电机与拖动-作业二
1.[判断题] 只要电磁转矩等于负载转矩，电力拖动系统就能在某一转速下平衡稳定的运行。
奥鹏作业答案可以联系Q Q
A.正确
B.错误
正确答案:——B——
2.[判断题] 不论变压器的负载性质如何，变压器的外特性曲线U２＝f（I２）总是一条下降的曲线。
A.正确
B.错误
正确答案:——B——
3.[判断题] 他励直流电动机采用电枢回路串电阻调速可以实现无级调速。
A.正确
B.错误
正确答案:——B——
4.[判断题] 使用电流互感器时二次侧不允许开路。
A.正确
B.错误
正确答案:————
5.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"三相绕线式异步电动机反接制动时机械功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:12.0pt;mso-text-raise:-12.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_52" o:spid="_x0000_i1050" type="#_x0000_t75" style='width:103.8pt;height:31.2pt' o
le="" <v:imagedata src="djytdpdt.files/image049.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="138" height="42" v:shapes="对象_x0020_52" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image050.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_52" DrawAspect="Content" ObjectID="_1617439833" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
6.[判断题] 他励直流电动机采用电枢电压反接制动迅速停车，位能性负载，当n=0时不断开电源，电机最后稳定运行在回馈制动状态。
A.正确
B.错误
正确答案:————
7.[判断题] 电压互感器在工作中，副方不能短路。
A.正确
B.错误
正确答案:————
8.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"三相异步电动机的电磁功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:5.0pt;mso-text-raise:-5.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_35" o:spid="_x0000_i1041" type="#_x0000_t75" style='width:55.2pt;height:16.8pt' ole="" <v:imagedata src="djytdpdt.files/image031.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="74" height="22" v:shapes="对象_x0020_35" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image032.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_35" DrawAspect="Content" ObjectID="_1617439824" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext;position:relative;top:5.0pt;mso-text-raise:-5.0pt"，</span<span style="mso-bidi-font-size:10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";color:windowtext"机械功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:6.0pt;mso-text-raise:-6.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_36" o:spid="_x0000_i1042" type="#_x0000_t75" style='width:52.8pt;height:18pt' ole="" <v:imagedata src="djytdpdt.files/image033.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="70" height="24" v:shapes="对象_x0020_36" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image034.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_36" DrawAspect="Content" ObjectID="_1617439825" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
9.[判断题] 电动机拖动的负载越大，电流就越大，因此，三相异步电动机只要是空载，就都可以全压起动。
A.正确
B.错误
正确答案:————
10.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"自耦变压器的绕组容量是变压器容量的</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:15.0pt;mso-text-raise:-15.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_50" o:spid="_x0000_i1049" type="#_x0000_t75" style='width:18pt;height:34.2pt' ole="" <v:imagedata src="djytdpdt.files/image047.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="24" height="46" v:shapes="对象_x0020_50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image048.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_50" DrawAspect="Content" ObjectID="_1617439832" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
11.[判断题] 直流发电机电枢导体感应电动势和电流都是直流电。
A.正确
B.错误
正确答案:————
12.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"直流电动机运行于电动状态时，产生感应电动势</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext" <!--[if gte vml 1]<v:shape id="对象_x0020_24" o:spid="_x0000_i1036" type="#_x0000_t75" style='width:16.2pt; height:18pt' ole="" <v:imagedata src="djytdpdt.files/image021.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="22" height="24" v:shapes="对象_x0020_24" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image022.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_24" DrawAspect="Content" ObjectID="_1617439819" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"是反电动势，产生的电磁转矩</span<span lang="EN-US" style="mso-bidi-font-size: 10.5pt;color:windowtext"T</span<span style="mso-bidi-font-size:10.5pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"是反抗性的。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
