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【单选题】
8×51的定时器,在下列哪种方式下具有自动加载功能?___
A. Mode0
B. Mode1
C. Mode2
D. Mode3
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答案
C
解析
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【单选题】
45下列哪种AD转换器的转换速度比较快?___
A. 双斜率型AD转换器
B. 比较型AD转换器
C. 连续计数式AD转换器
D. 逐渐接近式AD转换器
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46下列哪种AD转换器的精密度比较高?___
A. 双斜率型AD转换器
B. 比较型AD转换器
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D. 逐步逼近式AD转换器
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47对于8×8 LED点阵而言,其中的LED个数及引脚各为多少?___
A. 64、16
B. 16、16
C. 64、12
D. 32、12
【单选题】
48在共阳极型8×8 LED点阵里,其阳极如何连接?___
A. 各行阳极连接到行引脚
B. 各列阳极连接到列引脚
C. 各行阳极连接到列引脚
D. 各列阳极连接到行引脚
【单选题】
49在共阳极型8×8 LED点阵里,其阴极如何连接?___
A. 各行阴极连接到行引脚
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C. 各行阴极连接到列引脚
D. 各列阴极连接到行引脚
【单选题】
50双色8×8 LED点阵的列引脚与行引脚各位多少?___
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___的方向规定由高电位点指向低电位点。
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三相电动势到达最大的顺序是不同的,这种达到最大值的先后次序,称三相电源的相序,相序为U-V-W-U,称为___。
A. 正序
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电路的作用是实现能量的传输和转换、信号的___和处理。
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电阻器反映导体对电流起阻碍作用的大小,简称___。
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___反映了在不含电源的一段电路中,电流与这段电路两端的电压及电阻的关系。
A. 欧姆定律
B. 楞次定律
C. 部分电路欧姆定律
D. 全欧姆定律
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并联电路中的总电流等于各电阻中的___。
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串联电路中流过每个电阻的电流都___。
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___的一端连在电路中的一点,另一端也同时连在另一点,使每个电阻两端都承受相同的电压,这种联结方式叫电阻的并联。
A. 两个相同电阻
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C. 几个相同大小的电阻
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【单选题】
___的电阻首尾依次相连,中间无分支的联结方式叫电阻的串联。
A. 两个或两个以上
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电流流过负载时,负载将电能转换成___。
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电功的数学表达式不正确的是___。
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测量电压时,电压表应与被测电路___。
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测量电流时,万用表的接线方法与直流电流表一样,应把万用表___在电路中。测量直流电压时,应把万用表与被测电路并联。
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串联电路中各电阻两端电压的关系是___。
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确定正弦量的三要素为 ___。
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纯电容元件在电路中___电能。
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当电压为5V时,导体的电阻值为5欧,那么当电阻两端电压为2V时,电阻值为___欧。
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对称负载接成星形时,三相总电流___。
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一段有源支路如图1所示,AB两端的电压UAB为___。
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【单选题】
如图2电路中,等效电阻=___
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在R、L、C串联电路中,已知=3Ω,=5Ω,=8Ω,则电路的性质为 ___。
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工业生产中大量的设备均为感性负载,功率因数往往很低,常采取___的方法来提高电网的功率因数。
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交流电压表及电流表指示的数值是___
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RLC串联电路发生谐振,,R=10Ω,Ω,则谐振时的感抗为___
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RL从电路获得最大功率,此时RL=___。
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使用电解电容时___。
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开关接1时,电压表的读数为___。
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开关接2时,电流表的电流为___。
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开关接1时,电流表中流过的短路电流为___。
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电感两端的电压相位超前电流___。
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电容两端的电压相位滞后电流___。
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