【单选题】
9-8 图示电路,开关S原打开,电路已达稳态,t=0时开关S闭合,则t0时的电容电压uc(t)= ,电感电流iL(t)= 。<img src=https://huaweicloudobs.ahjxjy.cn/0A9C8B5D213E97BC4EEE747FA07B154F.jpg title=9-8.jpg alt=9-8.jpg/>
①
<img class=jc-formula data-tex=100-50{ e }^{ -200t }V,1-0.5{ e }^{ -200t }A src=https://huaweicloudobs.ahjxjy.cn/07CE0885BF01EC41D4B74934D9DF8D0B.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=100-50{ e }^{ 200t }V,1-0.5{ e }^{ 200t }A src=https://huaweicloudobs.ahjxjy.cn/390AA18F0C343EEDC22BEBC01A6DA9B5.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=100+50{ e }^{ -200t }V,1+0.5{ e }^{ -200t }A src=https://huaweicloudobs.ahjxjy.cn/8B43598B68276D95C2AFE7EAAF065FA7.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=100+50{ e }^{ 200t }V,1+0.5{ e }^{ 200t }A src=https://huaweicloudobs.ahjxjy.cn/674B2986B9A63D1A5CF9E2746281C89E.png style=vertical-align: middle;/>
【单选题】
8-7 在计算图示电路过渡过程中的i,uR,uL时,所使用的时间常数<img class=jc-formula data-tex=\tau src=https://huaweicloudobs.ahjxjy.cn/2CD7B56839A80551EEDD7D4015B0FE37.png style=vertical-align: middle;/>值为 。<img src=https://huaweicloudobs.ahjxjy.cn/8913A8EB37379C4DB93DAC93061599F8.jpg title=8-7.jpg alt=8-7.jpg/>
【单选题】
9-7 已知电感电流iL(0-)=1A,图示电感电路的运算阻抗是 ,附加电压源是 。<img src=https://huaweicloudobs.ahjxjy.cn/43BF1004BBDC5A515D564FCD30A107EE.jpg title=9-7.jpg alt=9-7.jpg width=163 height=54 style=width: 163px; height: 54px;/>
①
<img class=jc-formula data-tex=2S,-\frac { 1 }{ S } src=https://huaweicloudobs.ahjxjy.cn/EA537CF0AFF5B18CD700E695DD06327E.png style=vertical-align: middle;/>
②
<img class=jc-formula data-tex=2S,-2 src=https://huaweicloudobs.ahjxjy.cn/425A725BFAB7B5D268496976D35D4A44.png style=vertical-align: middle;/>
③
<img class=jc-formula data-tex=\frac { 1 }{ 2S } ,-\frac { 1 }{ S } src=https://huaweicloudobs.ahjxjy.cn/DEACF0884263C5E30FC810BB6C9CF53A.png style=vertical-align: middle;/>
④
<img class=jc-formula data-tex=\frac { 1 }{ 2S } ,-2 src=https://huaweicloudobs.ahjxjy.cn/106D202EA81C49A645002F2D55F0E23A.png style=vertical-align: middle;/>
【单选题】
<img title=无标题518.jpg alt=无标题518.jpg src=https://huaweicloudobs.ahjxjy.cn/24BC6FB0BE5E3597CD12D0153DD1C95B.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/2D05853C76815C7CF7E22682632CB17E.png data-tex={ n }_{ 1 }=1\quad ,\quad { n }_{ 2 }=3\quad ,\quad { P }_{ max }=20W/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/FDFC60BECA9CC39363CAA5B0B5E848E4.png data-tex={ n }_{ 1 }=0.5\quad ,\quad { n }_{ 2 }=2\quad ,\quad { P }_{ max }=20W/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/131433945D09038AF269E1A5275736DE.png data-tex={ n }_{ 1 }=0.5\quad ,\quad { n }_{ 2 }=3\quad ,\quad { P }_{ max }=20W/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/439B923F6E5E50275D1774039E0461F3.png data-tex={ n }_{ 1 }=0.5\quad ,\quad { n }_{ 2 }=3\quad ,\quad { P }_{ max }=10W/>
【单选题】