13.[判断题] 变压器的功率因素总是滞后的，而异步电动机的功率因素在负载较小时是超前的。
A.正确
B.错误
正确答案:————
14.[判断题] <p class="MsoNormal" align="left" style="margin-top:10.0pt;margin-right:0cm; margin-bottom:10.0pt;margin-left:0cm;text-align:left;line-height:24.0pt; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"由公式</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:7.0pt;mso-text-raise:-7.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_12" o:spid="_x0000_i1030" type="#_x0000_t75" style='width:91.2pt;height:19.2pt' o:ole="" <v:imagedata src="djytdpdt.files/image011.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="122" height="26" v:shapes="对象_x0020_12" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image012.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_12" DrawAspect="Content" ObjectID="_1617439813" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"可知，电磁转矩与转子电流成正比，因为直接起动时的起动电流很大，所以起动转矩也很大。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;mso-font-kerning: 0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
15.[判断题] 异步电动机的转子是鼠笼式的。
A.正确
B.错误
正确答案:————
16.[判断题] 改变并励直流电动机电源的极性，电动机旋转方向反向。
A.正确
B.错误
正确答案:————
17.[判断题] 三相绕线式异步电动机，电源电压一定，转子回路电阻适当增大时，最大转矩增大，而临界转差率不变。
A.正确
B.错误
正确答案:————
18.[判断题] 变压器空载运行时电源送入的有功功率主要是铁耗。
A.正确
B.错误
正确答案:————
19.[判断题] 变压器不可以将原边向副边进行折算。
A.正确
B.错误
正确答案:————
20.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"变压器分析计算中采用标幺值时，不同的物理量可能会相等，比如短路阻抗标幺值等于短路电压的标幺值，即</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:6.0pt;mso-text-raise:-6.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_46" o:spid="_x0000_i1047" type="#_x0000_t75" style='width:58.8pt;height:18pt' o:ole="" <v:imagedata src="djytdpdt.files/image043.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="78" height="24" v:shapes="对象_x0020_46" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image044.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_46" DrawAspect="Content" ObjectID="_1617439830" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
21.[单选题] 变压器的电源电压不变，随着负载减少到空载，主磁通将（ ）
A.随之增大
B.随之减少
C.先减少后增大
D.基本不变
正确答案:————
22.[单选题] 变压器的铁心导磁性能越好，励磁电抗Xm（ ） ,励磁电流（ ）
A.越大，越大
B.越小，越小
C.越大，越小
D.不变，不变
正确答案:————
23.[单选题] 直流电机电枢反应导致合成磁密为零的地方偏离了空载时的（ ）
A.磁极中心线上
B.物理中性线上
C.几何中性线上
正确答案:————
24.[单选题] 若要改变并励直流发电机的电枢两端的正负极性，则应：
A.改变励磁绕组的接线或改变电枢绕组的接线
B.改变原动机转向
C.既改变原动机转向又改变励磁绕组接线
正确答案:————
25.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"额定电压为</span<span style="font-family:"Times New Roman";font-size:10.5pt;"220/110V</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"的单相变压器，低压边漏电抗为</span<span style="font-family:"Times New Roman";font-size:10.5pt;"0.075<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095750_736.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span，折合到一次侧为：<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.075<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100447_597.png" /</span <span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.15<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100458_35.png" /</span <span style="font-family:Microsoft Yahei;font-size:12pt;" </span
C.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.3<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095823_483.png" /</span
正确答案:————
26.[单选题] 电流互感器二次绕组绝对不许（ ），电压互感器二次绕组不许（ ）。
A.短路，短路
B.短路，开路
C.开路 ，短路
正确答案:————
27.[单选题] 变压器副边绕组开路，原边电压因故升高时，变压器铁心中产生的铁损耗将（ ）。
A.不变；
B.增大；
C.减小。
正确答案:————
28.[单选题] 与固有机械特性相比，人为机械特性上的最大电磁转矩减小，临界转差率没变，则该人为机械特性是异步电动机的：（ ）
A.定子串接电阻的人为机械特性；
B.转子串接电阻的人为机械特性；
C.降低电压的人为机械特性。
正确答案:————
29.[单选题] 他励直流电动机的人为特性与固有特性相比，其理想空载转速和斜率均发生了变化，那么这条人为特性一定是( )。
A.串电阻的人为特性； q1 6 4 7 861640
B.降压的人为特性；
C.弱磁的人为特性
正确答案:————
30.[单选题] 一台他励直流发电机由额定运行状态转速下降到原来的50%，而励磁电流、电枢电流都不变，则
A.Ea和T都下降到原来的50%
B.T下降到原来的50%
C.Ea下降到原来的50%
正确答案:————
31.[单选题] 直流发电机由主磁通产生感应电动势的有
A.电枢绕组
B.电枢绕组和励磁绕组
C.励磁绕组
正确答案:————
32.[单选题] 他励直流电动机降低电枢电压的人为特性的特点为（ ）
A.特性直线的斜率与电压成正比变化
B.理想空载转速不变
C.斜率不变
正确答案:————
