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电工与电子技术习题(下)解答1-1答:输出电压波形如图1-1所示。1-2答:输出电压波形如图1-2所示。1-3答:D1导通,D2截止,00UV。1-4答:输出电压波形如图1-3所示。1-5答:饱和状态:发射结正偏,集电结正偏;放大状态:发射结正偏,集电结反偏;截止状态:发射结反偏,集电结反偏。1-6答:PNP型锗管,-1V为发射极,-1.3V为基极,-6V为集电极。1-7答:NPN型硅管,4.2V为基极,3.5V为发射极,9.6V为集电极。1-8答:(a)截止状态;(b)放大状态;(c)饱和状态。2-1(1)UB=3V,IE=0.7mA,IC=0.7mA,IB=14μA,UCE=7.25V(2)微变图略(3)Au=-34,(4)ri=5.1K,ro=3K2-2(1)IB=28μA,IC=1.4mA,UCE=8V5v)(0Vut-10v05v)(0Vut010v5v)(0Vut0图1-1题1-1波形图图1-2题1-2波形图图1-3题1-4波形图(2)ri=1.23K(3)微变图略(4),Au=-1012-3(1)UB=3V,IE=1.6mA,IC=1.6mA,IB=32μA,UCE=5.6V(2)微变图略(3)不带负载时的放大倍数Au=-110(4)带负载时的放大倍数Au=-55,2-4(1)IB=44μA,IC=2.64mA,UCE=9.7V(2)Au≈1(3)ri=≡108K,ro=31Ω(4),因为具有电压负反馈作用2-5(1)第一级:UB1=5V,IE1=1.19mA,IC1=1.19mA,IB1=23.8μA,UCE1=9.54V第二级:IB2=24μA,IC2=1.2mA,UCE2=8V(2)微变图略(3)Au1=-11.34,Au2=1,Au=-11.34(4)带负载能力强,输出电压稳定2-6(1)UB1=4V,IE1=1.1mA,Ic1=1.1mA,IB1=22μAUCE1=5.4VIB2=40μAIc2=2mA,UCE2=6V(2)略(3)Au1=-83,Au2=1,Au=-83(4)ri=1.3KΩ(5)ro=77Ω2-7(1)IB1=21.6μAIc1=1.08mA,UCE1=5.46VIB2=39.9μAIc2=2mA,UCE2=5.9V(2)略(3)Au1=-92.7,Au2=1,Au=-92.72-8(1)UB1=5V,IE1=1.1mA,Ic1=1.1mA,IB1=22μAUCE1=6.8VUB2=3.98V,IE2=0.968mA,Ic2=0.968mA,IB2=13.6μAUCE2=7.04V(2)略(3)Au1=-1346,Au2=-5.33,Au=7174(4)ri=1.25KΩ(5)ro=10KΩ3-1uo=11(2/5ui1+3/5ui2)3-2uo=-1/CF∫(ui1/R11+ui2/R12)3-3解见右图3-4uo1=ui(R2/(R1+R2))=4V,uo2=-(RF2/R3)ui=-8V3-5uo=ui1+2ui23-6(1)uo1=2V,uo2=-10t,uo=-5-t(2)t=1Suo=-6Vt=2Suo=-6V2vt(ms)ui(mts)uo1t(ms)uo-4V12V5-3A=0,B=1,C=15-4CPQ3Q2Q100001001201030114100500067逻辑功能:同步五进制加法计数器5-5CPQ3Q2Q100001001201030114100510161107000逻辑功能:异步七进制加法计数器5-6逻辑功能:异步六进制加法计数器CPQ3Q2Q1CPQ3Q2Q1CPQ3Q2Q16-1解:(1)波形图如图6-1所示。(2)9945.020UUV,100LRUIA。6-2解:(1)369.020UUV,1800LRUImA,2.79911.120UIPmW。(2)1845.020UUV,900LRUImA,2.56557.120UIPmW。6-3解:(1)正确。(2)电路为半波整流、电容滤波电路。(3)电源短路。(4)电源短路。6-4解:(1)4.142.120UUV。(2)8.109.020UUV。(3)1220UUV。(4)4.545.020UUV。(5)97.16220UUV。6-5解:(1)302.120UUV,100ZUUV,150LZZDZRURUUImA。(2)2520UUV,∵100LZZDZRURUUImA,ZMDZZIII,∴稳压管能正常工作。6-6解:(1)90LZRUImA,210LZZDZRURUUImA。(2)300RUUIZDZmA,∵ZMDZII,∴稳压管不能正常工作。6-7解:240UV是正常的。(1)280UV时,负载RL开路。(2)200UV时,可能是D1和D3(或D2和D4)中有一只或两只二极管开路,电路为半波整流、电容滤波电路。(3)180UV时,电容开路,电路为无电容滤波的桥式整流电路。(4)90UV时,电容开路,且D1和D3(或D2和D4)中有一只或两只二极管开路,电路为无电容滤波的半波整流电路。6-8解:(1)25.119.020LLRRRUUV。0t0u0i图6-1题6-1波形图(2)152.120LLRRRUUV。(3)162.12LZZDZRURUUImA。(4)252.12RUUIZDZmA,∵ZMDZZIII,∴稳压管能正常工作。7-3102º,12.4A,3CT20/6007-4148V,7.4A,3CT20/6007-5128º7-6Uo=184V,Io=18.4A,可编程控制器的原理和应用2-12-410004100021000110003100050000100001图2-1输入设备编号启动按钮10002停止按钮10001M1热保护10003M2热保护100045秒定时器400013秒定时器40002输出设备编号正向接触器00001反向接触器00002100010000410002100031000400001000130050T0.14000100001000020001300014100030000210004000140030T0.14000200001图2-42-4I/O分配表2-5100010000400004000050000410002()00014000130001500013000150050T0.140001()0080T0.140002()0020T0.14000300004000140001500015000040001300001000130001400002000140000310003100041000500005图2-52-52-6-3输入设备编号启动按钮10002停止按钮10001热保护110003热保护210004热保护310005定时器140001定时器240002定时器340003输出设备编号电动机M100001电动机M200002电动机M3000032-5I/O分配表00013100010001310002000131000300016000141000200001000020001500002100050000100001100040000200014100040100T0.140002()00015100050050T0.140001()00016100040003UCTR40003()0001310004000040001300003图2-610005输入设备编号停止按钮10001启动按钮10002热保护10003行程开关A10004行程开关B10005定时器140001定时器240002计数器40003输出设备编号正向接触器00001反向接触器00002指示灯100003指示灯2000042-6I/O分配表2-62-72-8000130001300014000150050UCTR40003()图2-700013100031000310003VVV00013100021000100014000010050T0.14000210004000010012UCTR40001000140001400015输入设备编号停止按钮10001启动按钮10002热保护1000312次计数器40001定时器4000250次计数器40003000011000210005000020000110001100040000210003100011000400001000020000310007100061000900004100100000300004100081000610009000030000410011图2-8
本文标题:电工与电子技术习题解答(下)
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