{"name":"细纱工题库","level":"五级 / 四级 / 三级 / 二级 / 一级","org":"人力资源和社会保障部门","count":300,"questions":[{"id":1,"type":"single","stem":"细纱机纺纱过程中，前罗拉与后罗拉之间的牵伸区称为牵伸区，粗纱在此区域内被抽长拉细，日常操作中判断牵伸是否正常最直接的观察部位是","options":["粗纱在牵伸区内是否出现明显硬头或涌纱","锭子转速是否稳定在设定值","钢领板升降是否到达上下极限位置","细纱管纱成形是否达到规定直径"],"answer":[0],"explanation":"牵伸区是粗纱被抽长拉细的区域，出现硬头（牵伸不开）或涌纱（牵伸过大）直接反映牵伸状态异常。锭速稳定属于传动问题，钢领板升降属于卷绕成形问题，管纱直径属于卷绕完成情况，均不直接反映牵伸区工作状态。","tier":"挑战"},{"id":2,"type":"single","stem":"挡车工在细纱机上进行接头操作时，将纱尾与须条搭接后应进行的第一个动作是","options":["用拇指指尖将搭接处轻轻搓捻使纤维互相抱合","立即放开纱尾让锭子自然加捻卷绕","用剪刀把纱尾多余部分剪掉再搓捻","先向纱尾吹气使纤维松散再搭接"],"answer":[0],"explanation":"接头时须条与纱尾搭接后需先搓捻使纤维相互抱合形成接头强力，再放开让加捻卷绕。立即放开会导致接头处无抱合力而断头；先剪再搓会损失搭接纤维；吹气松散纤维是错误做法，会使接头更松散。","tier":"进阶"},{"id":3,"type":"single","stem":"细纱工序中，粗纱定量偏轻而细纱号数不变时，最可能出现的质量问题是","options":["细纱实际号数偏细、强力下降","细纱实际号数偏粗、条干恶化","细纱捻度明显偏大、手感发硬","细纱毛羽显著增多、管纱成形不良"],"answer":[0],"explanation":"粗纱定量偏轻时，在牵伸倍数不变的情况下细纱实际号数会偏细，截面纤维根数减少导致强力下降。号数偏粗是粗纱偏重所致；捻度由锭速与前罗拉速度决定，与粗纱定量无直接关系；毛羽与钢丝圈、钢领状态关系更大。","tier":"进阶"},{"id":4,"type":"single","stem":"细纱机钢领与钢丝圈配合过紧时，运转中最典型的表现是","options":["钢丝圈磨损加剧、纱线毛羽增多且断头增加","纱线捻度明显偏小、强力不足","管纱成形直径偏大、卷绕过满","锭子振动增大、锭带频繁脱落"],"answer":[0],"explanation":"钢领与钢丝圈配合过紧会使摩擦加剧，钢丝圈磨损快、纱线毛羽增多、张力增大导致断头增加。捻度由锭速与前罗拉速度决定，与钢领钢丝圈配合无关；管纱直径由卷绕成形机构控制；锭子振动主要与锭子本身及锭带有关。","tier":"基础"},{"id":5,"type":"single","stem":"挡车工在巡回中发现某锭子纱线出现周期性粗节，检查该锭牵伸区未发现异常，下一步最应检查的是","options":["粗纱是否有周期性粗节或细节","锭子是否弯曲偏心","钢领是否磨损起槽","钢丝圈是否选型过轻"],"answer":[0],"explanation":"细纱出现周期性粗节而牵伸区正常，应追溯粗纱本身是否有周期性不匀，因为粗纱缺陷会按牵伸倍数传递到细纱。锭子弯曲偏心、钢领磨损起槽、钢丝圈过轻通常造成毛羽、断头或张力异常，不产生周期性粗节。","tier":"挑战"},{"id":6,"type":"single","stem":"细纱机牵伸罗拉隔距调整的主要依据是","options":["所纺纤维长度及粗纱定量","锭子转速与钢领直径","细纱号数与捻系数","车间温湿度与粗纱回潮"],"answer":[0],"explanation":"罗拉隔距应根据纤维长度（主体长度）并参考粗纱定量来确定，以保证纤维在牵伸区内受到有效控制。锭速、钢领直径、细纱号数、捻系数、温湿度回潮均不决定罗拉隔距的大小。","tier":"基础"},{"id":7,"type":"single","stem":"细纱工序中，适当提高捻系数对纱线的影响是","options":["纱线强力提高但手感变硬、产量降低","纱线强力下降但条干改善","纱线毛羽减少但号数偏粗","纱线捻度降低但伸长增大"],"answer":[0],"explanation":"捻系数提高使纱线捻度增加，纤维间抱合增强、强力提高，但手感变硬，且捻度增加会限制产量。强力下降、条干改善、号数偏粗、捻度降低等描述均与提高捻系数的实际效果不符。","tier":"基础"},{"id":8,"type":"single","stem":"细纱机运行中锭带打滑，对纱线质量最直接的影响是","options":["锭速下降导致捻度不足、强力降低","牵伸倍数增大导致号数偏细","钢领板升降速度变慢导致成形不良","粗纱喂入量增加导致条干恶化"],"answer":[0],"explanation":"锭带打滑使锭子实际转速低于设定值，捻度随之不足，纱线强力降低。牵伸倍数由牵伸齿轮决定，与锭带无关；钢领板升降由成形机构控制；粗纱喂入量由后罗拉速度决定，均不受锭带打滑影响。","tier":"基础"},{"id":9,"type":"multi","stem":"细纱挡车工在巡回操作中，以下哪些做法有助于减少断头并保证接头质量","options":["接头前先看清纱尾方向再搭接，避免反向搓捻","巡回中按固定路线逐锭检查，发现异常及时处理","接头时用手指捏住须条端部再搓捻，防止纤维散失","发现断头后先关车再处理，避免影响相邻锭子","接头后立即将纱尾拉直让锭子加捻，不再检查接头外观"],"answer":[0,1,2],"explanation":"看清纱尾方向避免反向搓捻、按固定路线巡回及时处理异常、捏住须条端部防止纤维散失，都是保证接头质量和减少断头的正确操作。发现断头先关车会影响相邻锭子正常生产，通常应快速处理单锭断头；接头后不检查外观无法确认接头质量，均不正确。","tier":"挑战"},{"id":10,"type":"single","stem":"细纱机开车时，锭子与筒管的关系是","options":["锭子转动带动筒管一起回转","筒管固定不转由锭带摩擦传动","锭子固定由纱线带动筒管回转","锭子与筒管各自独立驱动"],"answer":[0],"explanation":"知识点是细纱机加捻卷绕原理。锭子由锭带传动回转，筒管插在锭子上随锭子同步回转，完成加捻卷绕，故A对。B错在筒管并非固定不转；C错在锭子不是固定件；D错在细纱机筒管不由独立驱动。","tier":"基础"},{"id":11,"type":"single","stem":"细纱挡车工处理断头时，左手拔管、右手引纱的操作顺序应是","options":["先找纱头再拔管引纱","先拔管再找纱头引纱","先引纱再拔管找头","先关车再拔管引纱"],"answer":[0],"explanation":"知识点是细纱接头操作程序。正确顺序是先找出断头纱尾，再拔管引纱接头，保证动作连贯，故A对。B错在未找纱头就拔管会打乱顺序；C错在引纱前应先确认纱头位置；D错在单锭断头无需关整台车。","tier":"基础"},{"id":12,"type":"single","stem":"细纱接头时纱尾的捻度应处理为","options":["保留原捻度直接接头","退去部分捻度再接头","加倍捻度后接头","完全退捻后接头"],"answer":[1],"explanation":"知识点是细纱接头工艺。接头前需退去纱尾部分捻度，使纤维松散便于搭接，故B对。A错在保留原捻度纤维不易抱合；C错在加倍捻度更不利于搭接；D错在完全退捻会损失强力。","tier":"基础"},{"id":13,"type":"single","stem":"细纱机牵伸区中，后区牵伸的主要作用是","options":["承担主要牵伸倍数","对须条进行整理牵伸","控制纤维运动速度","清除短绒杂质"],"answer":[1],"explanation":"知识点是细纱牵伸分配。后区牵伸倍数小，主要起整理和预牵伸作用，故B对。A错在主要牵伸由前区承担；C错在控制纤维速度是牵伸元件功能；D错在除杂不是牵伸区主要作用。","tier":"基础"},{"id":14,"type":"single","stem":"细纱断头后锭子上出现葫芦状纱圈，最可能的原因是","options":["锭速过高造成气圈失控","接头时纱尾搭接过长","钢丝圈偏轻造成张力小","导纱钩位置偏低"],"answer":[0],"explanation":"知识点是断头形态与原因判断。锭速过高使气圈失控，纱线在锭子上形成葫芦状纱圈，故A对。B错在搭接过长多形成粗节；C错在钢丝圈偏轻张力小易出松纱；D错在导纱钩偏低影响气圈形态而非葫芦状。","tier":"基础"},{"id":15,"type":"single","stem":"细纱机前罗拉与锭子之间纱线加捻时，捻度沿纱线方向的分布是","options":["从锭子向前罗拉逐渐增大","从前罗拉到锭子逐渐增大","整段纱线完全均匀一致","前罗拉处捻度最大"],"answer":[0],"explanation":"知识点是细纱加捻捻度传递。捻度自锭子向前罗拉方向传递并逐渐减弱，形成从锭子向前罗拉递减，即从前罗拉向锭子递增，故A对。B方向说反；C错在捻度并非均匀；D错在前罗拉处捻度最小。","tier":"基础"},{"id":16,"type":"single","stem":"挡车工在巡回中发现某锭子纱线张力突然增大且伴有尖叫，应首先检查","options":["粗纱是否用完","钢丝圈是否磨损或卡住","锭带是否断裂","牵伸齿轮是否损坏"],"answer":[1],"explanation":"知识点是细纱异常声音与张力判断。钢丝圈磨损或卡住会使张力突增并发出尖叫，故B对。A错在粗纱用完表现为空粗纱；C错在锭带断裂锭子停转；D错在牵伸齿轮损坏影响条干不产生尖叫。","tier":"挑战"},{"id":17,"type":"single","stem":"细纱机落纱后重新开车，出现大面积断头，最可能的原因是","options":["锭速设定偏低","钢丝圈号数偏轻","叶子板位置偏高","纱管未插到底"],"answer":[1],"explanation":"知识点是落纱后开车断头原因分析。