33.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"关于三相异步电动机转子边产生的磁动势<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101252_49.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span的旋转速度说法正确的是（ <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"相对定子边磁动势<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101305_33.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span <span style="font-family:Microsoft Yahei;font-size:10.5pt;"静止 </span<span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B. 相对定子静止
C. 相对转子静止
正确答案:————
34.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"变压器负载运行时，随着负载电流的增大，其铁心损耗<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100008_669.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span和铜损耗<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100015_370.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span会（ <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095339_393.png" /增大，<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095346_882.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span不变 <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095355_176.png" /不变，<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095359_427.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span增大 <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
C. 都会增大
正确答案:————
35.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;mso-para-margin-left:0.0000gd;text-indent:0.0000pt;mso-char-indent-count:0.0000;line-height:20.0000pt;mso-line-height-rule:exactly;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"一台变单相压器在高压边做空载实验求得的励磁参数和在低压边做空载实验求得的参数应（ ）。假设</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="184" height="48" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36321.png"</span.<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
A.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"大</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:3.0000pt;mso-text-raise:-3.0000pt;"<img width="40" height="43" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36433.png"</span倍 <span style="mso-spacerun:'yes';font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
B.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"小</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:3.0000pt;mso-text-raise:-3.0000pt;"<img width="40" height="43" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36556.png"</span <span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
C.一样大
正确答案:————
36.[单选题] 三相感应电机通以三相对称电流，若一相绕组断线（绕组无中线），将产生（ ）。
A.圆形旋转磁场；
B.脉振磁场；
C.椭圆形旋转磁场。
正确答案:————
37.[单选题] 有一台他励直流电动机要想把转速从基速调高，采取下列哪一种调速方法是可行的( )。
A.降低电源电压调速；
B.增大磁通调速；
C.减弱磁通调速
正确答案:————
38.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;text-indent:0.0000pt;" <span style="font-family:Microsoft Yahei;font-size:10.5000pt;"一台三相6极电动机，每极每相槽数q=3，则定子总槽数Z</span<sub<span style="font-family:Microsoft Yahei;font-size:10.5000pt;vertical-align:sub;"1</span</sub<span style="font-family:Microsoft Yahei;font-size:10.5000pt;"和极距<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180440_306.png" alt="" /</span分别为（ <span style="font-family:'Times New Roman';font-size:10.5000pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;" </span
A.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181207_212.png" alt="" /
B.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181245_909.png" alt="" /
C.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180627_185.png" alt="" /
正确答案:————
39.[单选题] 一台六极直流电机电枢绕组为单波绕组，其并联支路对数为
A.1
B.2
C.3
D.6
正确答案:————
40.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;mso-para-margin-left:0.0000gd;text-indent:0.0000pt;mso-char-indent-count:0.0000;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"并励直流发电机的电磁功率</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="49" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34413.png"</span与输出功率<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="40" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34526.png"</span之差等于（ <span style="font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
