举一反三
- 如图所示的功率放大电路，若忽略三极管的饱和压降VCES，电源电压为VCC=12V，负载电阻RL=8Ω，则三极管的极限参数V(BR)CEO应满足（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/949cf20edb3149039098f27f2700b11a.png
- 已知f1(t)和f2(t)波形如下，若f(t)=f1(t)*f2(t)，则f(0)=http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/e38151c6fa664a008f547dd1af821f92.bmp
- 电路如图所示，管子在输入信号vi作用下，在一周期内T1和T2轮流导电约180度，电源电压VCC=20V，负载RL=8Ω，在输入信号Vi=10V（有效值）时，电路的直流电源供给的效率为（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/b96ba06b8c8a43288ea323cb73bf3ab9.png
- 信号f1(t)和f2(t)如下图所示，f(t)=f1(t)*f2(t)，则f(-1)等于http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/0749958f4da44655959aea343dbe4d9c.bmp
- 已知f(t)↔F(w)，则下列说法正确的是（） A: tf(t)↔wF(w) B: F(t)↔f(w) C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/e987a05c70d3455bad2fbdef6ce1fc1d.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201812/92f68075a5ff43708660199e4eed9415.png" />
内容
- 0
已知电路如图4所示，若输入信号ui为正弦波，则输出波形为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201804/5b65bf8bacef4037b33fdb27bb9a1fe9.png
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图中，设A为理想运放，R1=5.1kΩ，R2=51kΩ，R3=10kΩ，RL=20Ω，VCC为18V，输入交流信号vi为2sinωt V，分析电路中R2引入何种反馈（）http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/48d08defb63d40499c90e68ec6bc3d3e.png
- 2
逻辑函数F(A,B,C)=AB+BC+AC的卡诺图为（ ）。 A: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/7a8254757f8a4fc6ab82fa93a8e86ebf.png" /> B: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/229cbcade3654fb99c66a7c102ec046f.png" /> C: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/1c851f1288be499c92d2a7b40607bd1a.png" /> D: <img src="http://image.zhihuishu.com/zhs/onlineexam/ueditor/201809/3b385269839a45df9645db71096c2e81.png" />
- 3
电路如图所示，T1和T2管的饱和管压降│UCES│＝3V，VCC＝15V，RL＝8Ω，电路中D1和D2管的作用是消除( )。http://image.zhihuishu.com/zhs/onlineexam/ueditor/201907/748f2ecc5c3b45e483971fd00ef2d4f3.png
- 4
已知信号f(t)的波形如下图所示，则f(6-2t)的波形图为http://image.zhihuishu.com/zhs/onlineexam/ueditor/201906/414e4bc7b0b44f6e8f660e9dd1189014.bmp