钢丝圈偏轻使张力不足，开车冲击下易大面积断头，故B对。A错在锭速偏低张力小但不致大面积断头；C错在叶子板偏高影响气圈高度非主因；D错在个别纱管未插到底不会大面积断头。","tier":"基础"},{"id":18,"type":"single","stem":"细纱接头质量要求中，接头处直径应控制为","options":["与原纱直径基本相同","比原纱明显粗一倍","比原纱细一半","不作具体要求"],"answer":[0],"explanation":"知识点是细纱接头质量标准。接头处直径应与原纱基本一致，保证外观和强力，故A对。B错在粗一倍形成明显粗节；C错在细一半强力不足；D错在接头质量有明确标准不能随意。","tier":"基础"},{"id":19,"type":"single","stem":"细纱机正常纺纱时，前罗拉与后罗拉共同握持须条进行牵伸，若后区牵伸倍数偏大，最可能出现下列哪种现象","options":["须条在牵伸区中被拉断形成粗节","须条在牵伸区中打滑造成细节","须条在牵伸区中扭成辫状","须条在牵伸区中张力过小造成拥条"],"answer":[0],"explanation":"知识点：细纱机牵伸分配。后区牵伸偏大，后钳口对须条的握持力不足，须条在牵伸区中断裂形成粗节。错误项：打滑造成细节是后区牵伸偏小或握持力不足的表现；扭成辫状是捻度传递异常；张力过小拥条是牵伸倍数过小或导纱不良。","tier":"进阶"},{"id":20,"type":"single","stem":"挡车工在巡回中发现某锭子纱线出现周期性粗节，间隔与罗拉周长吻合，最合理的排查方向是","options":["检查该锭子前罗拉表面是否有损伤","检查该锭子锭带是否过松","检查该锭子钢领是否磨损","检查该锭子导纱钩是否松动"],"answer":[0],"explanation":"知识点：细纱机周期性与非周期性纱疵判断。粗节间隔与罗拉周长吻合，说明缺陷源在罗拉回转一周的对应位置，应查前罗拉表面损伤。错误项：锭带过松影响锭速，造成捻度不匀而非周期粗节；钢领磨损造成毛羽或断头；导纱钩松动影响气圈形态，均不产生与罗拉周长吻合的周期粗节。","tier":"挑战"},{"id":21,"type":"single","stem":"细纱接头操作中，采用抵管接头法时，右手的动作要领是","options":["将纱头绕导纱钩后向上抵住纱管","将纱头直接对准管纱顶端捻接","将纱头夹在食指与中指之间再贴上纱管","将纱头绕导纱钩后向下压住纱管"],"answer":[0],"explanation":"知识点：细纱抵管接头操作法。抵管接头的核心是右手将纱头绕导纱钩后向上抵住纱管，使纱头与管纱头在管顶接触加捻。错误项：直接对准管顶捻接缺少绕导纱钩的控制环节；夹在指间再贴管是另一种手法的部分动作，抵管法不这样操作；向下压住纱管与抵管接头动作方向相反。","tier":"进阶"},{"id":22,"type":"single","stem":"细纱机断头后，如果断头发生在纺纱段中上部且纱尾呈卷曲状，最可能的原因是","options":["纱条捻度不足","纱条捻度过度","导纱钩位置偏低","钢领板升降失灵"],"answer":[0],"explanation":"知识点：细纱断头形态与原因对应。纺纱段中上部断头且纱尾卷曲，说明纱条在加捻过程中捻度不足以承受张力，属捻度不足。错误项：捻度过度会使纱条发硬、断头在加捻点附近；导纱钩偏低改变气圈形态，断口位置不同；钢领板升降失灵造成管纱成形不良，不是该断口特征。","tier":"进阶"},{"id":23,"type":"single","stem":"细纱值车工在交接班时，对机台上正在纺的品种进行核对，以下哪项内容属于必须交接的工艺参数","options":["前罗拉速度与捻度齿轮牙数","粗纱定量与细纱管色","车间温湿度与照明","机台清洁与地面卫生"],"answer":[0],"explanation":"知识点：细纱交接班工艺核对内容。前罗拉速度与捻度齿轮牙数直接决定细纱号数与捻度，是必须交接的工艺参数。错误项：粗纱定量属于前道工序参数，管色是标识；温湿度与照明属于环境条件；清洁卫生属于现场管理，均不属于工艺参数交接核心。","tier":"挑战"},{"id":24,"type":"single","stem":"挡车工在巡回中发现细纱机某节罗拉座处有须条缠绕，正确的处置顺序是","options":["先关车再清除缠绕物并检查罗拉隔距","直接用手拉断缠绕须条继续开机","先降速运行再停机清理","先通知修机工再自行清理"],"answer":[0],"explanation":"知识点：细纱机罗拉缠绕处置程序。缠绕须条会影响牵伸，应先关车，清除后检查罗拉隔距是否走动，确认正常再开机。错误项：直接拉断继续开机可能损伤罗拉或造成纱疵；先降速运行仍带隐患；先通知修机工再自行清理顺序颠倒，应先停车防止事故扩大。","tier":"挑战"},{"id":25,"type":"single","stem":"细纱机钢领板每次升降动程的大小主要影响","options":["管纱的成形与卷绕密度","纱条的捻度大小","牵伸区的牵伸倍数","粗纱的退绕张力"],"answer":[0],"explanation":"知识点：细纱卷绕成形。钢领板升降动程决定纱线在管纱上的卷绕位置，影响管纱成形与卷绕密度。错误项：捻度由锭速与前罗拉速度比决定；牵伸倍数由罗拉速度比决定；粗纱退绕张力由粗纱架与导纱部件决定，均与钢领板动程无直接关系。","tier":"基础"},{"id":26,"type":"single","stem":"细纱车间相对湿度偏低时，下列哪项现象最可能出现","options":["纱条蓬松、断头增多","纱条回潮率上升","钢领磨损加快","粗纱退绕张力减小"],"answer":[0],"explanation":"知识点：细纱车间温湿度对纺纱的影响。相对湿度偏低，纤维导电性差、纱条蓬松，断头增多。错误项：回潮率上升是湿度偏高；钢领磨损加快主要与速度、润滑有关；粗纱退绕张力减小与湿度偏低无直接因果。","tier":"基础"},{"id":27,"type":"single","stem":"细纱机在纺制涤棉混纺品种时，为减少缠罗拉现象，通常对前罗拉表面采取的措施是","options":["进行表面镀铬或喷涂处理","增大前罗拉直径","降低前罗拉加压","提高前罗拉速度"],"answer":[0],"explanation":"知识点：涤棉混纺细纱缠罗拉防治。涤纶纤维易产生静电，前罗拉表面镀铬或喷涂可改善抗缠绕性能。错误项：增大罗拉直径不解决缠绕；降低加压会削弱握持、影响牵伸；提高速度会加剧缠绕倾向。","tier":"进阶"},{"id":28,"type":"single","stem":"细纱挡车工在接头完成后，发现接头处纱线明显粗于正常纱，正确的处理是","options":["立即掐掉该接头重新接","保留接头继续纺纱","将接头处拉细后再纺","标记后等落纱时处理"],"answer":[0],"explanation":"知识点：细纱接头质量控制。接头过粗属不合格接头，必须掐掉重接，防止形成粗节纱疵。错误项：保留会流入成品造成质量事故；拉细后纺会损伤纱条；标记等落纱处理不能阻止粗节进入后续工序。","tier":"挑战"},{"id":29,"type":"single","stem":"细纱机进行接头操作时，拔管后引出的纱头应当怎样处理才符合操作规范","options":["用食指将纱头捻尖后穿入钢丝圈","直接捏住纱尾套入钢丝圈","将纱头绕在锭杆上再穿钢丝圈","把纱头打一个结后穿过钢丝圈"],"answer":[0],"explanation":"知识点是细纱接头前纱头处理。正确项把纱头捻尖便于顺利穿过钢丝圈并减少毛羽。直接套入易造成钢丝圈卡纱；绕锭杆会破坏气圈形态；打结会在布面形成结头疵点。","tier":"进阶"},{"id":30,"type":"single","stem":"细纱机在正常纺纱时出现个别锭子断头，挡车工首先应做的是","options":["立即关停整台机器再逐锭排查","先拔起该锭纱管找出断头原因","把该锭的粗纱扯断后重新生头","等巡回时再统一处理该断头"],"answer":[1],"explanation":"知识点是断头处理程序。正确项先拔管找原因是规范操作，可判断是钢丝圈、锭子还是粗纱问题。关停整机影响产量；扯断粗纱会浪费且掩盖原因；延迟处理会造成邻锭缠绕。","tier":"基础"},{"id":31,"type":"single","stem":"细纱机牵伸区中，粗纱经后罗拉、中罗拉、前罗拉逐步抽长拉细，其中起主要牵伸作用的是","options":["后罗拉与中罗拉之间的区域","中罗拉与前罗拉之间的区域","前罗拉与导纱钩之间的区域","后罗拉与导纱喇叭之间的区域"],"answer":[1],"explanation":"知识点是细纱机牵伸区功能。主牵伸区在中罗拉与前罗拉之间，承担大部分牵伸倍数。后中罗拉间为预牵伸区；前罗拉外为加捻卷绕区；后罗拉外为喂入区。","tier":"进阶"},{"id":32,"type":"single","stem":"细纱挡车工在巡回中发现某锭纱的条干明显比邻锭粗，最可能的原因是","options":["该锭钢丝圈偏轻导致气圈过大","该锭粗纱喂入出现双根或粗节","该锭锭速偏高使捻度偏大","该锭导纱钩位置偏高使张力偏小"],"answer":[1],"explanation":"知识点是条干异常判断。纱条偏粗多因喂入粗纱双根或粗节。钢丝圈偏轻影响张力气圈不直接增粗；锭速偏高影响捻度；导纱钩偏高影响张力，均不直接造成条干粗。","tier":"挑战"},{"id":33,"type":"single","stem":"细纱机钢丝圈号数选择时，若纺纱张力偏大、断头增多，在其他条件不变时应当","options":["换用号数较小的钢丝圈","换用号数较大的钢丝圈","增加锭速以平衡张力","减少粗纱捻度以降低张力"],"answer":[0],"explanation":"知识点是钢丝圈号数与张力关系。号数小则钢丝圈轻，离心力小张力降低，可减少断头。