20春学期《直流自动控制系统》在线平时作业2

adminhan

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'"><img height="66" width="635" alt="" src="http://file.open.com.cn/ItemDB/106723/569ccebd-5c9e-4122-a5e6-52b74bd48e21/2012229192514746.png" />&nbsp;</span></p><!--EndFragment-->
A:1
B:0
C:<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">1+K</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/（1+K）（K为开环放大倍数）</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'"><img height="191" width="636" alt="" src="http://file.open.com.cn/ItemDB/106723/13b9e405-e3f1-4ca3-b44d-c74af45d4904/2012229203520771.png" />&nbsp;</span><!--EndFragment--></p>
A:<p>A</p>
B:<p>B</p>
C:<p>C</p>
D:<p>D</p>

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; COLOR: rgb(0,0,0); FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在调速系统中，当电流截止负反馈参与系统调节作用时说明调速系统主电路电流______。</span></p><!--EndFragment-->
A:过大
B:过小
C:正常
D:为零

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">双闭环直流调速系统的起动过程中不包括（</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: '宋体'; mso-spacerun: 'yes'">转速调节阶段</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: '宋体'; mso-spacerun: 'yes'">电流上升阶段</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'"></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'">恒流升速阶段</span></p><!--EndFragment-->
D:<span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'"><o:p><p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">电流下降阶段</span></p><p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt; TEXT-INDENT: 21pt; LINE-HEIGHT: 150%"><!--EndFragment--></p><!--EndFragment--></o:p></span>

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">限止电流冲击的最简单方法是采用_____。</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'">转速微分负反馈</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'">电流截止负反馈</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'">电压负反馈</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'">带电流正反馈的电压负反馈</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'">&alpha;<font face="Times New Roman">=</font><font face="宋体">&beta;配合控制有环流可逆调速系统的主回路中（</font><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'">既有直流环流又有脉动环流</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'">有直流环流但无脉动环流</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'">既无直流环流又无脉动环流</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'">无直流环流但有脉动环流</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'"><img height="102" width="599" alt="" src="http://file.open.com.cn/ItemDB/106723/5a80c6eb-db90-4180-a2cd-9a3e60dcd6af/2012229203827558.png" />&nbsp;</span></p><!--EndFragment-->
A:<p>A</p>
B:<p>B</p>
C:<p>C</p>
D:<p>D</p>

<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'">速度单闭环系统中，不能抑制</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'">的扰动。</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'">调节器放大倍数</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">&nbsp;</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'">电网电压波动</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'">负载</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'">测速机励磁电流</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'">电压负反馈自动调速系统，当负载增加时，则电动机转速下降，从而引起电枢回路</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><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'">端电压增加</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'">端电压不变</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'">电流增加</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'">电流减小</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'">可控直流电源一般有旋转变流机组、静止可控整流器、直流斩波器或脉宽调制变换器</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">3</span><span style="FONT-SIZE: 10.5pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">种</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'">旋转变流机组是通过改变励磁电流大小，改变直流发电机的电压大小，进而调节直流电机的速度</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'">可逆调速系统准确地讲，应该是能够改变直流电动机电磁转矩方向的调速系统</span></p>
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'">在反馈控制系统中，不管出于什么原因（外部扰动或内部变化），只要被控制量偏离规定值，就会产生相应的控制作用去消除偏差。因此，转速电流双闭环同开环控制系统相比，具有抑制干扰的能力，对元件特性变化不敏感，并能改善系统的响应特性。</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 12pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&alpha;</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-spacerun: 'yes'">=</span><span style="FONT-SIZE: 12pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">&beta;工作制配合控制有环流可逆系统的正向制动过程，按电流方向的不同分为本组整流阶段和它组制动阶段。</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'">直流调速系统的静态指标主要有调速范围和静差率</span></p><!--EndFragment-->
A:错误
B:正确

<p class="p0" style="MARGIN-TOP: 0pt; MARGIN-BOTTOM: 0pt"><span style="FONT-SIZE: 12pt; FONT-FAMILY: '宋体'; mso-spacerun: 'yes'">在逻辑控制的无环流可逆调速系统中，设置封锁延时是因为等到电枢电流真正断续后再封锁原组（原来导通组），防止本组逆变颠覆</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'">调压调速就是在保持电动机在满磁的状态下，通过调节电动机的反电动势进行调速度。</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'">调压调速下，允许电动机的输出功率恒定不变。</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'">带电流截止负反馈的单闭环调速系统解决了限流问题起动的问题，使系统能较快得起动运行，但静、动态特性都还不够理想</span></p><!--EndFragment-->
A:错误
B:正确