Friday, September 16, 2022
根据晶体管的输出特性曲线,不是晶体管的工作状态的是()...
Friday, September 16, 2022
Friday, September 16, 2022
绕线式异步电动机转子串频敏变阻器启动时,随着转速的升高,()自动...
Friday, September 16, 2022
Friday, September 16, 2022
电工测量方法中,将被测量与标准量进行比较,来确定被测量大小的是(...
Friday, September 16, 2022
Monday, September 12, 2022
为了方便,母线排列应有一定的顺序。一般垂直布置的母线()三相由上...
Friday, September 16, 2022
同步发电机的转子型式有两种,一般汽轮发电机为显极式转子,水轮发电...
Friday, September 16, 2022
在启动电动机时,发现电动机发出嗡嗡声,且不能转动,请说明可能是什...
Friday, September 16, 2022
三相半波可控整流电路大电感负载有续流管的控制角α移相范围是0~9...
Friday, September 16, 2022
带有电流载止负反馈环节的调速系统,为了使电流载止负反馈参与调节后...
Friday, September 16, 2022
负反馈放大电路产生高频自激振荡的原因是()。A、多级放大器的附加相移大B、电源存在内阻C、信号源存在内阻D、负载太重...
Tuesday, December 26, 2023
Friday, September 16, 2022
Friday, September 16, 2022
为了减少触点的接触电阻和提高耐磨性,紫铜片上镀焊银基合金多用于(...
Wednesday, September 14, 2022
关断晶闸管(GTO)构成高性能的变速调速系统。但目前由于元件的制...
Monday, September 12, 2022
Monday, September 12, 2022
三相半波可控整流电阻性负载电路中,每一个晶闸管的最大导通角是()...
Monday, September 12, 2022
Friday, September 16, 2022