在图6-11所示洛普霍夫减速器中,已知z₁=z₄=z₇=101,z₂=z₃=z₅=z₆=z₈=z₉=100,z_2´=z₅_´=z₈_´=99,求传动比i_AB.

<img src='https://img2.soutiyun.com/ask/2020-12-31/978258141219365.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-24/980354994671936.png' />

在图4.4.1(a)和(b)所示的互补对称电路中，已知Vcc=6V，R_L=8Ω，假设三极管的饱和管压降U_CES=1V。 ①试估算电路的最大输出功率P_om; ②估算电路中直流电源消耗的功率P_V和效率η。 并将两个电路的估算结果进行比较。 <img src='https://img2.soutiyun.com/ask/2020-09-10/968622476866462.png' />

在图3-23所示的电路中，已知<img src='https://img2.soutiyun.com/ask/2020-11-14/974192768614519.png' />试求I₃。 <img src='https://img2.soutiyun.com/ask/2020-11-14/974192781086232.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-21/980070260607023.jpg' />

在图3.17所示电路中，已知R=2Ω，Z₁=-j10Ω，Z₂=(40+j30)Q，<img src='https://img2.soutiyun.com/ask/2020-12-15/976893137697925.png' /><img src='https://img2.soutiyun.com/ask/2020-12-15/976893148823561.png' /> <img src='https://img2.soutiyun.com/ask/2020-12-15/976893181116408.png' />

在图5-2-3所示轮系中，已知<img src='https://img2.soutiyun.com/ask/2021-01-24/980354250160352.png' />若n₁=500r/min，求齿条6线速度v的大小和方向。 <img src='https://img2.soutiyun.com/ask/2021-01-24/980354261270988.png' />

<img src='https://img2.soutiyun.com/ask/2020-08-27/967387796675757.png' />

在图9-1所示机构中,已知:x=250mm,y=200mm,l_AS2=128mm,F为驱动力,Q为有效阻力.m₁=m₃=2.75kg,m₂=4.59kg,Js₂=0.0l2kg·m²,又原动件3以等速v=5m/s向下移动,试确定作用在各构件上的惯性力. <img src='https://img2.soutiyun.com/ask/2020-12-31/978270790835882.png' />

在图LP4-69所示的共集电极电路中,已知晶体三极管在I_CQ=2mA时的参数为r_bb=50Ω,<img src='https://img2.soutiyun.com/ask/2020-10-26/97255806712955.png' />试求高频电压传递函数<img src='https://img2.soutiyun.com/ask/2020-10-26/972558082050404.png' />的表示式. <img src='https://img2.soutiyun.com/ask/2020-10-26/972558092714014.png' />

①试估算电压放大倍数和 <img src='https://img2.soutiyun.com/ask/2020-09-10/968621949195281.png' />输入、输出电阻R_i、R₀; ②如果不接旁路电容Ca，则=？ <img src='https://img2.soutiyun.com/ask/2020-09-10/968621959958897.png' />

<img src='https://img2.soutiyun.com/shangxueba/ask/18987001-18990000/18989931/2016071910353680984.gif' /><img src='https://img2.soutiyun.com/shangxueba/ask/18987001-18990000/18989931/2016071910354280288.jpg' /> A．A B． B C． C D． D

在图NP2-17(a)所示的T型匹配网络中，已知输出负载电阻为R_L，放大器要求的匹配阻抗为R_e。 <img src='https://img2.soutiyun.com/ask/2021-02-24/983011823810775.png' /> <img src='https://img2.soutiyun.com/ask/2021-02-24/983011845538018.png' />

<img src='https://img2.soutiyun.com/ask/2021-02-26/983184210538544.png' />

在图2-16所示结构中,已知个构件的长度,构件1以角速度<img src='https://img2.soutiyun.com/ask/2020-12-29/978113751128932.png' />₁逆时针方向回转.现已给出求受解机构在图示位置时构件5上E点的速度v_E的速度多边形图.试写出求解v_E的过程.(包括求解时所用的矢量方程式,各量的方向及大小的表达式) <img src='https://img2.soutiyun.com/ask/2020-12-29/978114330770086.png' />

(1)最大输出功率P_om和效率ƞ各为多少？ (2)晶体管的最大功耗P_Tmax为多少？ (3)为了使输出功率达到P_om,输入电压的有效值约为多少？ <img src='https://img2.soutiyun.com/ask/2021-01-09/97906063889348.png' /> 图p9.2

<img src='https://img2.soutiyun.com/ask/2021-01-24/980354437823086.png' />

在图2-20(a)所示的采煤康拜因的钻探机构中,已知l_BC=280mm,l_AB=840mm,l_AD=1300mm,<img src='https://img2.soutiyun.com/ask/2020-12-29/978109089372295.png' />=15°及等角速度<img src='https://img2.soutiyun.com/ask/2020-12-29/978108997649048.png' />21=1rad/s,求点C、D的速度和加速度 <img src='https://img2.soutiyun.com/ask/2020-12-29/978110205055108.png' />

在图2-13所示的五杆机构中,已知各构件尺寸(尺寸比例尺u₁=0.001m/mm)和<img src='https://img2.soutiyun.com/ask/2020-12-29/978113751128932.png' />₁、<img src='https://img2.soutiyun.com/ask/2020-12-29/978113751128932.png' />₄的大小和方向.试用作图法分析构件2的角速度<img src='https://img2.soutiyun.com/ask/2020-12-29/978113751128932.png' />₂和角加速度<img src='https://img2.soutiyun.com/ask/2020-12-29/978114214119414.png' />₂. <img src='https://img2.soutiyun.com/ask/2020-12-29/978114010615774.png' />

<img src='https://img2.soutiyun.com/ask/2021-01-09/979039518243448.png' />

<img src='https://img2.soutiyun.com/ask/2021-03-02/983551408663457.png' />

已知题9-14图所示电路中的电压源为正弦量，L=ImH，R₀=1kΩ，Z=(3+j5)Ω。试求： <img src='https://img2.soutiyun.com/ask/2020-09-04/96807621414959.png' /> (1)i₀=0时，C值为多少？ (2)当条件(1)满足时，试证明输入阻抗为R₀。

<img src='https://img2.soutiyun.com/ask/2020-12-31/978258248213485.png' />