A.<p class="MsoNormal" style="display:inline;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"励磁铜耗</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:7.0000pt;mso-text-raise:-7.0000pt;"<img width="63" height="57" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34648.png"</span和转子铜耗<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="63" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34761.png"</span之和 <span style="font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
B.<p class="MsoNormal" style="display:inline;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"铁耗</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="57" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34877.png"</span和附加损耗<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="47" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34990.png"</span之和 <span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
C.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="54" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD35103.png"</span+<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="57" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD35212.png"</span <o:p</o:p
正确答案:————
1.[判断题] 只要电磁转矩等于负载转矩，电力拖动系统就能在某一转速下平衡稳定的运行。
奥鹏作业答案可以联系Q Q
A.正确
B.错误
正确答案:——B——
2.[判断题] 不论变压器的负载性质如何，变压器的外特性曲线U２＝f（I２）总是一条下降的曲线。
A.正确
B.错误
正确答案:——B——
3.[判断题] 他励直流电动机采用电枢回路串电阻调速可以实现无级调速。
A.正确
B.错误
正确答案:——B——
4.[判断题] 使用电流互感器时二次侧不允许开路。
A.正确
B.错误
正确答案:————
5.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"三相绕线式异步电动机反接制动时机械功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:12.0pt;mso-text-raise:-12.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_52" o:spid="_x0000_i1050" type="#_x0000_t75" style='width:103.8pt;height:31.2pt' o
le="" <v:imagedata src="djytdpdt.files/image049.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="138" height="42" v:shapes="对象_x0020_52" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image050.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_52" DrawAspect="Content" ObjectID="_1617439833" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</spanA.正确
B.错误
正确答案:————
6.[判断题] 他励直流电动机采用电枢电压反接制动迅速停车，位能性负载，当n=0时不断开电源，电机最后稳定运行在回馈制动状态。
A.正确
B.错误
正确答案:————
7.[判断题] 电压互感器在工作中，副方不能短路。
A.正确
B.错误
正确答案:————
8.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"三相异步电动机的电磁功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:5.0pt;mso-text-raise:-5.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_35" o:spid="_x0000_i1041" type="#_x0000_t75" style='width:55.2pt;height:16.8pt' o
le="" <v:imagedata src="djytdpdt.files/image031.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="74" height="22" v:shapes="对象_x0020_35" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image032.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_35" DrawAspect="Content" ObjectID="_1617439824" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext;position:relative;top:5.0pt;mso-text-raise:-5.0pt"，</span<span style="mso-bidi-font-size:10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman"; mso-hansi-font-family:"Times New Roman";color:windowtext"机械功率</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:6.0pt;mso-text-raise:-6.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_36" o:spid="_x0000_i1042" type="#_x0000_t75" style='width:52.8pt;height:18pt' ole="" <v:imagedata src="djytdpdt.files/image033.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="70" height="24" v:shapes="对象_x0020_36" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image034.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_36" DrawAspect="Content" ObjectID="_1617439825" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</spanA.正确
B.错误
正确答案:————
9.[判断题] 电动机拖动的负载越大，电流就越大，因此，三相异步电动机只要是空载，就都可以全压起动。
A.正确
B.错误
正确答案:————
10.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"自耦变压器的绕组容量是变压器容量的</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:15.0pt;mso-text-raise:-15.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_50" o:spid="_x0000_i1049" type="#_x0000_t75" style='width:18pt;height:34.2pt' o
