在图10-67所示电路中,开关S在位置1的时间常数为τ1,在位置2的时间常数为τ2,τ1和τ2的关系是()。https://assets.asklib.com/psource/201511011403376601.jpg
在如图所示电路中,电路原已达稳态,t=0时开关S打开,则iL(0+)=( )A,时间常数τ=( )s。40febd86d4fddeb88e01c0496c7d877b.png
如图所示,结构EI=常数,A点的竖向位移(向下为正)为:<img src='https://img2.soutiyun.com/ask/6504001-6507000/a3737ab2e7589a20d6c59bca076a4ba8.jpg' />
如图所示对称三相电路中,线电流<img src='https://img2.soutiyun.com/latex/latex.action' />为( )。<img src='https://img2.soutiyun.com/ask/6492001-6495000/c8ac2e9c8d4073ff522922f1c5e8cebd.jpg' />
如图所示电路,其时间常数τ=( )。<img src='https://img2.soutiyun.com/ask/5490001-5493000/33309d00c8c6d7e86d8ebef7a1702869.jpg' />
如图所示一方形贮水箱的左侧壁面上,有一圆柱形盖ABC,为确定作用在ABC盖上的压强合力的垂直分量,计算相应的压力体τ<sub>P</sub>应为<img src='https://img2.soutiyun.com/ask/5103001-5106000/4ff5db1e54a3f61d8ded87849ebbf11c.jpg' />
电路如图2.9所示,输出电阻r<sub>o</sub>为( )。<img src='https://img2.soutiyun.com/ask/5454001-5457000/199c1c419fdceb92112ea7ca48fb17b4.gif' />
如图所示的电路中,已知:US=2V,IS=2A。电流I为()。<img src='https://img2.soutiyun.com/shangxueba/ask/1887001-1890000/1889142/ct_jgzjgysm_jgzjgyschoose_00463(20093).jpg' />
如图所示,正方形ABCD四条边的中点分别为E、F、G、H。问图中一共有多少个三角形?()<img src='https://img2.soutiyun.com/shangxueba/ask/1236001-1239000/1238266/ct_gdxd11z_gdxmaths_00770(20096).jpg' />
一高输入电阻的桥式放大电路如图题2.4.1所示,试写出<img src='https://img2.soutiyun.com/ask/2020-06-28/962201577362116.png' /><img src='https://img2.soutiyun.com/ask/2020-06-28/962201584103502.png' />
电路如图7.10所示,已知<img src='https://img2.soutiyun.com/latex/latex.action' />若晶闸管的控制角α=30°,则其导通角θ为( )。<img src='https://img2.soutiyun.com/ask/5451001-5454000/abde58fa65c361da53e31695df8d7676.gif' />
如图所示对称三相电路,正常时电流表的读数为17.32A,现将开关S断开,问稳态时电流表的读数=( )。<img src='https://img2.soutiyun.com/ask/uploadfile/6492001-6495000/9a189b2503b9f89a59219f1e89239194.png' />
电路如图所示,则输出电压U<sub>o</sub>为:()<img src='https://img2.soutiyun.com/shangxueba/ask/18075001-18078000/18076761/2015102716195119947.jpg' />
图示电路中,N为含源线性电阻网络,其端口伏安特性曲线如图b)所示,其戴维南等效电路参数应为()<img src='https://img2.soutiyun.com/shangxueba/ask/18087001-18090000/18087885/2015102715435057213.jpg' />
OCL功率放大电路如图所示,当u<sub>i</sub>为正半周时,则()。<img src='https://img2.soutiyun.com/shangxueba/ask/18495001-18498000/18497693/2017120818051176898.jpg' />
压差传感器结构如图4-30a所示,传感器接入二极管双T型电路,电路原理示意图如图4-30b所示。已知电源电压U<sub>E</sub>=10V,频率<img src='https://img2.soutiyun.com/ask/2020-07-30/96495025769614.png' />,压差电容<img src='https://img2.soutiyun.com/ask/2020-07-30/964950278067305.png' /><img src='https://img2.soutiyun.com/ask/2020-07-30/964950289233943.png' />。试分析,当压力传感器有压差<img src='https://img2.soutiyun.com/ask/2020-07-30/964950298895496.png' />使电容变化<img src='https://img2.soutiyun.com/ask/2020-07-30/964950306739945.png' />时,一个周期内负载电阻上产生的输出电压U<sub>RL</sub>平均值的大小与方向。
电路如图题9-14所示,若ZL的实部、虚部均能变动,若使ZL获得最大功率,乙应为何值,最大功率是多少?已知<img src='https://img2.soutiyun.com/ask/2020-07-24/964437792988486.png' />。
如图所示电路中R1=R2=R3=R4=300Ω,R5=600Ω,Rab=()。<img src="https://img2.soutiyun.com/shangxueba/askkp/2022-04/15/1094/20220415092844491.png" alt=""/>
如图15-4-33所示的结构,EI=常数,用力矩分配法计算时,分配系数uA1为()。<img src='https://img2.soutiyun.com/1/2021-04-08/986749906182359.png' />
用4位二进制加法计数器74161构成的计数器电路如图所示,则对该计数器应用电路功能描述正确的是()。<img src='https://img2.soutiyun.com/shangxueba/ask/17016001-17019000/17017084/4de6bc8-chaoxing2016-441551.png' />
利用图10-19所示的模拟低通滤波器为原型,设计一个如图10-20所示的二阶SCF电路.给定电路参数为<img src='https://img2.soutiyun.com/ask/2020-12-02/975758707545881.png' />,时钟频率<img src='https://img2.soutiyun.com/ask/2020-12-02/975758722631744.png' />100kHz.
如图15-4-24所示的连续梁上,各杆EI为常数,用力矩分配法计算时B结点的力矩分配系数μBA和固端弯矩MFBA分别为()。<img src='https://img2.soutiyun.com/1/2021-04-08/986749952882776.png' />
反馈放大电路的方框图如图题7.4.3所示,设V1为输入端引人的噪声,V2为基本放大电路内引入的干扰(例如电源干扰),V3为放大电路输出端引入的干扰。放大电路的开环电压增益为<img src='https://img2.soutiyun.com/ask/2020-07-01/962449432709783.jpg' />
如图a所示,光滑直管AB,长l,在水平面内以匀角速w绕铅垂轴0:转动,另有一小球在管内作相对运动。初瞬时,小球在B端,相对速度为<img src='https://img2.soutiyun.com/ask/2021-02-18/9825157549438.png' />指向固定端A。问<img src='https://img2.soutiyun.com/ask/2021-02-18/982515713446426.png' />应为多少,小球恰能达到A端。