述中，正确的是______。 a. 电机在堵转情况下不能工作b. 电动机不能在最大负载力矩下起动 c
shu zhong zheng que de shi ______ a. dian ji zai du zhuan qing kuang xia bu neng gong zuo b. dian dong ji bu neng zai zui da fu zai li ju xia qi dong c
可以在集控室手动起、停泵，不可在机旁手动起、停泵49. 下列关于电动绞缆机对拖动电动机的基本要求的叙
ke yi zai ji kong shi shou dong qi ting beng bu ke zai ji pang shou dong qi ting beng 49. xia lie guan yu dian dong jiao lan ji dui tuo dong dian dong ji de ji ben yao qiu de xu
逐台重新自动起动 c.在自动运行方式，当运行泵发生故障时，备用泵能够自动进行切换d.在遥控方式时，只
zhu tai zhong xin zi dong qi dong c. zai zi dong yun hang fang shi dang yun hang beng fa sheng gu zhang shi bei yong beng neng gou zi dong jin hang qie huan d. zai yao kong fang shi shi zhi
因某种原因电网失电后，所有运行泵都停止运行，电网恢复供电后，各组原来运行的泵依据事先设定好的时间顺序
yin mou zhong yuan yin dian wang shi dian hou suo you yun hang beng dou ting zhi yun hang dian wang hui fu gong dian hou ge zu yuan lai yun hang de beng yi ju shi xian she ding hao de shi jian shun xu
的功能叙述错误的是______。 a. 在遥控方式时，可以在集控室对各组泵进行遥控手动起动或停止b.
de gong neng xu shu cuo wu de shi ______ a. zai yao kong fang shi shi ke yi zai ji kong shi dui ge zu beng jin hang yao kong shou dong qi dong huo ting zhi b.
；星形接法d. 三角形接法；三角形接法 48. 关于自动化船舶机舱中重要泵的互为备用自动切换控制电路
xing xing jie fa d. san jiao xing jie fa san jiao xing jie fa 48. guan yu zi dong hua chuan bo ji cang zhong zhong yao beng de hu wei bei yong zi dong qie huan kong zhi dian lu
动后改为______正常工作。 a. 三角形接法；星形接法b. 星形接法；三角形接法 c. 星形接法
dong hou gai wei ______ zheng chang gong zuo a. san jiao xing jie fa xing xing jie fa b. xing xing jie fa san jiao xing jie fa c. xing xing jie fa
. 对于额火车列车表定电压为380伏三角形接法的鼠笼式电动机，可以用______进行起动，以减小其起动电流，起
. dui yu e huo che lie che biao ding dian ya wei 380 fu san jiao xing jie fa de shu long shi dian dong ji ke yi yong ______ jin hang qi dong yi jian xiao qi qi dong dian liu qi
__的控制。 a. 气压高限和低限b.冷却水和放残液 c. 手动和自动切换d.集控室和机旁两地 47
__ de kong zhi a. qi ya gao xian he di xian b. leng que shui he fang can ye c. shou dong he zi dong qie huan d. ji kong shi he ji pang liang di 47
能转动d.火车列车表 按下sbr后，kmr接触器衔铁不吸合 46. 空压机自动控制系统中的双位控制是指____
neng zhuan dong d. huo che lie che biao an xia sbr hou kmr jie chu qi xian tie bu xi he 46. kong ya ji zi dong kong zhi xi tong zhong de shuang wei kong zhi shi zhi ____
按下sbf后，kmf接触器衔铁不吸合 c. 按下sbf后，kmf接触器衔铁吸合、又立即释放，电机不
an xia sbf hou kmf jie chu qi xian tie bu xi he c. an xia sbf hou kmf jie chu qi xian tie xi he you li ji shi fang dian ji bu
触点位置互换，其它不变；则会出现______。 a. 按下sbf或sbr电机均能正常起动，运转 b.
chu dian wei zhi hu huan qi ta bu bian ze hui chu xian ______ a. an xia sbf huo sbr dian ji jun neng zheng chang qi dong yun zhuan b.
位d. 模拟 45. 如图所示的电动机正反转控制电火车列车表路，若将反转接触器kmr与正转接触器kmf常闭辅助
wei d. mo ni 45. ru tu suo shi de dian dong ji zheng fan zhuan kong zhi dian huo che lie che biao lu ruo jiang fan zhuan jie chu qi kmr yu zheng zhuan jie chu qi kmf chang bi fu zhu
1/2即可，常采取的最为简单、经济易行的控制方案是______控制。 a. 计算机b. 随动c. 双
1/2 ji ke chang cai qu de zui wei jian dan jing ji yi hang de kong zhi fang an shi ______ kong zhi a. ji suan ji b. sui dong c. shuang
.额定电流值 44. 在被控对象的控制精度要求不高时，例如：水柜水位控制只要保证水火车列车表位在柜高的3/4～
. e ding dian liu zhi 44. zai bei kong dui xiang de kong zhi jing du yao qiu bu gao shi li ru shui gui shui wei kong zhi zhi yao bao zheng shui huo che lie che biao wei zai gui gao de 3/4
一般按被保护电动机的______选取。 a. 起动电流值b.起动电流值的2倍c. 额定电流值的2倍d
yi ban an bei bao hu dian dong ji de ______ xuan qu a. qi dong dian liu zhi b. qi dong dian liu zhi de 2 bei c. e ding dian liu zhi de 2 bei d
合开关c. 中间继电器d. 热继电器 43. 在利用热继电器对电动火车列车表机过载保护时，热继电器的整定电流值
he kai guan c. zhong jian ji dian qi d. re ji dian qi 43. zai li yong re ji dian qi dui dian dong huo che lie che biao ji guo zai bao hu shi re ji dian qi de zheng ding dian liu zhi
，它们中间有轴伸到柜门的正面与旋钮相连，并受其旋转控制；这类电器是______。 a. 接触器b.组
ta men zhong jian you zhou shen dao gui men de zheng mian yu xuan niu xiang lian bing shou qi xuan zhuan kong zhi zhe lei dian qi shi ______ a. jie chu qi b. zu
压保护d.过载保护和缺相保护 42. 船舶电站中，控制屏柜门的背面常有一火车列车表些一层或多层的四方柱形的电器
ya bao hu d. guo zai bao hu he que xiang bao hu 42. chuan bo dian zhan zhong kong zhi ping gui men de bei mian chang you yi huo che lie che biao xie yi ceng huo duo ceng de si fang zhu xing de dian qi
41. 双金属片热继电器在电动机控制线路中的作用是______。 a. 短路保护b.零位保护c. 失
41. shuang jin shu pian re ji dian qi zai dian dong ji kong zhi xian lu zhong de zuo yong shi ______ a. duan lu bao hu b. ling wei bao hu c. shi