<img title=无标题417.jpg alt=无标题417.jpg src=https://huaweicloudobs.ahjxjy.cn/3C8C33825C525C3909845A7ADAD98762.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/96549CE1F66A72FC71857F65B2064550.png data-tex=\dot { { U }_{ C } } =22.36\angle { -63.45 }^{ 0 }V\quad ,\quad \dot { { I }_{ 1 } } =5\angle { 53.1 }^{ 0 }A\quad ,\quad \quad \dot { { I }_{ 2 } } =-5\sqrt { 2 } \angle { 8.1 }^{ 0 }A/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/33EF9120DD52B1802F531C0B0427B092.png data-tex=\dot { { U }_{ C } } =22.36\angle { -63.45 }^{ 0 }V\quad ,\quad \dot { { I }_{ 1 } } =-5\angle { 53.1 }^{ 0 }A\quad ,\quad \quad \dot { { I }_{ 2 } } =-5\sqrt { 2 } \angle { 8.1 }^{ 0 }A/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/66E63DC73B03D3683D6E649DBD0F4DEC.png data-tex=\dot { { U }_{ C } } =22.36\angle { -63.45 }^{ 0 }V\quad ,\quad \dot { { I }_{ 1 } } =5\angle { 53.1 }^{ 0 }A\quad ,\quad \quad \dot { { I }_{ 2 } } =5\sqrt { 2 } \angle { 8.1 }^{ 0 }A/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/1B0CC7824E4E369D6B1848814659A0AC.png data-tex=\dot { { U }_{ C } } =22.36\angle { -63.45 }^{ 0 }V\quad ,\quad \dot { { I }_{ 1 } } =5\sqrt { 2 } \angle { 53.1 }^{ 0 }A\quad ,\quad \quad \dot { { I }_{ 2 } } =-5\angle { 8.1 }^{ 0 }A/>
【单选题】
<img title=无标题51.jpg alt=无标题51.jpg src=https://huaweicloudobs.ahjxjy.cn/0251D83C45A416CD7471540F7BA95E29.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/3541324779CB2E2324F918A4176E489C.png data-tex={ u }_{ 1 }={ L }_{ 1 }\frac { d{ i }_{ 1 } }{ dt } +M\frac { d{ i }_{ 2 } }{ dt } \\ { u }_{ 2 }={ L }_{ 2 }\frac { d{ i }_{ 2 } }{ dt } +M\frac { d{ i }_{ 1 } }{ dt } />
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/1C2553866C1758912E84F5BB8CC2C143.png data-tex={ u }_{ 1 }={ L }_{ 1 }\frac { d{ i }_{ 1 } }{ dt } +M\frac { d{ i }_{ 1 } }{ dt } \\ { u }_{ 2 }={ L }_{ 2 }\frac { d{ i }_{ 2 } }{ dt } +M\frac { d{ i }_{ 2} }{ dt } />
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/D0867A802BF3EEAD0AF1B2DA98635E75.png data-tex={ u }_{ 1 }={ L }_{ 1 }\frac { d{ i }_{ 2 } }{ dt } +M\frac { d{ i }_{ 1 } }{ dt } \\ { u }_{ 2 }={ L }_{ 2 }\frac { d{ i }_{ 2 } }{ dt } +M\frac { d{ i }_{ 1 } }{ dt } />
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/DF5F5CA162C4A650D65C23C31464B4E1.png data-tex={ u }_{ 1 }={ L }_{ 1 }\frac { d{ i }_{ 1 } }{ dt } +M\frac { d{ i }_{ 2 } }{ dt } \\ { u }_{ 2 }={ L }_{ 2 }\frac { d{ i }_{ 1 } }{ dt } +M\frac { d{ i }_{ 2 } }{ dt } />
【单选题】
<img title=无标题510.jpg alt=无标题510.jpg src=https://huaweicloudobs.ahjxjy.cn/A39E160380B82FC26AD5BD65F42C96E2.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/1F81EC0518938BA76A80E3EBFB772D2E.png data-tex=[{ R }_{ 1 }+j\omega ({ L }_{ 1 }-M)+{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 2 } } =\dot { { U }_{ 1 } } \\ -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } +[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)+R+j\omega M-j\frac { 1 }{ \omega C } ]\dot { { I }_{ 2 } } =0/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/1665B2B92A716A59AA7889FFB2C22DAF.png data-tex=[{ R }_{ 1 }+j\omega ({ L }_{ 1 }-M)+{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 2 } } =\dot { { U }_{ 1 } } \\ -[{ R }_{ 1 }+j\omega ({ L }_{ 1 }-M)]\dot { { I }_{ 1 } } +[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)+R+j\omega