20春学期《直流自动控制系统》在线平时作业1

adminhan

<p><img height="464" width="669" alt="" src="http://file.open.com.cn/ItemDB/106723/76999fb7-cc55-4922-828f-0ebb71a56354/2012229205249523.png" />&nbsp;</p>
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt">A</p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt">B</p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt">C</p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt">D</p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在双闭环调速系统中，</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ASR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">的输出限幅值为</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(&nbsp; )。</span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">最小</span><img height="16" alt="" width="17" src="file:///C:/DOCUME~1/Rockwell/LOCALS~1/Temp/ksohtml/wps_clip_image-18511.png" /><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">角给定值</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">最大转速给定值</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">最大电流给定值</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">最小电流给定值</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在调磁调速时，为了提升转速，我们可以（&nbsp; ）。</span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">增大电动机反电势</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">降低电动机反电势</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">增大电动机磁通</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">降低电动机磁通</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;普通逻辑无环流（既无推<font face="Times New Roman">b</font><font face="宋体">又无准备）可逆调速系统中换向时待工作组投入工作时，电动机处于（</font><font face="Times New Roman"> </font><font face="宋体">）状态。</font></span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">回馈制动</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">反接制动</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">能耗制动</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">自由停车</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速电流双闭环调速系统中转速调节器的英文缩写是（</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">）</span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ACR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"> </span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">AVR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"> </span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ASR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"> </span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ATR</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在双闭环直流调速系统的启动建流阶段，如果电流环响应过快，电枢电流急剧上升，为了保护电机，我们可以增加一个</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">( )</span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速变化率环</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">激磁电流环</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电枢电压环</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电流变化率环</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在带转速微分负反馈的调速系统中，减小超调量可以调节</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">( )</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p></o:p></span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速反馈系数</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速微分滤波时间常数</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速调节器积分时间常数</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">转速微分时间常数</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">对称三阶典型系统的办法的超调量交大，如此大的超调量一般是不能满足工艺要求的。限制系统超调量的办法几种？（</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"> </span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">）</span></p><p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 150%"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">①给定积分器</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;&nbsp;</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&nbsp;②引入微分环节&nbsp;&nbsp;&nbsp;③加给定滤波器</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><o:p></o:p></span></p><p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><!--EndFragment--></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">①</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">③</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">①</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">②</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">②③</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">①</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">②③</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">以下情况所产生的环流成为直流环流（<font face="Times New Roman"> </font><font face="宋体">）</font></span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">两组晶闸管同时工作在逆变状态</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">一组晶闸管工作在整流状态，另一组晶闸管工作在逆变状态，但整流电压平均值大于逆变电压平均值</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">一组晶闸管工作在整流状态，另一组晶闸管工作在逆变状态，但整流电压平均值小于逆变电压平均值</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">一组晶闸管工作在整流状态，另一组晶闸管工作在逆变状态，当整流侧瞬时电压大于逆变侧瞬时电压时产生的环流</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电压负反馈主要补偿</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">______</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">上电压的损耗。</span></p><!--EndFragment-->
A:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电抗器电阻</span></p><!--EndFragment-->
B:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电源内阻</span></p><!--EndFragment-->
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电枢电阻</span></p><!--EndFragment-->
D:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">以上皆不正确</span></p><!--EndFragment-->

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 12pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">逻辑无环流可逆调速系统任何时候都不会出现两组晶闸管同时封锁的情况</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">工程设计方法中所谓</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">I</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">型典型系统（二阶典型系统），其开环传递函数为</span><img height="47" width="122" alt="" src="http://file.open.com.cn/ItemDB/106723/f2164161-711b-4cb7-803f-257c9c8785ac/201762714925809.png" /></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">晶闸管变流装置相比较于直流斩波器，其电网功率因素要高一些</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电流调节器输入</span><img height="26" width="22" alt="" src="file:///C:/DOCUME~1/Rockwell/LOCALS~1/Temp/ksohtml/wps_clip_image-17910.png" /><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">的极性为</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">(</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">负</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">)</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">，电流调节器输出</span><img height="24" width="24" alt="" src="file:///C:/DOCUME~1/Rockwell/LOCALS~1/Temp/ksohtml/wps_clip_image-1835.png" /><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">的极性为负。</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span class="15" style="FONT-SIZE: 10pt; BACKGROUND: rgb(255,255,255); COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'; mso-shading: rgb(255,255,255)">设计双闭环系统时，一般是先内环后外环，调节器的结构和参数取决于稳态精度和动态校正的要求。</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">逻辑无环流系统就是当一组晶闸管工作时，用逻辑电路封锁另一组晶闸管的触发脉冲，使该组晶闸管完全处于阻断状态，从根本上切断环流通路</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">减小系统超调量的做法一般有加给定积分器、加给定滤波器和引入微分反馈三种方式</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">直流电机启动过程的转速超调与调节阶段，其特点是转速超调，使</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ASR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">退出（饱和）限幅，</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ASR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">和</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">ACR</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">同时发挥调节作用，速度环的调节作用是主导的，电流环是随动的，它的作用是使</span><span style="FONT-SIZE: 10.5pt; FONT-STYLE: italic; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">U</span><span style="FONT-SIZE: 10.5pt; VERTICAL-ALIGN: sub; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">i</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">跟随</span><span style="FONT-SIZE: 10.5pt; FONT-STYLE: italic; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">U</span><span style="FONT-SIZE: 10.5pt; VERTICAL-ALIGN: sub; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">i</span><span style="FONT-SIZE: 10.5pt; VERTICAL-ALIGN: super; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">*</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">变化</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">调磁调速就是在保持电动机端电压为额定值的情况下，通过减弱电动机的磁场进行调速度。</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">独立励磁控制系统，其磁场回路采用磁场电流反馈单闭环控制，由另外一个电位器作为激磁电流给定</span></p><!--EndFragment-->
A:错误
B:正确