【单选题】【消耗次数:1】
当稳压管在正常稳压工作时,其两端施加的外部电压的特点为( )。
反向偏置但不击穿
正向偏置但不击穿
反向偏置且被击穿
参考答案:
复制
纠错
相关题目
【单选题】 某只硅稳压管的稳定电压Vz = 4v,其两端施加的电压分别为+5v(正向偏置)和-5v(反向偏置)时,稳压管两端的最终电压分别为( )。
①  5v和-5v
②  -5v和+4v
③  +0.7v和-4v
【判断题】 半导体二极管工作在反向击穿区时,即使流过管子的电流变化很大,管子两端的电压变化也很小,利用这种特性可以做成稳压管。
①  正确
②  错误
【判断题】 稳定二极管稳压时是处于正向偏置状态。
①  正确
②  错误
【判断题】 电子调节器中稳压管被击穿时,其大功率晶体管一定处于导通状态。()
①  正确
②  错误
【判断题】 稳压二极管的反向击穿特性曲线很陡,说明它的动态电阻rZ越小,它的稳压性能越好。
①  正确
②  错误
【单选题】 如果PN结反向电压的数值增大(小于击穿电压),则()。
①  阻当层不变,反向电流基本不变。
②  阻当层变厚,反向电流基本不变。
③  阻当层变窄,反向电流增大。
④  阻当层变厚,反向电流减小。
【判断题】 电子调节器中稳压管被击穿时,其大功率三极管一定处于导通状态。()
①  正确
②  错误
【判断题】 PN结反向偏置时,PN结的内电场增强。
①  正确
②  错误
【判断题】 发射结正向偏置,集电结正向偏置,则三极管处于饱和状态。
①  正确
②  错误
【单选题】 稳压二极管是利用其工作在伏安特性的( )状态,电压变化极小的特性,使两端电压得以稳定。
①  反向截止
②  反向击穿
③  正向导通
④  正向或反向
随机题目
【单选题】 The desegregation was achieved through a number of struggles, _____been mentioned in previous chapters.
①  a few of which
②  a few of them
③  a few of those
④  a few of that
【单选题】 人们在一定的认识基础上确立的、对某种思想或事物坚信不疑并身体力行的态度是()。
①  信念
②  理想
③  情感
④  意志
【单选题】 He was totally not aware when the thief _____ his wallet from him.
①  tricked
②  stole
③  robbed
④  deceived
【单选题】 You _____business interfering with my affairs.
①  have none
②  have no
③  have none of the
④  have nothing like
【单选题】 _____is announced in the papers, our country has launched a large scale movement against smuggling and fraudulent activities in foreign currency exchange deals.
①  What
②  As
③  Which
④  That
【单选题】 The board deemed it’s urgent that these invitations _____first thing tomorrow morning.
①  had to be put in the mail
②  must be put in the mail
③  be put in the mail
④  should have been put in the mail
【单选题】 Once _____, this power station will supply all the neighboring towns and villages with electricity.
①  it being completed
②  it completed
③  completed
④  it completes
【单选题】 An emergency _____ is very important in case of fire.
①  exit
②  deposit
③  discharge
④  elaborate
【单选题】 They saw a new movie at the theatre, _____ they had dinner at a Chinese restaurant.
①  then which
②  which after
③  after which
④  after that
【单选题】 Both sides agree to establish a _____ zone between the south and north.
①  midst
②  mild
③  mention
④  neutral