M-j\frac { 1 }{ \omega C } ]\dot { { I }_{ 2 } } =0/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/A0C5575497B6B2297F7D95C9E867756D.png data-tex=[{ R }_{ 1 }+j\omega ({ L }_{ 1 }-M)+{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 2 } } =\dot { { U }_{ 1 } } \\ -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } +[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)+R+j\omega M+j\frac { 1 }{ \omega C } ]\dot { { I }_{ 2 } } =0/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/8F29A9FCFFFB39EE813F2A0F49FB7469.png data-tex=[{ R }_{ 1 }+j\omega ({ L }_{ 1 }-M)+{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 1 } } -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 2 } } =\dot { { U }_{ 1 } } \\ -[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)]\dot { { I }_{ 2 } } +[{ R }_{ 2 }+j\omega ({ L }_{ 2 }-M)+R+j\omega M-j\frac { 1 }{ \omega C } ]\dot { { I }_{ 21} } =0/>
【单选题】
<img title=无标题44.jpg alt=无标题44.jpg src=https://huaweicloudobs.ahjxjy.cn/222B871269010B4A027124A6229482B4.jpg/>
①
u<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/A61758EB2BFA56FBDC2CD01AAE14098A.png data-tex=u=90\sqrt { 2 } sin(314t-{ 8.7 }^{ 0 })V/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/5D0D1204DE0E549B99F93C6F4AB03E93.png data-tex=u=64\sqrt { 2 } sin(314t-{ 8.7 }^{ 0 })V/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/058C7EE5BFE4A559626CC50BACBD52EB.png data-tex=u=64\sqrt { 2 } sin(50t-{ 8.7 }^{ 0 })V/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/CEA2F282D0CAB1DE63C7939C72ED6695.png data-tex=u=64\sqrt { 2 } sin(314t-{30}^{ 0 })V/>
【单选题】
<img title=无标题65.jpg alt=无标题65.jpg src=https://huaweicloudobs.ahjxjy.cn/90D0778C7889A7A063EE28D339BD280C.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/A33618F57A0BFEDDEEAFC91D2E7059CC.png data-tex={ U }_{ l }=416.3V/>
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/13AE67CF84BAC20C550079E89CE305D9.png data-tex={ U }_{ l }=461.3V/>
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/E1341C93714922B632DEBCE4313CF8C6.png data-tex={ U }_{ l }=400V/>
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/3E1091706B8F7374BA8BE14B1FEDF956.png data-tex={ U }_{ l }=358.2V/>
【单选题】
<img title=无标题54.jpg alt=无标题54.jpg src=https://huaweicloudobs.ahjxjy.cn/7F0622F95531F92809AE5B24931DBDF7.jpg/>
①
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/F28D6C1790C478882B49B794CEEED3B8.png data-tex=\dot { { U }_{ OC } } =10\angle { 0 }^{ 0 }V,{ Z }_{ eq }=(3+j7.5)\Omega />
②
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/FD6E39099501DC0CDCAA0EF923B677D1.png data-tex=\dot { { U }_{ OC } } =15\angle { 0 }^{ 0 }V,{ Z }_{ eq }=(7.5+j3)\Omega />
③
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/20B80DAC0CB9863EAB2AFB4CA7AB06AC.png data-tex=\dot { { U }_{ OC } } =15\angle { 0 }^{ 0 }V,{ Z }_{ eq }=(3+j7.5)\Omega />
④
<img class=jc-formula style=vertical-align: middle; src=https://huaweicloudobs.ahjxjy.cn/6DA2D6FD6AE82E90AE1FC737940BD7BA.png data-tex=\dot { { U }_{ OC } } =15\angle { 0 }^{ 0 }V,{ Z }_{ eq }=(3-j7.5)\Omega />