题28图所示倍压整流电路中，设 https://assets.asklib.com/psource/2015110209560813071.jpg ，U0约为（）。 https://assets.asklib.com/psource/2015110209562890066.jpg

A . 2 B . 3 C . 1 D . 0

A . A B . B C . C D . D

A . A、1个 B . B、2个 C . C、3个 D . D、4个

A . A、4个 B . B、2个 C . C、3个 D . D、5个

A . 9 B . 10 C . 12 D . 14.14

A . A B . B C . C D . D

A . 1 B . -1 C . 1.5 D . -1.5

A . VD-高压硅堆、μA-微安表 B . A、B-T2高压侧的两个端点 C . J-脱扣线圈、V-电压表 D . S1、S2-开关 E . C-脉冲电容器、T1-调压器 F . R1、R2-限流保护电阻、T2-高压试验变压器

<img src='https://img2.soutiyun.com/ask/2020-08-20/966779467520788.png' />

<img src='https://img2.soutiyun.com/ask/2020-10-09/971112968507991.png' /> <img src='https://img2.soutiyun.com/ask/2020-10-09/971112900716113.jpg' />

单相半波整流电路如图所示，已知变压器副边电压为u(t)=28.28sin(ωt+ψ)V，设D为理想二极管，直流电压表的读数最接近于()。 <img src='https://img2.soutiyun.com/shangxueba/ask/3591001-3594000/3593876/ct_jggysbnjxj_jggysbnjxchoose_0426(106).jpg' /> A．28.28V B．20V C．9V D．16.33V

<img src='https://img2.soutiyun.com/ask/2020-10-10/9711752938202.jpg' />

<img src='https://img2.soutiyun.com/ask/uploadfile/5406001-5409000/c630e547205761d766a5a68bcf02d8c6.png' />

求图所示电路的微分方程。设输入为u₁(t)，输出为u₂(t)。 <img src='https://img2.soutiyun.com/ask/5523001-5526000/d863126170088b2673c4380cb6743e8b.jpg' />

A．200kΩ B．300kΩ C．600kΩ D．1500K

题8-16图所示电路中<img src='https://img2.soutiyun.com/ask/2020-09-02/967908620890949.png' />。求电压<img src='https://img2.soutiyun.com/ask/2020-09-02/967908643298231.png' />。 <img src='https://img2.soutiyun.com/ask/2020-09-02/967908658092077.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-24/983009831097799.png' />

分析图NP1-28所示桥式整流电路。(1)当V₂=20V时，估算输出整流电压V_O值，设ωC_LR_L=10，R_s/R_L=0.05;(2)D₁开路时，对输出电压V_O有何影响？(3)D₂极性接反会发生什么现象？ <img src='https://img2.soutiyun.com/ask/2021-02-24/983009778890813.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/17868001-17871000/17868863/2015110209404832241.jpg' /> A．1 B． -1 C． 2 D． -2

题3.17图所示电路中，<img src='https://img2.soutiyun.com/ask/2020-12-29/978113884423556.png' />，用叠加定理求i。 <img src='https://img2.soutiyun.com/ask/2020-12-29/97811390074849.png' />

题7-2图所示各电路中开关S在t=0时动作，试求各电路在t=0，时刻的电压电流。已知题7-2图(d)中的<img src='https://img2.soutiyun.com/ask/2020-08-24/96707702037258.png' />。 <img src='https://img2.soutiyun.com/ask/2020-08-24/96707704860863.png' />