号数大张力更大；加锭速张力更高；减粗纱捻度影响成纱质量且不解决张力。","tier":"进阶"},{"id":34,"type":"single","stem":"细纱机锭子与筒管配合时，筒管未插到底会造成的主要影响是","options":["纱管在锭子上跳动使卷绕成形不良","粗纱喂入张力增大导致条干恶化","钢丝圈运行速度下降使捻度不足","导纱钩与锭子中心偏移使气圈变形"],"answer":[0],"explanation":"知识点是筒管安装要求。未插到底则筒管跳动，卷绕成形差且易断头。粗纱喂入张力由牵伸区决定；钢丝圈速度由锭速决定；导纱钩偏移与筒管插入无关。","tier":"进阶"},{"id":35,"type":"single","stem":"细纱车间相对湿度过低时，对细纱工序最直接的影响是","options":["纱线强力上升断头减少","飞花增多且断头率升高","钢丝圈磨损加快捻度下降","粗纱回潮增大牵伸力下降"],"answer":[1],"explanation":"知识点是车间温湿度对纺纱的影响。湿度过低纤维抱合差、飞花多、静电大，断头率升高。强力一般下降而非上升；钢丝圈磨损与捻度不由湿度直接决定；低湿下回潮减小而非增大。","tier":"进阶"},{"id":36,"type":"single","stem":"细纱机进行落纱后重新开车，挡车工应重点检查的内容是","options":["粗纱吊锭是否转动灵活及纱尾是否理顺","锭带张力是否均匀及筒管是否插到底","牵伸齿轮是否啮合及罗拉隔距是否准确","吸棉管是否堵塞及风机转向是否正确"],"answer":[1],"explanation":"知识点是落纱后开车检查重点。落纱换管后最易出现筒管未插实和锭带异常，直接影响卷绕。吊锭与纱尾属巡回内容；牵伸齿轮隔距为平车项目；吸棉管风机属设备保全项目。","tier":"进阶"},{"id":37,"type":"single","stem":"细纱机纺纱过程中出现大面积断头且断口呈须状，最可能的原因是","options":["钢丝圈号数偏大张力过高","粗纱捻度偏小使须条松散","锭速偏低使捻度传递不足","导纱钩磨损使纱线被割断"],"answer":[1],"explanation":"知识点是断头断口形态判断。断口呈须状说明须条在加捻前就松散断裂，多因粗纱捻度偏小。钢丝圈偏大断口较齐；锭速偏低影响捻度不直接断须；导纱钩磨损断口有割痕。","tier":"进阶"},{"id":38,"type":"single","stem":"某挡车工在巡回时发现一锭纱管下端出现冒纱，正确的处置方法是","options":["继续纺纱待落纱时统一处理","立即拔管清除冒纱后重新生头","调低该锭锭速减小气圈张力","更换该锭钢丝圈后继续纺纱"],"answer":[1],"explanation":"知识点是冒纱异常处置。冒纱说明卷绕失控，须立即拔管清除重新生头，否则影响成形和邻锭。继续纺纱会加剧；调锭速和换钢丝圈均不能解决已冒纱的卷绕问题。","tier":"挑战"},{"id":39,"type":"single","stem":"细纱机前罗拉与导纱钩之间纱线张力过大时，最可能出现的现象是","options":["气圈高度降低且纱线易断","气圈高度增大且张力减小","钢丝圈运行平稳且断头减少","纱线捻度增大且强力提高"],"answer":[0],"explanation":"知识点是纺纱张力与气圈关系。张力过大时气圈被拉低，纱线易断。气圈增大是张力偏小的表现；张力大不会使钢丝圈更平稳；捻度由锭速与输出速度决定。","tier":"进阶"},{"id":40,"type":"single","stem":"细纱机挡车工在巡回中发现管纱成形出现葫芦形，下列处置顺序中最合理的是","options":["先调整成形凸轮再落纱观察","先落纱再检查钢领板和叶子板位置","先通知保全工再继续生产","先减小锭速再调整张力"],"answer":[1],"explanation":"知识点为细纱成形异常的处置程序。葫芦形多因钢领板升降动程或叶子板位置异常，正确做法是先落纱停机再检查相关机件，避免继续产出坏纱。调整成形凸轮属于进阶维修，不应在未确认原因前先动；通知保全工前应先落纱止损；锭速与葫芦形无直接因果关系，减小锭速只是掩盖问题。","tier":"挑战"},{"id":41,"type":"single","stem":"细纱接头时，下列哪一步是决定接头强力最关键的环节","options":["解捻后纤维的平行顺直","接头后纱线外观的毛羽数量","接头速度是否快于邻锭","接头用纱尾是否有色差"],"answer":[0],"explanation":"知识点为细纱接头强力的形成机理。接头强力主要取决于解捻后两段纤维是否平行顺直并良好搭接，纤维排列紊乱则强力低。毛羽数量是外观指标而非强力主因；速度影响效率但不决定强力；色差与强力无关。","tier":"进阶"},{"id":42,"type":"single","stem":"某挡车工在处理断头时，发现断口呈明显须状且纤维散乱，最可能的原因是","options":["钢丝圈过重造成张力过大","锭子速度偏低造成捻度不足","牵伸区须条被罗拉意外切断","钢丝圈飞脱造成瞬间失控"],"answer":[2],"explanation":"知识点为断头断口形态与原因的对应关系。须状散乱断口说明须条在牵伸区被切断，纤维未加捻。钢丝圈过重断口多整齐且发生在卷绕区；锭速偏低捻度不足断口多为细节断；钢丝圈飞脱断口位置和形态与牵伸切断不同。","tier":"挑战"},{"id":43,"type":"single","stem":"细纱机采用较大后区牵伸时，对成纱质量最直接的影响是","options":["成纱条干不匀率上升","成纱捻度明显增大","成纱强力明显提高","成纱毛羽明显减少"],"answer":[0],"explanation":"知识点为牵伸工艺参数对成纱质量的影响。后区牵伸过大使纤维运动失控，条干不匀率上升。捻度由锭速和输出速度决定，与后区牵伸无直接关系；后区牵伸过大通常不利于强力；毛羽与牵伸分配有关但后区牵伸过大不会使毛羽减少。","tier":"进阶"},{"id":44,"type":"single","stem":"挡车工在接班检查时发现相邻两锭的纱管成形松紧差异明显，应先重点核查","options":["两锭的锭带张力和锭速是否一致","两锭的钢丝圈型号是否相同","两锭的粗纱定量是否相同","两锭的纲领板高度是否相同"],"answer":[0],"explanation":"知识点为卷绕成形松紧差异的常见原因。锭带张力不一致会导致锭速差异，直接影响卷绕松紧。钢丝圈型号、粗纱定量、纲领板高度在同台同品种中通常一致，不是首要核查对象。","tier":"挑战"},{"id":45,"type":"single","stem":"细纱工序中，下列哪项操作最符合“清洁器隔距”调整的正确做法","options":["按品种和纱线号数调整隔距后试纺验证","统一按最大隔距安装以减少摩擦","根据挡车工手感随时调整隔距","每落纱后重新调整一次隔距"],"answer":[0],"explanation":"知识点为清洁器隔距的正确调整原则。隔距应依据品种和纱号设定并通过试纺验证。统一按最大隔距安装会降低清洁效果；凭手感随时调整缺乏依据；每落纱后重调既无必要也增加波动。","tier":"进阶"},{"id":46,"type":"single","stem":"挡车工在巡回中发现某锭纱线出现周期性粗节，最可能的原因是","options":["该锭钢丝圈磨损严重","该锭粗纱有周期性疵点","该锭锭带打滑","该锭叶子板位置偏高"],"answer":[1],"explanation":"知识点为周期性粗节的来源判断。周期性粗节多由粗纱本身的周期性疵点造成，经牵伸后仍保留规律性。钢丝圈磨损、锭带打滑、叶子板位置偏高均不会产生周期性粗节。","tier":"进阶"},{"id":47,"type":"single","stem":"细纱落纱后重新生头时，下列哪项做法最有利于减少生头断头","options":["先低速生头再逐步升速","直接按正常锭速生头","生头前先松开锭带","生头时加大钢丝圈号数"],"answer":[0],"explanation":"知识点为生头操作与断头的关系。先低速生头可使纱线逐步建立张力，减少瞬时冲击断头。直接按正常锭速生头冲击大易断；松开锭带无法生头；加大钢丝圈号数会增大张力，不利生头。","tier":"进阶"},{"id":48,"type":"single","stem":"细纱机纺纯棉中特纱时，后区牵伸倍数偏大最可能直接造成下列哪项成纱质量恶化","options":["成纱条干不匀率升高","成纱强力不匀率下降","成纱棉结去除率提高","成纱捻度不匀率下降"],"answer":[0],"explanation":"知识点是细纱机牵伸分配对成纱条干的影响：后区牵伸倍数偏大时，后区对须条的握持力不足，纤维变速点分散，导致条干不匀率升高。正确项对在：后区牵伸过大破坏须条结构，条干恶化是直接后果。错误项一：后区牵伸偏大通常使强力不匀率升高而非下降；错误项二：后区牵伸偏大不利于棉结去除，去除率不会因此提高；错误项三：捻度不匀主要与锭速、钢丝圈及捻度机构有关，不是后区牵伸偏大的直接结果。","tier":"进阶"},{"id":49,"type":"single","stem":"细纱挡车工在巡回中发现某锭位断头后纱尾呈卷曲状且纤维松散，而相邻锭位断头纱尾较整齐，最合理的下一步处置是","options":["先检查该锭位粗纱是否跑空或吊锭回转不灵","先调整该锭位钢丝圈号数再重新接头","先降低整台车锭速再逐一接头","先给该锭位加装导纱钩再接头"],"answer":[0],"explanation":"知识点是断头形态与故障原因的对应：纱尾卷曲、纤维松散多与粗纱喂入异常（跑空、吊锭回转不灵、粗纱通道不畅）有关。正确项对在：先查粗纱喂入环节，能定位断头根因再处理，避免盲目调其他参数。