11春学期《电工学》在线作业一答案
11春学期《电工学》在线作业一一、单选题：
1. 戴维南定理的等效电路是由( )构或的。 （满分：4）
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">电压源和入端电阻并联</span>
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">电压源和入端电阻串联</span>
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>
2. i=l0Sin(314t十45°)A，i的角频率为( )rad/s。 （满分：4）
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 </span>
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 </span>
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>
3. 电动机的额定功率PN是指( )的功率。 （满分：4）
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">电源输入电机</span>
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">电机轴头输出 </span>
C. <p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">其它<span lang="EN-US"><o:p></o:p></span></font></span></p>
4. 一电路元件的电压U=10KV，电流I=1mA，电压和电流为非关联方向。则该元件输出的电功率为( ) （满分：4）
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"><span style="mso-spacerun: yes"></span>10</span><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">瓦特</span>
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">-10</span><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">瓦特</span>
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>
5. 1毫享电感两端的电流i为正弦波，其有效值为1安培，初相位为45度，当电感两端电压u与电流i方向关联时u初相位为( )度 （满分：4）
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">135</span>
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</span>
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>
6. 戴维南定理的等效电路是由( )构或的。 （满分：4）
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">电压源和入端电阻并联</span>
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">电压源和入端电阻串联</span>
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>
7. 当一个40欧姆的电阻和一个30欧姆的感抗并联，其等效复阻抗Z为的模为 ( ) 欧姆 （满分：4）
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 </span>
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">24</span>
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>
8. 异步电动机的额定转矩TN表示电机在( )的转矩。 （满分：4）
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">额定工作时</span>
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">任何时候</span>
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>
9. 电动机的额定电流IN是指电机额定工作时( ) 的电流。 （满分：4）
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</span>
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</span>
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>
10. i=20Sin(314t十145°)A，i的频率为( ) Hz。 （满分：4）
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 </span>
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</span>
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>
二、多选题：
1. 当电阻元件的电流和电压是关联方向时，该元件吸收的动率是P=-U2/R。( ) （满分：5）
A. 错误
B. 正确
2. 热继电器是一种用于时间控制的继电器。( ) （满分：5）
A. 错误
B. 正确
3. 复导纳Y=G+jB中的G和Y应该是并联关系。( ) （满分：5）
A. 错误
B. 正确
4. 或门表示只有当输入A和B全是1时，输出F才为1。( ) （满分：5）
A. 错误
B. 正确
5. 与非门表示只有当输入A和B全是1时，输出F才为0。( ) （满分：5）
A. 错误
B. 正确
6. 异步电功机启动时转速为零，转差率为1。( ) （满分：5）
A. 错误
B. 正确
7. 放大电路的电压放大倍数是指在交流通道中，输出电压与输入电压的比值。( ) （满分：5）
A. 错误
B. 正确
8. 晶体管工作在放大区，发射结处于正向偏置、集电结处于反向偏置，晶体管集电极电流等于电流放大系数乘于基极电流。( ) （满分：5）
A. 错误
B. 正确
9. 异步电功机的转速接近同步转速时，转差率接近为零。( ) （满分：5）
A. 错误
B. 正确
10. 电压源和电阻并联，可以用电流源和电阻串联等效。( ) （满分：5）
A. 错误
B. 正确
11. 当电阻元件的电流I和电压U是关联方向时，该元件吸收的动率是P=-UI。( ) （满分：5）
A. 错误
B. 正确
12. 当电流I和电压U是关联方向时，电阻R的电压与电流关系是U=RI 。( ) （满分：5）
A. 错误
B. 正确
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