20春学期《电工学》在线平时作业1

adminhan · 发表于 2020-8-8 19:00:48

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">i=l0Sin(314t<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">十45<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: Symbol; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-ascii-font-family: 宋体; mso-fareast-font-family: 宋体; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">°<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">)A<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">，i的角频率为(      )rad/s。
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">50 
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">314 
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US"> 8<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">毫享电感两端的电流i为正弦波，其有效值为2安培，角频率为1000rad/s，当电感两端电压u与电流i方向关联时u有效值为(      )伏 
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">8000 
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">16
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">100<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">微法电容电感两端的电流i为正弦波，其有效值为5安培，初相位为0度，当电感两端电压u与电流i方向关联时u初相位为(      )度
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">-90
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">90  
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">异步电动机的最大转矩Tm表示电机(       )的能力。
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">抗负载的冲击
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">带负载启动
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

10毫享电感两端的电流i=5 A，当电感两端电压u与电流i方向关联时u为(      )伏 <o:p></o:p>
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">0 
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">50
C:其它<o:p></o:p>

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">星形连结的对称三相电路，线电压=220V，则相电压为(      )V。
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">127 
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">380
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">220

电动机的额定电流IN是指电机额定工作时(       ) 的电流。<o:p></o:p>
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">定子绕组
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">转子端
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">当一个60欧姆的电阻和一个80欧姆的容抗串联，其等效复阻抗Z的模为 (         ) 欧姆.
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">140
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">100
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

i=20Sin(314t十145<span style="FONT-FAMILY: Symbol; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-ascii-font-family: 宋体; mso-char-type: symbol; mso-symbol-font-family: Symbol" lang="EN-US">°)A，i的频率为(      ) Hz。<o:p></o:p>
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">50 
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">314
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">异步电动机的转差率s等于(       )。
A:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">(n0-n)/n0
B:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US"> n0-n
C:<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">其它

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 14.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; text-shadow: auto">熔断器<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 14.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">是是一种热过载保护电器。<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA" lang="EN-US">(      )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">相量反映了正弦量的大小和初相位。(         )
A:错误
B:正确

时间继电器是一种过载保护电器。(      )<o:p></o:p>
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">正弦交流电路流入结点的电流的相量和等于零。（       ）<o:p></o:p>
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">直流电源作用的一阶电路稳态时，电感可以看作短路。(          )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">换路定律指出换路瞬间iL(0+)=iL(0-)(         )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">当电阻元件R的电流I和电压U是非关联方向时，该元件输出的动率是P=-I2R。(        )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电流源和电阻串联，可以用电压源和电阻并联等效。(        )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 14.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-weight: bold">稳压管反向击穿后，电流变化很大，但其两端电压变化很小，电压降低后原特性恢复。利用此特性，稳压管在电路中可起稳压作用。（         ）
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电流源和电阻并联，可以用电压源和电阻串联等效。(        )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">星形联接的三相电路可以是三线制也可以是四线制。(         )
A:错误
B:正确

<span style="POSITION: relative; LAYOUT-GRID-MODE: line; FONT-FAMILY: 宋体; COLOR: black; FONT-SIZE: 12pt; TOP: 3pt; mso-bidi-font-size: 10.5pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-text-raise: -3.0pt; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA">电压源和电阻串联，可以用电流源和电阻并联等效。(        )
A:错误
B:正确

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20春学期《电工学》在线平时作业1

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