错误项一：钢丝圈号数影响张力与气圈，不是该形态断头的首选排查点；错误项二：整台降速会掩盖单锭问题并影响产量与质量；错误项三：导纱钩加装不是常规处置，且不针对该断头形态。","tier":"挑战"},{"id":50,"type":"multi","stem":"某细纱班组交接班时发现同一台车左侧成纱毛羽明显多于右侧，下列排查方向中合理的有","options":["比较左右两侧锭带张力与锭子振动情况","比较左右两侧钢丝圈使用周期与磨损程度","比较左右两侧粗纱吊锭回转灵活性与粗纱通道状态","比较左右两侧细纱机牵伸齿轮箱油位与温度","比较左右两侧车间送排风气流方向与风速"],"answer":[0,1,2],"explanation":"知识点是细纱毛羽差异的多因素排查：锭带张力与锭子振动、钢丝圈磨损、粗纱吊锭与通道状态都会影响毛羽。正确项对在：这三项直接关系加捻卷绕稳定性和须条喂入质量。错误项一：牵伸齿轮箱油位与温度影响传动与机械状态，通常不表现为左右毛羽系统性差异；错误项二：车间气流会影响毛羽，但左右两侧同处一台车，气流方向与风速不是该对比的首选排查项。","tier":"挑战"},{"id":51,"type":"single","stem":"细纱机挡车工在巡回中发现锭子上出现细纱断头，正确的接头顺序是","options":["先拔管取纱头，再找筒纱头，然后引纱穿导纱钩","先找筒纱头，再拔管取纱头，然后引纱穿导纱钩","先引纱穿导纱钩，再拔管取纱头，然后找筒纱头","先拔管取纱头，再引纱穿导纱钩，然后找筒纱头"],"answer":[0],"explanation":"知识点是细纱接头操作程序。正确顺序为拔管取出纺纱端纱头、找出筒纱上的断头、引纱穿导纱钩完成接头。先找筒纱头再拔管，顺序颠倒会延长断头时间；先穿导纱钩再拔管，纱头未取无法引纱；先拔管再穿导纱钩后找筒纱头，中间环节错位会造成纱线缠绕。"},{"id":52,"type":"single","stem":"细纱机运转中锭子出现跳动、纱线气圈明显变大，最应该优先检查的部位是","options":["锭带张力是否过松","粗纱定量是否偏大","钢领板升降是否到位","车间温湿度是否偏低"],"answer":[0],"explanation":"知识点是锭子异常运转的判断。锭带张力过松会导致锭速不稳、锭子跳动、气圈异常，是首要排查点。粗纱定量偏大影响牵伸但不会直接引起锭子跳动；钢领板升降不到位影响卷绕成形而非气圈；温湿度偏低主要影响断头和静电，不是锭子跳动的直接原因。"},{"id":53,"type":"single","stem":"细纱接头时，退捻加捻操作的关键要求是","options":["退捻长度与加捻长度相当，接头处捻度接近原纱","退捻长度要明显大于加捻长度以保证牢固","加捻长度要明显大于退捻长度以增加强力","退捻加捻均尽量短以免影响条干"],"answer":[0],"explanation":"知识点是细纱接头退捻加捻的配合。正确做法是退捻长度与加捻长度相当，使接头处捻度接近原纱，保证强力与外观。退捻大于加捻会使接头处捻度不足；加捻大于退捻会使接头处过捻形成疙瘩；两者都过短则接头强力不够易滑脱。"},{"id":54,"type":"single","stem":"细纱车间挡车工在巡回中处理断头，以下做法正确的是","options":["先处理影响面大的断头，再处理个别断头","先处理离自己最近的断头，再向远处推进","先处理粗纱用完的锭位，再处理断头锭位","先处理锭速异常的锭位，再处理断头锭位"],"answer":[0],"explanation":"知识点是细纱巡回处理原则。应按影响面大小安排，先处理影响面大的断头以减少连锁断头和空锭。按距离远近处理忽视影响面；先处理粗纱用完锭位会延误断头处理；先处理锭速异常锭位同样会延误主要断头，均不符合巡回工作法。"},{"id":55,"type":"single","stem":"细纱机牵伸区出现纱线出硬头，最可能的原因是","options":["牵伸罗拉隔距偏小或粗纱捻度偏大","牵伸罗拉隔距偏大或粗纱捻度偏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"等落纱时统一清理飞花","通知保全工调整罗拉隔距"],"answer":[0],"explanation":"知识点是细纱机运转中飞花堆积的处理原则。飞花堆积会带入牵伸区造成断头或纱疵，正确做法是停车后清理，避免工具或手卷入罗拉。开车状态下用竹签挑飞花易被卷入造成伤害；等落纱统一清理会使飞花持续带入牵伸区；通知保全工调整罗拉隔距与飞花堆积无直接因果关系。"},{"id":93,"type":"single","stem":"细纱挡车工进行接头时，将纱尾与须条搭接后应完成的动作顺序是","options":["先引纱后加捻再送纱","先送纱后引纱再捻接","先加捻后引纱再送纱","先引纱后送纱再加捻"],"answer":[0],"explanation":"知识点是细纱接头的基本操作顺序。正确顺序是引纱、加捻、送纱，使纱尾与须条在捻度作用下牢固结合。先送纱会使须条提前输出难以控制；先加捻后引纱顺序颠倒无法形成有效接头；先引纱后送纱再加捻缺少加捻时机的配合。"},{"id":94,"type":"single","stem":"细纱机某锭子出现周期性粗节纱，检查牵伸区未发现明显问题，最可能的原因是","options":["锭带张力不足","前罗拉加压偏小","粗纱本身有周期性细节","钢领板升降不灵活"],"answer":[2],"explanation":"知识点是周期性粗节纱的成因判断。周期性粗节往往由喂入粗纱本身的周期性细节造成，经牵伸后仍保留周期性。锭带张力不足影响捻度而非周期性粗节；前罗拉加压偏小造成牵伸不匀但一般不呈周期性；钢领板升降不灵活影响卷绕成形而非粗节。"},{"id":95,"type":"single","stem":"细纱车间相对湿度偏低时，挡车工在操作上最应关注的变化是","options":["断头率上升且飞花增多","锭速自动升高","牵伸倍数自动增大","粗纱回潮率自动下降"],"answer":[0],"explanation":"知识点是温湿度对细纱生产的影响。湿度偏低使纤维抱合力下降，断头率上升且飞花增多，这是挡车工需重点关注的直接变化。锭速由传动决定不会自动升高；牵伸倍数由齿轮决定不会自动增大；粗纱回潮率变化是渐进过程且非挡车工操作关注点。"},{"id":96,"type":"single","stem":"挡车工在巡回中发现某锭子纱线出现连续细节，检查粗纱和牵伸区均正常，应进一步检查","options":["该锭子是否缺油或轴承磨损","车间照明是否充足","相邻锭子是否同样异常","粗纱吊锭是否转动灵活"],"answer":[0],"explanation":"知识点是连续细节的故障排查。牵伸和粗纱正常时，连续细节常因锭子缺油或轴承磨损导致转速波动。照明与纱线细节无因果关系；相邻锭子异常属另一类问题；粗纱吊锭转动灵活已在粗纱正常中排除。"},{"id":97,"type":"single","stem":"细纱机断头后，挡车工处理断头时先要做的第一步是","options":["找出断头原因并清除疵点","立即接头恢复生产","通知落纱工协助","调整该锭子捻度"],"answer":[0],"explanation":"知识点是断头处理的基本程序。正确程序是先找出断头原因并清除疵点，防止接头后再断或产生纱疵。立即接头可能掩盖问题导致重复断头；通知落纱工不是首要步骤；调整捻度不是断头后常规操作。"},{"id":98,"type":"single","stem":"细纱机牵伸区中，皮圈跑偏对成纱质量最直接的影响是","options":["产生条干不匀和粗细节","降低锭子转速","增大钢领磨损","减少飞花产生"],"answer":[0],"explanation":"知识点是皮圈跑偏的危害。皮圈跑偏使须条控制不良，直接造成条干不匀和粗细节。锭子转速由传动决定与皮圈无关；钢领磨损与皮圈跑偏无直接关系；飞花产生与皮圈跑偏无必然减少关系。"},{"id":99,"type":"single","stem":"细纱挡车工在巡回操作中，合理的巡回路线应遵循的原则是","options":["按锭子排列方向依次不漏头","随意走动以节省体力","只走一侧便于观察","按断头多少决定路线"],"answer":[0],"explanation":"知识点是细纱巡回操作原则。合理路线是按锭子排列方向依次不漏头，保证每个锭子得到及时检查。随意走动会漏检锭子；只走一侧无法覆盖全部锭子；按断头多少决定路线缺乏计划性易漏检。"},{"id":100,"type":"single","stem":"细纱机某锭子出现纱线捻度偏小，检查锭带和锭子均正常，最可能的原因是","options":["该锭子罗拉握持力不足","该锭子导纱钩磨损","该锭子纱管松动","该锭子钢领磨损"],"answer":[0],"explanation":"知识点是捻度偏小的原因分析。锭带和锭子正常时，捻度偏小常因罗拉握持力不足导致须条滑移。导纱钩磨损影响纱线通道而非捻度；纱管松动影响卷绕而非捻度；钢领磨损影响卷绕成形而非捻度。"},{"id":101,"type":"single","stem":"细纱车间一名挡车工在交接班时发现上一班留下的某台车断头率明显偏高，正确的交接处置是","options":["记录异常情况并向班组长汇报","自行调整牵伸齿轮后再开车","直接开车待观察后再处理","等下一班处理并口头告知"],"answer":[0],"explanation":"知识点是交接班异常情况的处置。正确做法是记录异常并汇报，便于统一分析和处理。自行调整牵伸齿轮可能改变工艺参数；直接开车待观察可能造成批量纱疵；等下一班处理并口头告知不符合交接班规范。"},{"id":102,"type":"multi","stem":"细纱挡车工在接头操作中，为保证接头质量应做到的有","options":["接头前清除纱尾和须条上的疵点","接头动作轻快减少捻度损失","接头后检查接头处粗细是否合格","接头时尽量拉长搭接长度","接头后立即摘下纱管检查"],"answer":[0,1,2],"explanation":"知识点是接头质量的控制要点。清除疵点、动作轻快、接头后检查粗细均为保证接头质量的正确做法。拉长搭接长度会造成接头粗节不合格；接头后立即摘下纱管检查会打断正常生产且无必要。"},{"id":103,"type":"single","stem":"细纱机开车时，锭带张力过松最容易直接引起的现象是","options":["锭子转速偏低且成纱捻度不足","筒管顶部纱线出现毛羽增多","牵伸罗拉表面出现绕花","导纱钩位置偏移导致气圈变形"],"answer":[0],"explanation":"知识点：锭带传动与捻度关系。