电路原理X21春东大《电路原理》在线平时作业1百分
电路原理X21春学期《电路原理》在线平时作业11.[单选题] <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>
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A.A
B.B
C.C
D.D
答:——A——
2.[单选题] <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
答:——A——
3.[单选题] <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
答:——A——
4.[单选题] <div align="left">图中所示电路<span>C=0.1F,R=10</span><span>Ω</span>,求冲击响应<span>i为(<span> </span>) </span>。</div><div align="left"> </div><div>A 0.1<span>d</span>(t)-0.1e<sup>-t</sup>1(t)A<span> B -0.1e<sup>-t</sup>1(t)A C</span>其它</div><div><img alt="" width="202" height="122" src="http://file.open.com.cn/ItemDB/88702/312bac90-d018-482a-b489-7ba3ba1b438b/201112992414229.JPG" /></div>
A.A
B.B
C.C
D.D
答:————
5.[单选题] <div>电路图中的时间常数为<span>(<span> )</span>。</span></div><div>A <span>t</span> =10<sup>-5 </sup><span> B </span><span>t</span> =10<span> C </span>其它</div><div><img height="243" width="355" alt="" src="http://file.open.com.cn/ItemDB/88702/02433072-a314-4d1b-942d-93e6604c7afa/2011128111550830.JPG" /></div>
A.A
B.B
C.C
D.D
答:————
6.[判断题] 正弦交流电的感抗和容抗都与频率成正比。( )
A.错误
B.正确
答:———— 更多答案进 ap5u.com 福师q164786 1640
7.[判断题] <div>图中复阻抗<span>Y=1/R+1/(j</span><span>w</span>L)+j<span>w</span>C。<span>(<span> )</span></span></div><div><span><span></span></span></div><div><span><span><img height="226" width="420" alt="" src="http://file.open.com.cn/ItemDB/88702/8899879a-b6bf-49e6-ac99-4269159bccdb/20111269119293.JPG" /></span></span></div>
A.错误
B.正确
答:————
8.[判断题] <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
答:————
9.[判断题] <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,电流i<sub>2</sub>(0)=5 mA 。(<span> )</span></div><div align="left"> <img height="179" width="347" alt="" src="http://file.open.com.cn/ItemDB/88702/815ee736-079b-46b2-987d-abbb1d04aaf5/2011128112255516.JPG" /></div>
A.错误
B.正确
答:————
10.[判断题] <p>己知:<span>U</span>S=10V,R3=1Ω,R1=2Ω,R2=7Ω. 则<span>b点的电位</span>U<sub>b</sub>=9V。<span>(<span> )</span></span></p><p><span><span><img style="WIDTH: 137px; HEIGHT: 101px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/e1633de7-d212-4961-828c-60e376985789/2011124152526506.JPG" /></span></span></p>
A.错误
B.正确
答:————
11.[判断题] <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>L</sub>(0)=-1V 。(<span> )</span></div><div align="left"> <img height="156" width="324" alt="" src="http://file.open.com.cn/ItemDB/88702/c35d6bfa-e893-4f0e-8265-3aecf92e1169/2011128112838464.JPG" /></div>
A.错误
B.正确
答:————
12.[判断题] 正弦电路的无功功率Q=UISinj。( )
A.错误
B.正确
答:————
13.[判断题] <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
答:————
14.[判断题] <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>bc</sub>=-6V。<span>(<span> )</span></span></div><div><span><span></span></span></div><div><span><span><img style="WIDTH: 158px; HEIGHT: 122px" height="209" width="254" alt="" src="http://file.open.com.cn/ItemDB/88702/48f8324a-3ff0-47c7-af67-6aebaae8a542/2011124153147424.JPG" /></span></span></div>
A.错误
B.正确
答:————
15.[判断题] <div align="left">图中<span>I<sub>5</sub>=4A</span>。<span>(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="240" width="413" alt="" src="http://file.open.com.cn/ItemDB/88702/99613fe3-714d-4b85-8c84-cb7d4df59523/2011125103351702.JPG" /></span></span></div>
A.错误
B.正确
答:————
16.[判断题] <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
答:————
17.[判断题] <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。则电阻<span>R<sub>3</sub>消耗的电功率为48W。(<span> )</span></span></div><div align="left"><span><span></span></span></div><div align="left"><span><span><img height="177" width="344" alt="" src="http://file.open.com.cn/ItemDB/88702/3439ff72-0b70-465f-b7d8-fca4daf2dd52/2011124154345650.JPG" /></span></span></div>
A.错误
B.正确
答:————
18.[判断题] 复阻抗Z的模反映了Z两端的电压和电流的有效值之比。( )
A.错误
B.正确
答:————
19.[判断题] <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)=0V 。<span>(<span> )</span></span></div><div align="left"><span><span><img height="205" width="372" alt="" src="http://file.open.com.cn/ItemDB/88702/cf71e4d9-887a-45fc-9513-a9591e2532fd/2011128113057141.JPG" /></span></span></div>
A.错误
B.正确
答:————
20.[判断题] <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,电流i<sub>1</sub>(0)=5 mA 。(<span> )</span></div><div align="left"> <img height="179" width="347" alt="" src="http://file.open.com.cn/ItemDB/88702/83e3c5e9-bd24-4bc3-9f7e-029eebd7b9fe/201112811225561.JPG" /></div>
A.错误
B.正确
答:————
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