le="" <v:imagedata src="djytdpdt.files/image047.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="24" height="46" v:shapes="对象_x0020_50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image048.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_50" DrawAspect="Content" ObjectID="_1617439832" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</spanA.正确
B.错误
正确答案:————
11.[判断题] 直流发电机电枢导体感应电动势和电流都是直流电。
A.正确
B.错误
正确答案:————
12.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"直流电动机运行于电动状态时，产生感应电动势</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext" <!--[if gte vml 1]<v:shape id="对象_x0020_24" o:spid="_x0000_i1036" type="#_x0000_t75" style='width:16.2pt; height:18pt' o
le="" <v:imagedata src="djytdpdt.files/image021.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="22" height="24" v:shapes="对象_x0020_24" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image022.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_24" DrawAspect="Content" ObjectID="_1617439819" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"是反电动势，产生的电磁转矩</span<span lang="EN-US" style="mso-bidi-font-size: 10.5pt;color:windowtext"T</span<span style="mso-bidi-font-size:10.5pt; font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"是反抗性的。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;mso-font-kerning:0pt" <o:p</o:p</spanA.正确
B.错误
正确答案:————
13.[判断题] 变压器的功率因素总是滞后的，而异步电动机的功率因素在负载较小时是超前的。
A.正确
B.错误
正确答案:————
14.[判断题] <p class="MsoNormal" align="left" style="margin-top:10.0pt;margin-right:0cm; margin-bottom:10.0pt;margin-left:0cm;text-align:left;line-height:24.0pt; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"由公式</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:7.0pt;mso-text-raise:-7.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_12" o:spid="_x0000_i1030" type="#_x0000_t75" style='width:91.2pt;height:19.2pt' o:ole="" <v:imagedata src="djytdpdt.files/image011.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="122" height="26" v:shapes="对象_x0020_12" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image012.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_12" DrawAspect="Content" ObjectID="_1617439813" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"可知，电磁转矩与转子电流成正比，因为直接起动时的起动电流很大，所以起动转矩也很大。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;mso-font-kerning: 0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
15.[判断题] 异步电动机的转子是鼠笼式的。
A.正确
B.错误
正确答案:————
16.[判断题] 改变并励直流电动机电源的极性，电动机旋转方向反向。
A.正确
B.错误
正确答案:————
17.[判断题] 三相绕线式异步电动机，电源电压一定，转子回路电阻适当增大时，最大转矩增大，而临界转差率不变。
A.正确
B.错误
正确答案:————
18.[判断题] 变压器空载运行时电源送入的有功功率主要是铁耗。
A.正确
B.错误
正确答案:————
19.[判断题] 变压器不可以将原边向副边进行折算。
A.正确
B.错误
正确答案:————
20.[判断题] <p class="MsoNormal" align="left" style="margin-bottom:7.5pt;text-align:left; mso-pagination:widow-orphan;background:white"<span style="mso-bidi-font-size: 10.5pt;font-family:Microsoft Yahei;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family: "Times New Roman";color:windowtext"变压器分析计算中采用标幺值时，不同的物理量可能会相等，比如短路阻抗标幺值等于短路电压的标幺值，即</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt;color:windowtext;position:relative; top:6.0pt;mso-text-raise:-6.0pt" <!--[if gte vml 1]<v:shape id="对象_x0020_46" o:spid="_x0000_i1047" type="#_x0000_t75" style='width:58.8pt;height:18pt' o:ole="" <v:imagedata src="djytdpdt.files/image043.wmz" o:title=""/ </v:shape<![endif]-- <!--[if !vml]--<img width="78" height="24" v:shapes="对象_x0020_46" src="http://wljy.whut.edu.cn:80/uploadfiles/word/djytdpdt.files/image044.png" <!--[endif]-- <!--[if gte mso 9]<xml <o:OLEObject Type="Embed" ProgID="Equation.3" ShapeID="对象_x0020_46" DrawAspect="Content" ObjectID="_1617439830" </o:OLEObject </xml<![endif]--</span<span style="mso-bidi-font-size:10.5pt;font-family: 宋体;mso-ascii-font-family:"Times New Roman";mso-hansi-font-family:"Times New Roman"; color:windowtext"。</span<span lang="EN-US" style="mso-bidi-font-size:10.5pt; color:windowtext;mso-font-kerning:0pt" <o:p</o:p</span
A.正确
B.错误
正确答案:————
21.[单选题] 变压器的电源电压不变，随着负载减少到空载，主磁通将（ ）
A.随之增大
B.随之减少
C.先减少后增大
D.基本不变
正确答案:————
22.[单选题] 变压器的铁心导磁性能越好，励磁电抗Xm（ ） ,励磁电流（ ）