锭带松弛使锭子实际转速低于设定值，单位时间加捻数减少，造成捻度不足；锭子转速偏低是直接后果。选项B毛羽增多多与钢丝圈、导纱钩磨损或温湿度有关，锭带松不是首要原因；选项C绕花是牵伸区清洁或皮辊皮圈问题；选项D导纱钩偏移与锭带张力无直接传动关系。"},{"id":104,"type":"single","stem":"细纱挡车工在接头时，如果纤维须条搭接长度过短，最可能导致","options":["接头处纱线强力明显偏低","接头处纱线直径明显变粗","接头处纱线捻度明显偏高","接头处纱线颜色明显变深"],"answer":[0],"explanation":"知识点：接头搭接长度与强力关系。搭接长度不足时，纤维相互抱合和缠绕的根数少，接头处强力下降，容易在后续工序断头。选项B直径变粗通常是搭接纤维过多或捻度不匀造成；选项C捻度偏高与接头时加捻动作过多有关，不是搭接短的主要结果；选项D颜色变化属于原料或混纺问题，与搭接长度无直接关系。"},{"id":105,"type":"single","stem":"细纱工序中，钢丝圈号数选择偏小（重量偏轻）时，最可能出现的情况是","options":["气圈膨大且断头率上升","纱线张力增大且捻度偏高","钢丝圈磨损加快且寿命缩短","筒管卷绕密度明显增大"],"answer":[0],"explanation":"知识点：钢丝圈号数与气圈、张力关系。钢丝圈偏轻时离心力不足，气圈鼓胀变大，纱线张力波动，断头增多。选项B张力增大是钢丝圈偏重时的表现；选项C磨损加快多与钢丝圈偏重、速度过高或润滑不良有关；选项D卷绕密度增大与卷绕张力增大有关，也偏向钢丝圈偏重的情况。"},{"id":106,"type":"single","stem":"细纱机牵伸区中，皮辊表面出现周期性凹陷，最可能直接造成","options":["成纱出现规律性粗细节","成纱出现大面积毛羽","成纱出现连续色差","成纱出现整段捻度不匀"],"answer":[0],"explanation":"知识点：牵伸部件缺陷与纱疵对应关系。皮辊周期性凹陷使钳口握持力周期性变化，牵伸不匀，形成规律性粗细节。选项B大面积毛羽多与钢丝圈、导纱钩或车间温湿度有关；选项C连续色差属于原料或混配问题；选项D整段捻度不匀通常与锭带、锭子传动异常有关，不是皮辊局部凹陷的典型表现。"},{"id":107,"type":"single","stem":"细纱挡车工巡回中发现某锭子纱线断头后，正确的首要处置动作是","options":["先关停该锭子再清理断头处积花","立即用钩刀割断相邻锭子纱线","先加大该锭子牵伸倍数再接头","直接用手拉出罗拉间须条继续纺纱"],"answer":[0],"explanation":"知识点：断头处理程序。断头后应先停止该锭输出，防止继续缠绕或积花，再清理断头处积花后接头。选项B割断相邻纱线会扩大断头范围，属于错误处置；选项C断头与牵伸倍数无直接关系，随意调整会破坏工艺；选项D不经清理直接拉须条容易造成粗节和再次断头。"},{"id":108,"type":"single","stem":"细纱机罗拉隔距调整的主要依据是","options":["纤维长度和牵伸型式","锭子转速和钢丝圈号数","筒管直径和卷绕密度","车间温湿度和纱线号数"],"answer":[0],"explanation":"知识点：罗拉隔距与纤维长度、牵伸型式匹配。隔距要根据纤维长度和牵伸机构型式确定，保证纤维在牵伸区受控。选项B锭速和钢丝圈号数属于加捻卷绕参数，不决定罗拉隔距；选项C筒管直径和卷绕密度属于卷绕工艺；选项D温湿度和纱线号数影响工艺但非隔距调整的主要依据。"},{"id":109,"type":"single","stem":"细纱车间相对湿度过低时，下列现象中最容易出现的是","options":["纱线毛羽增多且断头率上升","纱线回潮率明显偏高","钢丝圈磨损明显减慢","皮辊表面容易产生绕花"],"answer":[0],"explanation":"知识点：车间温湿度对细纱的影响。湿度过低时纤维抱合力差、静电增多，毛羽增多，断头率上升。选项B回潮率偏高是湿度偏高时的表现；选项C钢丝圈磨损减慢与湿度低无直接对应，润滑和速度影响更大；选项D皮辊绕花多与湿度过高、皮辊表面状态差有关。"},{"id":110,"type":"single","stem":"细纱机在正常纺纱时，导纱钩的作用是","options":["控制气圈形态并稳定纱线张力","对纱线进行加捻并调节捻度","握持纤维须条并控制牵伸倍数","卷绕纱线并形成筒管成形"],"answer":[0],"explanation":"知识点：导纱钩功能。导纱钩位于锭子与钢丝圈之间，主要作用是限制气圈、稳定纱线张力和减少断头。选项B加捻是锭子与钢丝圈配合完成，导纱钩不调节捻度；选项C握持须条是罗拉钳口的功能；选项D卷绕成形由筒管和成形机构完成。"},{"id":111,"type":"single","stem":"细纱机牵伸区中，上下皮圈运行速度不一致且皮圈张力偏松，最可能产生的纱疵是","options":["竹节纱或粗细节增多","纱线捻度整体偏高","纱线强力整体上升","筒管成形不良"],"answer":[0],"explanation":"知识点：皮圈牵伸与纱疵。皮圈张力松、上下皮圈速度不一致会造成牵伸不匀，形成竹节或粗细节。选项B捻度整体偏高与锭子转速、钢丝圈配置有关；选项C强力整体上升不会由皮圈张力松引起，反而会下降；选项D筒管成形不良属于卷绕机构问题。"},{"id":112,"type":"single","stem":"细纱挡车工在交接班时发现上一班留下的纱线捻度偏大，最合理的处理方式是","options":["先核对锭速、钢丝圈和捻度设定再决定是否调整","直接降低锭子转速以减小捻度","立即更换所有钢丝圈以降低捻度","加大牵伸倍数使纱线变细来补偿捻度"],"answer":[0],"explanation":"知识点：捻度异常的排查程序。捻度偏大应先核对工艺参数，如锭速、钢丝圈号数、捻度设定，找出原因再调整。选项B直接降锭速可能影响产量且未查清原因；选项C更换全部钢丝圈成本高且未必对症；选项D加大牵伸会改变纱线号数，不能作为解决捻度偏大的常规手段。"},{"id":113,"type":"single","stem":"细纱机开车生头时，纱条从喇叭口喂入后应首先经过哪个牵伸部件才能进入前罗拉钳口？","options":["后罗拉钳口","中罗拉钳口","前罗拉钳口","导纱钩"],"answer":[0],"explanation":"知识点：细纱机牵伸装置的纱条走向。正确项：纱条先经喇叭口进入后罗拉钳口，再经中罗拉、前罗拉逐级牵伸。错误项：中罗拉钳口是第二牵伸区入口，不是首先经过处；前罗拉钳口是牵伸输出端，纱条不会先到这里；导纱钩在加捻卷绕区，不属于牵伸部件。"},{"id":114,"type":"single","stem":"细纱接头时，将纱条捻入的接头长度一般控制在多少毫米范围较为合适？","options":["5～8","15～20","30～35","45～50"],"answer":[1],"explanation":"知识点：细纱接头长度控制。正确项：接头长度通常控制在15～20毫米，既能保证接头强力又不过粗。错误项：5～8毫米过短，捻合不牢易脱结；30～35毫米过长，接头粗节明显影响条干；45～50毫米过长，形成明显粗节且浪费原料。"},{"id":115,"type":"single","stem":"细纱机断头后，锭子仍在回转而纱条已断开，挡车工首先应做的是哪个动作？","options":["立即关停该锭子","提起纱管取断头纱","用剪刀剪去断头纱尾","先处理相邻锭子断头"],"answer":[0],"explanation":"知识点：细纱断头处理程序。正确项：断头后应先关停该锭子，防止纱尾缠绕罗拉或造成飞纱。错误项：锭子未停就取断头纱易被回丝缠绕伤手；剪去纱尾应在停锭后进行；先处理相邻锭子会延误本锭处理造成更多缠绕。"},{"id":116,"type":"single","stem":"细纱机牵伸区中，皮圈钳口对纱条的作用主要是什么？","options":["增加纱条捻度","控制纤维运动减少浮游","对纱条进行加湿","对纱条进行清洁"],"answer":[1],"explanation":"知识点：皮圈牵伸原理。正确项：皮圈钳口控制纤维运动，减少浮游纤维，改善条干均匀度。错误项：捻度由锭子加捻产生，不在牵伸区；加湿由专门装置或车间空调完成；皮圈不承担清洁纱条功能。"},{"id":117,"type":"single","stem":"细纱机生产中，前罗拉钳口与导纱钩之间的纱条被称为哪一段？","options":["牵伸区纱条","加捻三角区纱条","卷绕区纱条","喂入区纱条"],"answer":[1],"explanation":"知识点：细纱机纱条分段名称。正确项：前罗拉钳口到导纱钩之间为加捻三角区，是捻度传递和断头多发区。错误项：牵伸区在前罗拉之前；卷绕区在导纱钩之后到纱管；喂入区在喇叭口之前。"},{"id":118,"type":"single","stem":"细纱机落纱后重新开车，挡车工发现个别锭子纱条捻度偏小，应优先检查哪个部位？","options":["锭带张力是否松弛","粗纱定量是否偏大","车间温湿度是否偏高","钢领板升降是否正常"],"answer":[0],"explanation":"知识点：细纱捻度偏小的原因排查。正确项：锭带张力松弛会使锭子转速下降，捻度偏小。错误项：粗纱定量偏大影响牵伸而非捻度；温湿度偏高主要影响断头和毛羽；钢领板升降影响卷绕成形不影响捻度。"},{"id":119,"type":"single","stem":"细纱机接头操作中，采用“解捻接头法”时，正确的操作顺序是哪个？","options":["先解捻再搭头后捻接","先搭头再解捻后捻接","先捻接再解捻后搭头","先剪断再搭头后解捻"],"answer":[0],"explanation":"知识点：解捻接头法操作顺序。正确项：先对断头纱尾解捻，再与管纱纱头搭接，最后捻接成接头。错误项：先搭头无法有效解捻；先捻接后解捻顺序颠倒；先剪断会浪费纱条且解捻无对象。"