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单选题在直流稳态时,电容元件上( )

A. 有电压,有电流

B. 有电压,无电流

C. 无电压,有电流

D. 无电压,无电流

电工电子技术基础课程封面

学科：电工电子技术基础

时间：2024-11-15 06:19:44

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在直流稳态时,电感元件上( )

A. 有电流,有电压B. 有电流,无电压C. 无电流,有电压D. 无电流,无电压

在换路瞬间,下列各项中除( )不能跃变外,其他全可跃变

A. 电感电压B. 电容电流C. 电阻电压D. 电感中储存的能量

如图所示电路开关S闭合前电路已处于稳态,试问闭合开关瞬间,初始值<img src="https://p.ananas.chaoxing.com/star3/origin/34cb279a2ca1adf775cd2707411d6b22.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/f8816356a1af434581666b46ecb55af8.png">分别为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/b8ba1495ec534dfa9f6ba90532e52729.png">

A. 0A,1.5AB. 3A, 3AC. 3A, 1.5AD. 1.5A, 3A

图3-2-11所示电路开关S闭合前电容元件和电感元件均未能储能,试问开关闭合瞬间发生跃变的是( ).<img src="https://p.ananas.chaoxing.com/star3/origin/b9eed01ca085604c44588c32a329d181.png">图3-2-11

A. <img src="https://p.ananas.chaoxing.com/star3/origin/afb72cfbe0cc60a2155d30e6f2efe2d5.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">B. <img src="https://p.ananas.chaoxing.com/star3/origin/afb72cfbe0cc60a2155d30e6f2efe2d5.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/eca18f111ef3e6021a5feaafaab9b2da.png">C. <img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/7fc7c47bf126784aaa48165bb97e5cc1.png">D. <img src="https://p.ananas.chaoxing.com/star3/origin/afb72cfbe0cc60a2155d30e6f2efe2d5.png">和<img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">

图3-2-20所示电路换路前处于稳定状态,在t=0时开关突然断开则i(0+)为( ). <img src="https://p.ananas.chaoxing.com/star3/origin/7bed6ad6d5d1b181b001fb4d6ab3ea25.png">图3-2-20

A. 1AB. 0AC. 1.5AD. 0.5A

在直流稳态时,电容元件上( )

A. 有电压,有电流B. 有电压,无电流C. 无电压,有电流D. 无电压,无电流

图3-2-10所示电力开关S闭合前电路已处于稳态,试问闭合开关瞬间,电流初始值<img src="https://p.ananas.chaoxing.com/star3/origin/dce6951d1d2f5d6d387eaa00e818dcf5.png">为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/2c5b8eb7004c2b164db53528c3a64dbd.png">图3-2-10

A. 1AB. 0.8AC. 0AD. 0.4A

图3-2-12所示电路开关S闭合前电路已处于稳态.当开关闭合后各电流状况为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/9fbb90eb46c2f51ba23f559699f2ff04.jpg">图3-2-12

A. <img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">、<img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">、<img src="https://p.ananas.chaoxing.com/star3/origin/ac88849e5d54840d34c1c1c46670f4f1.png">均不变B. <img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">不变、<img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">增长为<img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">、<img src="https://p.ananas.chaoxing.com/star3/origin/ac88849e5d54840d34c1c1c46670f4f1.png">衰减为零C. <img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">增长、<img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">增长、<img src="https://p.ananas.chaoxing.com/star3/origin/ac88849e5d54840d34c1c1c46670f4f1.png">不变D. <img src="https://p.ananas.chaoxing.com/star3/origin/4ea23aca206d61fe7242d4410186cd61.png">、<img src="https://p.ananas.chaoxing.com/star3/origin/43660a17dcf9111723a3ccd29d51bf58.png">、<img src="https://p.ananas.chaoxing.com/star3/origin/ac88849e5d54840d34c1c1c46670f4f1.png">均增长

图3-2-14所示电路在换路前处于稳定状态,在t=0瞬间将开关S闭合,则iC(0+)为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/950adfb074d05e2f82a642fd53622f71.png">图3-2-14

A. 0.6AB. 0AC. 0.3AD. -0.6A

图3-2-16所示电路在换路前处于稳定状态,在<img src="https://p.ananas.chaoxing.com/star3/origin/248fe25f2d66cc7077d02bb8943d1051.png">时闭合开关,则开关闭合瞬间电容的电压为( ).<img src="https://p.ananas.chaoxing.com/star3/origin/6c583e0fdae8f4d18f257878e48c518a.png">图3-2-16

A. 0.2VB. 1VC. 0.8VD. 1.2V

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