A.越大，越大
B.越小，越小
C.越大，越小
D.不变，不变
正确答案:————
23.[单选题] 直流电机电枢反应导致合成磁密为零的地方偏离了空载时的（ ）
A.磁极中心线上
B.物理中性线上
C.几何中性线上
正确答案:————
24.[单选题] 若要改变并励直流发电机的电枢两端的正负极性，则应：
A.改变励磁绕组的接线或改变电枢绕组的接线
B.改变原动机转向
C.既改变原动机转向又改变励磁绕组接线
正确答案:————
25.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"额定电压为</span<span style="font-family:"Times New Roman";font-size:10.5pt;"220/110V</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"的单相变压器，低压边漏电抗为</span<span style="font-family:"Times New Roman";font-size:10.5pt;"0.075<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095750_736.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span，折合到一次侧为：<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.075<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100447_597.png" /</span <span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.15<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100458_35.png" /</span <span style="font-family:Microsoft Yahei;font-size:12pt;" </span
C.<p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"0.3<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095823_483.png" /</span
正确答案:————
26.[单选题] 电流互感器二次绕组绝对不许（ ），电压互感器二次绕组不许（ ）。
A.短路，短路
B.短路，开路
C.开路 ，短路
正确答案:————
27.[单选题] 变压器副边绕组开路，原边电压因故升高时，变压器铁心中产生的铁损耗将（ ）。
A.不变；
B.增大；
C.减小。
正确答案:————
28.[单选题] 与固有机械特性相比，人为机械特性上的最大电磁转矩减小，临界转差率没变，则该人为机械特性是异步电动机的：（ ）
A.定子串接电阻的人为机械特性；
B.转子串接电阻的人为机械特性；
C.降低电压的人为机械特性。
正确答案:————
29.[单选题] 他励直流电动机的人为特性与固有特性相比，其理想空载转速和斜率均发生了变化，那么这条人为特性一定是( )。
A.串电阻的人为特性； q1 6 4 7 861640
B.降压的人为特性；
C.弱磁的人为特性
正确答案:————
30.[单选题] 一台他励直流发电机由额定运行状态转速下降到原来的50%，而励磁电流、电枢电流都不变，则
A.Ea和T都下降到原来的50%
B.T下降到原来的50%
C.Ea下降到原来的50%
正确答案:————
31.[单选题] 直流发电机由主磁通产生感应电动势的有
A.电枢绕组
B.电枢绕组和励磁绕组
C.励磁绕组
正确答案:————
32.[单选题] 他励直流电动机降低电枢电压的人为特性的特点为（ ）
A.特性直线的斜率与电压成正比变化
B.理想空载转速不变
C.斜率不变
正确答案:————
33.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"关于三相异步电动机转子边产生的磁动势<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101252_49.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span的旋转速度说法正确的是（ <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"相对定子边磁动势<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205101305_33.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span <span style="font-family:Microsoft Yahei;font-size:10.5pt;"静止 </span<span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B. 相对定子静止
C. 相对转子静止
正确答案:————
34.[单选题] <p class="MsoNormal" style="text-indent:0pt;margin-left:0pt;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"变压器负载运行时，随着负载电流的增大，其铁心损耗<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100008_669.png" /</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span和铜损耗<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205100015_370.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span会（ <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5pt;" </span
A.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095339_393.png" /增大，<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095346_882.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span不变 <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
B.<p class="MsoNormal" style="display:inline;" <span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095355_176.png" /不变，<img alt="" src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191205/20191205095359_427.png" /<span style="font-family:Microsoft Yahei;font-size:10.5pt;"</span增大 <span style="font-family:"Times New Roman";font-size:10.5pt;" </span<span style="font-family:Microsoft Yahei;font-size:12pt;" </span
C. 都会增大
正确答案:————
35.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;mso-para-margin-left:0.0000gd;text-indent:0.0000pt;mso-char-indent-count:0.0000;line-height:20.0000pt;mso-line-height-rule:exactly;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"一台变单相压器在高压边做空载实验求得的励磁参数和在低压边做空载实验求得的参数应（ ）。假设</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="184" height="48" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36321.png"</span.<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