},{"id":120,"type":"single","stem":"细纱车间相对湿度偏低时，细纱断头率通常会怎样变化？","options":["断头率下降","断头率上升","断头率不变","断头率先降后升"],"answer":[1],"explanation":"知识点：温湿度对细纱断头的影响。正确项：湿度偏低使纤维抱合力下降、静电增加，断头率上升。错误项：湿度偏低不会使断头下降；断头率不会保持不变；先降后升不符合实际规律。"},{"id":121,"type":"single","stem":"细纱机钢领与钢丝圈之间的配合状态直接影响哪个指标？","options":["牵伸效率","捻度大小","毛羽和断头","粗纱定量"],"answer":[2],"explanation":"知识点：钢领钢丝圈配合的作用。正确项：钢领与钢丝圈配合影响纱线毛羽和断头。错误项：牵伸效率由牵伸装置决定；捻度由锭子转速决定；粗纱定量由前道工序决定。"},{"id":122,"type":"single","stem":"某挡车工在细纱机正常生产中听到个别锭子有异常摩擦声，且该锭纱条毛羽明显增多，最恰当的处置是哪个？","options":["继续观察待交班时处理","立即停锭检查钢丝圈和钢领","加大该锭粗纱喂入量","调低该锭锭速后继续生产"],"answer":[1],"explanation":"知识点：细纱异常锭子的现场处置。正确项：异常摩擦声伴毛羽增多，多因钢丝圈磨损或钢领不良，应立即停锭检查。错误项：继续观察会恶化并影响邻锭；加大粗纱喂入不解决摩擦问题；调低锭速只是掩盖现象不能消除故障。"},{"id":123,"type":"single","stem":"细纱机开车时，锭子与筒管配合不良会导致纱线出现哪种主要疵点","options":["竹节纱","弱捻纱","毛羽纱","松纱"],"answer":[3],"explanation":"知识点：锭子与筒管配合影响卷绕成形。筒管跳动或锭子磨损会使纱线卷绕张力不稳，形成松纱。竹节纱多因牵伸不良造成；弱捻纱与锭速和钢丝圈配置有关；毛羽纱与钢领、钢丝圈状态及导纱部件有关。"},{"id":124,"type":"single","stem":"细纱车间挡车工进行接头时，下列哪一步骤直接影响接头强力","options":["引纱长度控制在合理范围","接头速度尽量加快","手指湿度保持较高","纱尾留头尽量加长"],"answer":[0],"explanation":"知识点：细纱接头质量取决于纱尾搭接长度和加捻效果。引纱长度合理能使纱尾与须条充分搭接，保证接头强力。接头速度过快易造成搭接不实；手指过湿会影响纤维抱合；纱尾留头过长反而增加细节。"},{"id":125,"type":"single","stem":"细纱机断头后，挡车工发现断头处纱尾呈明显卷曲状且捻度偏高，最可能的原因是","options":["牵伸区须条过粗","钢丝圈过轻","锭速突然降低","导纱钩位置偏高"],"answer":[2],"explanation":"知识点：断头形态可判断原因。锭速突然降低时，纱线捻度来不及均匀分布，断头处纱尾卷曲且捻度偏高。须条过粗造成粗节断头；钢丝圈过轻使张力不足；导纱钩偏高影响气圈形态。"},{"id":126,"type":"single","stem":"细纱机牵伸区中，后区牵伸倍数过大时，成纱质量最可能出现的变化是","options":["条干不匀率上升","纱线强力提高","捻度不匀率下降","毛羽数量减少"],"answer":[0],"explanation":"知识点：后区牵伸倍数影响牵伸效率。后区牵伸过大时，纤维运动控制不良，条干不匀率上升。后区牵伸过大不会提高强力，反而可能降低；捻度不匀与后区牵伸无直接关系；毛羽一般不会因此减少。"},{"id":127,"type":"single","stem":"细纱机钢领与钢丝圈配合中，钢丝圈号数选择偏大时，纱线张力会出现什么变化","options":["张力减小，气圈变大","张力增大，气圈变小","张力不变，气圈不变","张力先减小后增大"],"answer":[1],"explanation":"知识点：钢丝圈号数越大，重量越大，纱线张力越大。张力增大使气圈变小。钢丝圈号数偏大不会使张力减小；张力不变或先减后增不符合实际规律。"},{"id":128,"type":"single","stem":"细纱机开车时，锭带张力过松会导致锭子转速出现哪种异常","options":["锭速偏高且波动","锭速偏低且稳定","锭速偏低且波动","锭速偏高且稳定"],"answer":[2],"explanation":"知识点：锭带张力影响锭子传动效率。锭带过松时，锭子转速偏低且因打滑而波动。锭速偏高与锭带过松无关；锭速偏低且稳定不符合打滑特征；锭速偏高且稳定更不可能。"},{"id":129,"type":"single","stem":"细纱机接头操作中，采用“抵管接头法”时，纱尾应放置在什么位置","options":["锭杆顶部","筒管中部","钢丝圈内侧","导纱钩上方"],"answer":[2],"explanation":"知识点：抵管接头法要求纱尾抵住筒管并靠近钢丝圈内侧，利用锭子回转加捻。锭杆顶部、筒管中部、导纱钩上方均不是抵管接头的正确位置。"},{"id":130,"type":"single","stem":"细纱机断头后，挡车工在接头前应先做哪项检查","options":["检查钢丝圈是否磨损或脱落","检查粗纱是否用完","检查锭带是否断裂","检查导纱钩是否松动"],"answer":[0],"explanation":"知识点：断头后接头前应先检查钢丝圈状态，因钢丝圈磨损或脱落是断头常见原因。粗纱是否用完、锭带是否断裂、导纱钩是否松动不是每次接头前必查项，且与断头直接原因关联度低。"},{"id":131,"type":"single","stem":"细纱机采用“大牵伸”工艺时，为控制纤维运动，通常应在牵伸区增加什么装置","options":["集合器","压力棒","导纱钩","隔距块"],"answer":[1],"explanation":"知识点：大牵伸工艺中，压力棒可有效控制牵伸区纤维运动，改善条干。集合器用于收束须条；导纱钩用于引导纱线；隔距块用于控制皮辊隔距，不直接控制纤维运动。"},{"id":132,"type":"single","stem":"细纱机开车后纱线断头，锭子仍高速回转，挡车工首先应做的操作是","options":["立即拔下纱管再找断头","先关车再拔出纱管处理","用剪刀剪断缠绕的须条","直接用手拉住纱头往锭盘上绕"],"answer":[1],"explanation":"知识点是断头后的安全处理程序。断头后锭子高速回转，必须先关车或降低车速才能拔管，否则易伤手且纱管飞出；立即拔管和用手拉纱头都违反安全操作；剪断缠绕须条不能解决锭子回转的危险。"},{"id":133,"type":"single","stem":"细纱接头时，将纱头与须条搭接后捻接动作的关键要求是","options":["搭接长度越长越好以增加强力","搭接后立即快速加捻并顺向搓捻","搭接后先反向退捻再顺向加捻","接头处保留粗节以提高强度"],"answer":[2],"explanation":"知识点是细纱接头工艺。正确接头需先退捻使纤维松散再顺向加捻，使接头处纤维互相缠绕；搭接过长会形成粗节；快速加捻不先退捻纤维不能充分抱合；保留粗节会影响条干均匀度。"},{"id":134,"type":"single","stem":"细纱机牵伸区中，皮辊表面出现周期性油污并伴随纱线出现规律性粗节，最可能的原因是","options":["皮辊加压不足导致握持力下降","皮辊表面绕花后未及时清理","罗拉隔距偏大造成牵伸不开","集合器位置偏前使须条扩散"],"answer":[1],"explanation":"知识点是牵伸部件异常判断。皮辊绕花后表面凹凸不平且带油污，会周期性影响握持，形成规律性粗节；加压不足多为条干恶化而非周期性；隔距偏大影响牵伸效率但不产生周期粗节；集合器偏前影响集束而非皮辊油污。"},{"id":135,"type":"single","stem":"细纱工序中，锭子与筒管配合过松，在高速运转时最容易出现的现象是","options":["纱管跳动并产生松纱脱圈","纱线张力过大导致断头","纲领板升降不灵活","导纱钩磨损加快"],"answer":[0],"explanation":"知识点是锭子与筒管配合对卷绕的影响。配合过松时筒管在锭子上跳动，卷绕张力不稳，易松纱脱圈；张力过大与配合过松无直接关系；纲领板升降由升降机构控制；导纱钩磨损与配合松紧无关。"},{"id":136,"type":"single","stem":"细纱机开车时，纲领板处于最低位置，此时纱线张力与卷绕直径的关系是","options":["卷绕直径最大、张力最小","卷绕直径最小、张力最大","卷绕直径最大、张力最大","卷绕直径最小、张力最小"],"answer":[1],"explanation":"知识点是卷绕成形中张力变化。纲领板最低时纱管底部卷绕直径最小，气圈高度大，纱线张力最大；随纲领板上升卷绕直径增大，张力逐渐减小。因此最低位对应直径最小张力最大。"},{"id":137,"type":"single","stem":"细纱挡车工在巡回中发现个别锭子纱线出现连续弱捻，捻度明显低于同台其他锭子，应优先检查","options":["该锭子锭带是否松弛或脱落","该锭子纲领板是否升降异常","该锭子导纱钩是否位置偏高","该锭子筒管是否颜色不一致"],"answer":[0],"explanation":"知识点是弱捻原因分析。锭带松弛或脱落使锭子转速下降，捻度随之降低；纲领板升降影响卷绕成形而非捻度；导纱钩位置偏高影响气圈和张力；筒管颜色与捻度无关。"},{"id":138,"type":"single","stem":"细纱接头操作中，退捻时拇指与食指的用力方向应为","options":["两指同向搓动使纱头松散","两指反向搓动使纱头退捻","两指垂直按压使纤维断裂","两指夹紧后快速拉断纱头"],"answer":[1],"explanation":"知识点是接头退捻手法。退捻需两指反向搓动使纱头纤维松散，便于后续搭接加捻；同向搓动是加捻方向；垂直按压和快速拉断都会损伤纤维或形成断头，不能形成合格接头。"