20春学期《电工电子技术及应用》在线平时作业3

adminhan

<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">时间继电器是一种过载保护电器。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">相量是描述正弦波的复数。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font face="宋体"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma">对称三相电路的</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">三角形电阻</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma">负载</span></font><span style="LINE-HEIGHT: 150%; FONT-FAMILY: &quot;Tahoma&quot;,&quot;sans-serif&quot;; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'" lang="EN-US">R</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma"><font face="宋体">为</font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: &quot;Tahoma&quot;,&quot;sans-serif&quot;; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'" lang="EN-US">20</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma"><font face="宋体">欧，电源线电压有效值为</font></span><span style="LINE-HEIGHT: 150%; FONT-FAMILY: &quot;Tahoma&quot;,&quot;sans-serif&quot;; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'" lang="EN-US">380V</span><font face="宋体"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma">。</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">负载相</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-ascii-font-family: Tahoma">电流有效值</span><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">为<span lang="EN-US">11A</span>。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></span></font></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">磁动势一定时磁路的磁阻越大，磁路中的磁通就越小。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p><p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p><font face="宋体">&nbsp;</font></o:p></span></p>
A:错误
B:正确

<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">刀开关是用来接通或分断电路的手动电器<span style="text-shadow: auto">。</span></span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></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-hansi-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-US; mso-fareast-language: ZH-CN; mso-bidi-language: AR-SA; mso-bidi-font-size: 10.5pt; mso-text-raise: -3.0pt">节点电位法是以节点电位为变量，根据<span lang="EN-US">KVL</span>列出电路方程来求解的方法。</span>
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">本征半导体掺入五价元素后空穴数目大量增加，空穴导电成为这种半导体的主要导电方式，称为空穴半导体或<span lang="EN-US"> P</span>型半导体。（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>）</span>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">多个复阻抗串联时，总阻抗<span lang="EN-US">Z=Z₁+Z₂+Z₃+</span>&hellip;。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">异步电功机的转速接近同步转速时，转差率接近为零</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></span></font></p><p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt" lang="EN-US"><o:p><font face="宋体">&nbsp;</font></o:p></span></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有效值的代数和等于零。（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>）</span>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">换路定律指出换路瞬间电压不跳变，即<span lang="EN-US">u(0₊)=u(0_-)(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">热</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">继电器是一种过载保护电器。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">异步电功机启动时转速为零，转差率也为零</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt"><font face="宋体">改变三相异步电动机的磁极对数可以实现调速。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp; </span><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;</span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">电动机额定效率是电机轴上输出机械功率与定子输入电功率的比值。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p><p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p><font face="宋体">&nbsp;</font></o:p></span></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">电流源和电压源并联，可以用电压源和电阻串联等效。</span>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">Z=j50</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt">欧姆，表明该电路为纯电感电路。（<span lang="EN-US"><span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span></span>）<span lang="EN-US"><o:p></o:p></span></span></font></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">当电流和电压是非关联方向时，电阻的电压与电流关系是<span lang="EN-US">U=RI </span>。</span>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">三角形联接的三相电路可以是三线制也可以是四线制。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="TEXT-ALIGN: left; LINE-HEIGHT: 20pt; TEXT-INDENT: -30pt; MARGIN: 0cm 0cm 0pt 30pt; mso-line-height-rule: exactly; mso-pagination: widow-orphan; mso-char-indent-count: -2.5" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; mso-bidi-font-weight: bold; mso-font-kerning: 12.0pt">输入电阻是表明放大电路从信号源吸取电流大小的参数。电路的输入电阻愈大，从信号源取得的电流愈小，同时在输入端上的分压越大，使输出电压增加。</span><span style="POSITION: relative; LAYOUT-GRID-MODE: both; DISPLAY: none; FONT-SIZE: 12pt; TOP: 0pt; mso-hansi-font-family: 宋体; mso-text-raise: 0pt; mso-font-kerning: 12.0pt; mso-hide: all" lang="EN-US"><o:p></o:p></span></font></p><p style="LINE-HEIGHT: 20pt; MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char; mso-line-height-rule: exactly" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt; mso-bidi-font-weight: bold; mso-font-kerning: 12.0pt" lang="EN-US"><font face="宋体">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></font></span></p>
A:错误
B:正确

<p style="TEXT-ALIGN: left; LINE-HEIGHT: 20pt; TEXT-INDENT: -30pt; MARGIN: 0cm 0cm 0pt 30pt; mso-line-height-rule: exactly; mso-pagination: widow-orphan; mso-char-indent-count: -2.5" class="MsoNormal" align="left"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt; mso-hansi-font-family: 'Courier New'; mso-bidi-font-weight: bold; mso-font-kerning: 12.0pt"><font face="宋体">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。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p>
A:错误
B:正确

<p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt"><font face="宋体">换路定律指出换路瞬间电感电流不跳变，即<span lang="EN-US">i_L(0₊)=i_L(0_-)(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></span></p><p style="MARGIN: 0cm 0cm 0pt" class="MsoNormal"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p><font face="宋体">&nbsp;</font></o:p></span></p>
A:错误
B:正确

<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt; text-shadow: auto">熔断器</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">是一种当用电设备发生短路故障时能自动切断电路的短路保护电器</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt; mso-hansi-font-family: Tahoma; mso-ascii-font-family: Tahoma">。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p><p style="LINE-HEIGHT: 150%; MARGIN: 0cm 0cm 0pt; LAYOUT-GRID-MODE: char" class="MsoNormal"><span style="LINE-HEIGHT: 150%; FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US"><o:p><font face="宋体">&nbsp;</font></o:p></span></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">热</span><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">继电器是一种用于时间控制的继电器。<span lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)</span></span>
A:错误
B:正确

<p style="TEXT-ALIGN: left; MARGIN: 0cm 0cm 0pt; mso-pagination: widow-orphan" class="MsoNormal" align="left"><font face="宋体"><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 16.0pt; text-shadow: auto">按钮</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 14.0pt">是用于接通和断开控制电路的手动切换电器。</span><span style="FONT-SIZE: 12pt; mso-bidi-font-size: 10.5pt" lang="EN-US">(<span style="mso-spacerun: yes">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; </span>)<o:p></o:p></span></font></p>
A:错误
B:正确