A.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"大</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:3.0000pt;mso-text-raise:-3.0000pt;"<img width="40" height="43" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36433.png"</span倍 <span style="mso-spacerun:'yes';font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
B.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"小</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:3.0000pt;mso-text-raise:-3.0000pt;"<img width="40" height="43" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD36556.png"</span <span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
C.一样大
正确答案:————
36.[单选题] 三相感应电机通以三相对称电流，若一相绕组断线（绕组无中线），将产生（ ）。
A.圆形旋转磁场；
B.脉振磁场；
C.椭圆形旋转磁场。
正确答案:————
37.[单选题] 有一台他励直流电动机要想把转速从基速调高，采取下列哪一种调速方法是可行的( )。
A.降低电源电压调速；
B.增大磁通调速；
C.减弱磁通调速
正确答案:————
38.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;text-indent:0.0000pt;" <span style="font-family:Microsoft Yahei;font-size:10.5000pt;"一台三相6极电动机，每极每相槽数q=3，则定子总槽数Z</span<sub<span style="font-family:Microsoft Yahei;font-size:10.5000pt;vertical-align:sub;"1</span</sub<span style="font-family:Microsoft Yahei;font-size:10.5000pt;"和极距<img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180440_306.png" alt="" /</span分别为（ <span style="font-family:'Times New Roman';font-size:10.5000pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;" </span
A.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181207_212.png" alt="" /
B.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203181245_909.png" alt="" /
C.<p class="MsoNormal" style="display:inline;" <img src="http://wljy.whut.edu.cn:80/uploadfiles/kindeditorAttached/image/20191203/20191203180627_185.png" alt="" /
正确答案:————
39.[单选题] 一台六极直流电机电枢绕组为单波绕组，其并联支路对数为
A.1
B.2
C.3
D.6
正确答案:————
40.[单选题] <p class="MsoNormal" style="margin-left:0.0000pt;mso-para-margin-left:0.0000gd;text-indent:0.0000pt;mso-char-indent-count:0.0000;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"并励直流发电机的电磁功率</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="49" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34413.png"</span与输出功率<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="40" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34526.png"</span之差等于（ <span style="font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"）</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
A.<p class="MsoNormal" style="display:inline;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"励磁铜耗</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:7.0000pt;mso-text-raise:-7.0000pt;"<img width="63" height="57" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34648.png"</span和转子铜耗<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="63" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34761.png"</span之和 <span style="font-family:'Times New Roman';mso-fareast-font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;" </span<span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
B.<p class="MsoNormal" style="display:inline;"<span style="mso-spacerun:'yes';font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;"铁耗</span<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="57" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34877.png"</span和附加损耗<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:5.0000pt;mso-text-raise:-5.0000pt;"<img width="47" height="50" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD34990.png"</span之和 <span style="font-family:Microsoft Yahei;font-size:12.0000pt;mso-font-kerning:1.0000pt;" <o:p</o:p</span
C.<p class="MsoNormal" style="display:inline;"<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="54" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD35103.png"</span+<span style="font-family:Microsoft Yahei;font-size:10.5000pt;mso-font-kerning:1.0000pt;position:relative;top:6.0000pt;mso-text-raise:-6.0000pt;"<img width="57" height="54" src="http://wljy.whut.edu.cn:80/uploadfiles/word/DJYTFD.files/DJYTFD35212.png"</span <o:p</o:p
正确答案:————
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