},{"id":139,"type":"single","stem":"细纱机在运转中导纱钩出现明显沟槽，对纱线质量最直接的影响是","options":["纱线毛羽增加、条干恶化","纱线捻度明显增大","纱线号数明显偏粗","纱管成形直径变大"],"answer":[0],"explanation":"知识点是导纱钩磨损对纱线的影响。沟槽会刮擦纱线，使毛羽增加、条干恶化；捻度由锭子转速决定；号数由牵伸决定；纱管成形由升降机构决定，均与导纱钩沟槽无直接因果。"},{"id":140,"type":"single","stem":"细纱工序中，粗纱在牵伸区出现牵伸不开、出硬头，下列调整措施中最直接有效的是","options":["适当放大罗拉隔距","适当减小罗拉隔距","提高锭子转速","加大纲领板升降动程"],"answer":[1],"explanation":"知识点是牵伸不开的调整。出硬头多因隔距偏大或牵伸力不足，缩小罗拉隔距可增强握持、改善牵伸；放大隔距会加重牵伸不开；锭速和升降动程与牵伸不开无直接关系。"},{"id":141,"type":"single","stem":"某挡车工在交接班时发现上一班留下的纱管成形不良、两端冒纱，本班开车前正确的处置是","options":["直接继续开车待落纱时统一处理","先检查纲领板升降和成形机构再开车","把冒纱纱管挑出后单独落纱即可","降低锭速运行一个班次观察"],"answer":[1],"explanation":"知识点是交接班异常处置。两端冒纱多与纲领板升降、成形机构或张力控制有关，应先检查排除机构异常再开车；直接开车会继续产生坏管；单独落纱不解决机构问题；降速运行不能消除成形缺陷。"},{"id":142,"type":"multi","stem":"细纱机断头处理时，下列做法中符合操作规范的有","options":["先关车再拔纱管找断头","接头前先退捻使纤维松散","接头后检查接头强力再开车","断头后立即用手抓住回转纱管","接头时保留明显粗节以增加强度"],"answer":[0,1,2],"explanation":"知识点是断头处理与接头规范。先关车可避免伤手，退捻是接头必要步骤，接头后检查强力可防止再次断头；用手抓回转纱管违反安全；保留粗节影响条干均匀度，均不符合规范。"},{"id":143,"type":"single","stem":"细纱机牵伸区内粗纱须条在罗拉钳口间正常运行时，牵伸力主要取决于下列哪一因素","options":["前后罗拉钳口对须条的控制力与须条本身抱合力","锭子转速与钢领直径的匹配程度","钢丝圈号数与纱管卷绕密度的对应关系","车间温湿度与细纱机机身振动的综合状态"],"answer":[0],"explanation":"牵伸力来源于罗拉钳口对须条的握持与纤维间的抱合摩擦，属于牵伸区受力本质；锭速与钢领直径影响的是卷绕张力而非牵伸力；钢丝圈号数决定气圈张力与卷绕密度，不决定牵伸力；温湿度与振动只间接影响牵伸稳定性，不是牵伸力主要来源。"},{"id":144,"type":"single","stem":"挡车工在细纱机前罗拉处接头时，正确的接头顺序是","options":["先引纱穿钢丝圈再取纱管纱头对接","先取纱管纱头再引纱穿钢丝圈后对接","先对接纱尾再引纱穿导纱钩和钢丝圈","先穿导纱钩再引纱穿钢丝圈最后取纱头"],"answer":[1],"explanation":"标准接头应先从纱管上取出纱头，再引纱依次穿过导纱钩、钢丝圈，最后与前罗拉输出的须条对接加捻；先穿钢丝圈后取纱头会打乱引纱路径且纱头易断；先对接再穿导纱钩钢丝圈无法形成正确气圈路径；先穿导纱钩再取纱头顺序颠倒，钢丝圈无法正确挂纱。"},{"id":145,"type":"single","stem":"细纱机运行中某锭突然断头，挡车工观察断头处纱尾呈明显卷曲蓬松状且无加捻痕迹，最可能的断头原因是","options":["钢丝圈磨损导致气圈张力突变","前罗拉钳口握持力不足造成须条滑脱","粗纱在牵伸区被意外牵伸过度","锭带打滑使锭速瞬时下降"],"answer":[1],"explanation":"断头处无捻且蓬松，说明断头发生在加捻之前的前罗拉钳口处，是钳口握持力不足导致须条滑脱；钢丝圈磨损造成气圈张力突变断头通常纱尾带捻且有磨痕；牵伸过度会使纱条细节增多但断头位置多在牵伸区中后部；锭带打滑影响卷绕张力，断头纱尾一般仍带捻。"},{"id":146,"type":"single","stem":"细纱机某锭位连续多次断头且断头位置集中在钢丝圈附近，纱尾带明显磨痕，正确的首要处置是","options":["调低该锭前罗拉转速以减小牵伸力","更换该锭钢丝圈并检查钢领磨损情况","加大该锭粗纱喂入量以增加纱条强力","调整该锭导纱钩高度以改变气圈形态"],"answer":[1],"explanation":"断头集中在钢丝圈附近且纱尾有磨痕，说明钢丝圈或钢领磨损导致摩擦异常，应先更换钢丝圈并检查钢领；调低前罗拉转速不解决摩擦源问题；加大粗纱喂入量会改变牵伸分配且不治本；导纱钩高度影响气圈形态但磨痕指向的是钢丝圈与钢领的摩擦问题。"},{"id":147,"type":"single","stem":"细纱工序中，粗纱定量偏大而细纱牵伸倍数不变时，成纱会出现的主要变化是","options":["成纱号数偏大且条干不匀率上升","成纱号数偏小且强力明显提高","成纱捻度偏大且毛羽减少","成纱号数不变但伸长率下降"],"answer":[0],"explanation":"牵伸倍数不变而粗纱定量偏大，单位时间喂入纤维量增多，成纱号数偏大，同时牵伸负担加重使条干不匀率上升；号数不会偏小；捻度由锭速与前罗拉速度决定，不因粗纱定量改变；成纱号数不变的说法与实际不符。"},{"id":148,"type":"single","stem":"细纱机锭子与筒管配合不良时，挡车工在巡回中可能观察到的现象是","options":["纱管表面出现规律性波纹状卷绕","气圈高度明显增大且纱线抖动","钢丝圈运行轨迹偏向钢领内侧","前罗拉输出须条出现周期性粗节"],"answer":[0],"explanation":"锭子与筒管配合不良会造成筒管跳动，卷绕纱层出现规律性波纹状卷绕；气圈高度主要由导纱钩位置和锭速决定；钢丝圈轨迹偏向内侧与钢领钢丝圈配合相关；前罗拉输出粗节属牵伸区问题，与锭子筒管配合无直接关系。"},{"id":149,"type":"single","stem":"细纱挡车工在巡回中发现某锭纱线气圈形态明显偏大且碰隔纱板，正确的调整方向是","options":["降低该锭导纱钩位置使气圈缩小","升高该锭导纱钩位置使气圈缩小","增大该锭钢丝圈号数使气圈缩小","减小该锭锭速使气圈缩小"],"answer":[1],"explanation":"气圈形态偏大碰隔纱板，应升高导纱钩位置以缩短气圈高度从而缩小气圈；降低导纱钩位置会使气圈更小但方向相反，实际会加剧碰板前的其他问题；增大钢丝圈号数会使气圈张力变化但非首选调整手段；减小锭速影响产量且不解决气圈几何问题。"},{"id":150,"type":"single","stem":"细纱机牵伸区中皮辊加压不足时，最可能出现的成纱质量问题是","options":["成纱出现规律性竹节且强力下降","成纱捻度偏大且手感偏硬","成纱毛羽减少且条干改善","成纱号数偏小且伸长率提高"],"answer":[0],"explanation":"皮辊加压不足使钳口握持力下降，须条在牵伸中产生滑溜，形成规律性竹节并降低强力；捻度由锭速与前罗拉速度决定，不受皮辊加压影响；毛羽不会减少；号数偏小与加压不足无直接对应关系。"},{"id":151,"type":"single","stem":"细纱机采用较大牵伸倍数时，为减少成纱细节和断头，牵伸工艺应重点保证的是","options":["加大后区牵伸倍数并减小前区牵伸倍数","合理分配前后区牵伸并加强中区控制","提高锭速以增加纱条张力稳定牵伸","减小粗纱捻度以降低牵伸阻力"],"answer":[1],"explanation":"大牵伸倍数下须合理分配前后区牵伸并加强中区控制，保证纤维变速点稳定；加大后区牵伸会加剧后区须条扩散；提高锭速影响卷绕而非牵伸控制；减小粗纱捻度会降低须条抱合力，反而增加细节和断头。"},{"id":152,"type":"single","stem":"细纱车间相对湿度偏低时，挡车工在操作中会明显感到","options":["纱线毛羽增多且断头率上升","钢丝圈磨损加快且气圈变小","粗纱回潮增大且牵伸力下降","锭带打滑增多且锭速波动"],"answer":[0],"explanation":"相对湿度偏低使纤维抱合力下降、静电增加，纱线毛羽增多、断头率上升；钢丝圈磨损与气圈变化主要受机械与速度影响；粗纱回潮在低湿环境下反而降低；锭带打滑与湿度无直接因果关系。"},{"id":153,"type":"multi","stem":"细纱挡车工处理断头时，下列哪些操作有助于提高接头质量和减少重复断头","options":["接头前先清理导纱钩和钢丝圈处的飞花","接头时纱尾长度适中并捻入前罗拉输出须条","接头后立即用手拉纱线检查接头强力","接头时适当降低该锭瞬时锭速以利加捻"],"answer":[0,1],"explanation":"清理导纱钩和钢丝圈处飞花可避免杂质带入接头影响强力；纱尾长度适中并捻入须条是保证接头牢固的关键；接头后用手拉纱线检查会破坏接头结构且不符合操作规范；降低瞬时锭速会改变捻度且多数机型不支持单锭随意降速，不是标准做法。"},{"id":154,"type":"single","stem":"细纱机开车时，锭子与筒管配合面有油污会影响正常卷绕，正确的处理方式是","options":["用干净回丝蘸清水擦拭锭杆与筒管孔","用细砂纸打磨筒管孔内壁去除油污","用干回丝擦净锭杆后换用洁净筒管","在锭杆涂少量滑石粉再插筒管"],"answer":[2],"explanation":"知识点：锭子与筒管配合面清洁要求。正确项用干回丝擦净锭杆并换洁净筒管，可恢复配合精度和摩擦力，保证卷绕正常。A项清水擦拭会在金属面留下水分，易生锈并改变摩擦；B项砂纸打磨会破坏筒管内孔尺寸，造成配合过松；D项滑石粉会降低配合摩擦，导致筒管打滑。"},{"id":155,"type":"single","stem":"细纱接头时，引纱长度过长会造成接头处粗节，通常应将引纱长度控制在","options":["与罗拉隔距相同的长度","略短于纤维平均长度的长度","超过手掌宽度的长度","等于钢领直径的长度"],"answer":[1],"explanation":"知识点：细纱接头引纱长度控制。