压源发出的功率P<sub>70</sub>=420W。(<span>      )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="238" width="337" alt="" src="http://file.open.com.cn/ItemDB/88702/cc3ee81b-3448-42e8-b386-73cd494359ba/2011125101518472.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>Z<sub>21</sub>等于双口网络输出端短路时的转移阻抗。<span>(<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。则电流<span>I=1A 。(<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/f412761b-83ab-4bc6-be85-c3dd7607f225/201112415506944.JPG" /></span></span></div>
A:错误
B:正确

<div>己知：<span>U</span>S=30V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则电压U<sub>co</sub>=21V。<span>(<span>       )</span></span></div><div><span><span></span></span></div><div><span><span><img style="WIDTH: 175px; HEIGHT: 132px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/38c9abf6-9781-4137-951b-6753c7366c40/2011124153251161.JPG" /></span></span></div>
A:错误
B:正确

<div>己知：<span>U</span><sub>S</sub>=30V,R<sub>3</sub>=1Ω,R<sub>1</sub>=2Ω,R<sub>2</sub>=7Ω. 则电压U<sub>ab</sub>=-30V。<span>(<span>       )</span></span></div><div><span><span></span></span></div><div><span><span><img style="WIDTH: 170px; HEIGHT: 121px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/f4d32a8c-379b-4db3-8339-6fd0622d9461/2011124153037391.JPG" /></span></span></div>
A:错误
B:正确

  <div>非正弦电路的谐波阻抗是随着谐波的频率不同而变化的。<span>(<span>          )</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3

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