引纱略短于纤维平均长度，可使接头处纤维搭接均匀、不产生明显粗节。A项与罗拉隔距相同，引纱过长，接头粗节明显；C项超过手掌宽度，远大于纤维长度，粗节更严重；D项钢领直径与引纱长度无对应关系，属参数混用。"},{"id":156,"type":"single","stem":"细纱机断头后，锭子上残留的纱尾缠绕较紧，正确的处理顺序是","options":["先拔下筒管再剪断纱尾","先剪断纱尾再拔下筒管","先开车再停车后剪纱尾","先换钢丝圈再拔筒管"],"answer":[1],"explanation":"知识点：断头后残留纱尾处理程序。先剪断纱尾再拔筒管，可避免拔管时纱尾拉伤锭杆或带乱邻锭。A项直接拔管会把紧缠纱尾拉断并可能损伤锭杆；C项先开车会使缠尾甩出伤人或缠乱；D项换钢丝圈与处理纱尾无先后逻辑，属程序错乱。"},{"id":157,"type":"single","stem":"细纱机钢领板升降动程偏小时，卷绕成形会出现","options":["纱管两端留白增大","纱管中部凸起","纱管直径整体偏大","纱管底部绕纱过密"],"answer":[0],"explanation":"知识点：钢领板升降动程与管纱成形。动程偏小，卷绕高度不足，两端留白增大。B项中部凸起多与成形凸轮或级升机构有关；C项整体偏大与卷绕张力或级升量有关；D项底部过密与始纺位置或级升配合有关，均非动程偏小的直接结果。"},{"id":158,"type":"single","stem":"细纱挡车工在巡回中发现某锭子纱线张力明显偏小、气圈膨大，首先应检查","options":["钢丝圈是否偏轻或磨损","粗纱定量是否偏大","车间温度是否偏高","锭带是否过紧"],"answer":[0],"explanation":"知识点：气圈与张力异常的判断。张力偏小、气圈膨大，常见原因是钢丝圈偏轻或磨损，应首先检查。B项粗纱定量偏大会使牵伸负荷变化，但不直接导致气圈膨大；C项温度偏高影响断头率，不直接改变单锭张力；D项锭带过紧会使锭速异常，气圈表现相反。"},{"id":159,"type":"single","stem":"细纱接头操作中，接头后纱线上出现明显细节，最可能的原因是","options":["接头时捻接时间过长","接头时纱尾搭接过短","接头后未及时开车","钢丝圈型号偏重"],"answer":[1],"explanation":"知识点：接头细节产生原因。纱尾搭接过短，接头处纤维数量不足，形成细节。A项捻接时间过长易形成粗节而非细节；C项未及时开车主要影响效率和张力，不直接产生细节；D项钢丝圈偏重主要影响张力与断头，与接头细节无直接因果。"},{"id":160,"type":"single","stem":"某班组细纱机断头率突然升高，检查发现断头集中在靠车头侧若干锭，且这些锭子气圈明显歪斜，下一步最合理的处置是","options":["整台车降低锭速运行","检查该区域锭子与钢领对中情况","加大粗纱捻度后继续生产","更换全部钢丝圈后观察"],"answer":[1],"explanation":"知识点：断头集中且气圈歪斜的现场判断。断头集中在局部且气圈歪斜，指向锭子与钢领对中不良，应检查对中。A项整台降速掩盖局部问题，不解决对中；C项加粗纱捻度与气圈歪斜无直接关系；D项全部换钢丝圈范围过大，未针对对中问题。"},{"id":161,"type":"single","stem":"细纱机进行揩车保养时，对牵伸区皮辊的正确做法是","options":["用汽油浸泡后刮除表面棉蜡","用专用清洁剂擦拭并检查表面状态","用毛刷蘸水刷洗后立即安装","拆下后放入粗纱间自然回潮"],"answer":[1],"explanation":"知识点：皮辊保养规范。应用专用清洁剂擦拭并检查表面，避免损伤皮辊。A项汽油浸泡会腐蚀皮辊胶层；C项蘸水刷洗会改变皮辊表面摩擦并易残留水分；D项放入粗纱间回潮与皮辊保养无关，且可能沾染飞花。"},{"id":162,"type":"multi","stem":"细纱机断头后接头前，需要完成的准备工作包括","options":["找出断头锭子上的纱尾并剪断","清洁锭杆和筒管配合面","检查钢丝圈是否缺、坏","将粗纱从喇叭口拉出扔掉","把邻锭纱线一并剪断"],"answer":[0,1,2],"explanation":"知识点：断头接头前的准备。找纱尾剪断、清洁锭杆筒管配合面、检查钢丝圈，均为接头前必要准备。D项粗纱拉出扔掉会造成浪费且非必要，应正常退绕；E项剪断邻锭纱线属误操作，会扩大断头。"},{"id":163,"type":"single","stem":"细纱机开车时，管纱生头后纱线未经过导纱钩直接卷绕，最容易造成下列哪种后果","options":["纱线张力偏小、管纱成形松软","纱线张力偏大、断头增多","导纱钩磨损加快、出现毛刺","锭子转速下降、产量降低"],"answer":[0],"explanation":"知识点是细纱卷绕的纱线通道。纱线不经过导纱钩，气圈失控，张力显著减小，卷绕松软。张力偏大是导纱钩位置过低或气圈过小所致；导纱钩磨损与纱线是否经过无直接关系；锭子转速由传动决定，不因绕纱路径改变。"},{"id":164,"type":"single","stem":"细纱挡车工进行接头操作时，引纱长度一般应控制在下列哪个范围","options":["50～80 mm","100～150 mm","200～250 mm","300～350 mm"],"answer":[1],"explanation":"知识点是细纱接头引纱长度。引纱100～150 mm便于右手拔纱、左手寻头并完成捻接。50～80 mm太短，手指无法有效控制纱头；200 mm以上过长，纱条易缠绕、接头效率低。"},{"id":165,"type":"single","stem":"细纱机锭子出现明显轴向窜动时，挡车工首先应检查下列哪一项","options":["锭脚油杯中油量是否充足","锭带张力是否过大","钢领板升降是否灵活","导纱钩是否对准锭子中心"],"answer":[0],"explanation":"知识点是锭子轴向窜动的常见原因。锭脚油杯缺油或油质恶化会破坏锭子动态支承，引起窜动。锭带张力过大主要表现为锭子振动或锭带发热；钢领板升降不灵活影响卷绕成形；导纱钩不对中影响气圈和断头，均不直接导致轴向窜动。"},{"id":166,"type":"single","stem":"细纱机采用较小直径钢领时，下列哪项调整最合理","options":["适当降低锭速以控制张力","适当提高锭速以维持产量","增大导纱钩与锭子中心距","减小钢丝圈号数"],"answer":[0],"explanation":"知识点是钢领直径与锭速、张力的匹配。小钢领使纱线卷绕直径减小，若维持原锭速，离心力和张力会偏大，断头增加，故应适当降低锭速。提高锭速会加剧断头；导纱钩中心距由气圈和卷绕要求决定，不是补偿钢领直径的主要手段；减小钢丝圈号数会减小张力，但配合小钢领时通常需综合调整，单独减小号数并非最合理首选。"},{"id":167,"type":"single","stem":"细纱挡车工在巡回中发现个别锭子纱线连续出现竹节状粗节，最可能的原因是","options":["该锭子牵伸罗拉加压不足","该锭子钢丝圈号数偏大","该锭子导纱钩位置偏高","该锭子锭带打滑"],"answer":[0],"explanation":"知识点是竹节纱疵的成因。牵伸罗拉加压不足会使纤维握持力不够，产生周期性粗节。钢丝圈号数偏大主要影响张力与断头；导纱钩位置偏高影响气圈形态；锭带打滑造成锭速不匀，主要表现为捻度不匀而非竹节粗节。"},{"id":168,"type":"single","stem":"细纱机断头后，挡车工处理断头时正确的操作顺序是","options":["先关车再拔纱，寻头后接头","先拔纱寻头，再关车接头","先接头再检查断头原因","先通知保全再自行接头"],"answer":[0],"explanation":"知识点是细纱断头处理程序。正确顺序为先关车，防止锭子继续回转造成纱线缠绕，再拔纱、寻头、接头。不关车直接拔纱易伤手并造成乱纱；先接头再查原因会遗漏故障隐患；断头处理属挡车工职责，先通知保全不符合岗位分工。"},{"id":169,"type":"single","stem":"细纱机胶辊表面出现周期性凹坑时，对成纱质量最可能造成的影响是","options":["成纱条干恶化、出现规律性粗细节","成纱强力整体下降、捻度不匀","成纱毛羽减少、光泽改善","成纱重量偏差增大、支数偏粗"],"answer":[0],"explanation":"知识点是胶辊状态与成纱条干的关系。胶辊周期性凹坑使钳口握持力周期变化，产生规律性粗细节，条干恶化。整体强力下降和捻度不匀多与牵伸工艺或锭子传动有关；毛羽减少不是凹坑胶辊的典型表现；重量偏差和支数偏粗主要与定量和牵伸比有关。"},{"id":170,"type":"single","stem":"细纱机进行保全保养后重新开车，挡车工发现整台车断头集中在同一侧，首先应检查","options":["该侧锭带是否松脱或张力不足","该侧粗纱是否用完","该侧导纱钩是否全部更换","该侧锭子是否全部加油"],"answer":[0],"explanation":"知识点是细纱断头集中性判断。整台车同一侧断头集中，多与该侧传动或锭带系统异常有关，锭带松脱或张力不足会导致该侧锭速不匀、断头增多。粗纱用完表现为逐个锭子断头而非整侧集中；导纱钩全部更换和锭子全部加油不是保养后立即集中断头的常见原因。"},{"id":171,"type":"single","stem":"某挡车工在巡回时发现相邻两锭纱线捻度明显偏小，其余锭子正常，最可能的原因是","options":["这两锭锭带打滑或锭速偏低","这两锭粗纱定量偏轻","这两锭钢丝圈号数偏小","这两锭导纱钩位置偏低"],"answer":[0],"explanation":"知识点是捻度不匀的局部原因。个别锭子捻度偏小，多因锭带打滑、锭子回转不足造成。粗纱定量偏轻主要影响成纱支数；钢丝圈号数偏小影响张力而非捻度；导纱钩位置偏低影响气圈和张力，不直接改变锭子回转速度。"},{"id":172,"type":"single","stem":"细纱机开车时，锭子开始回转但纱管尚未卷绕的瞬间，挡车工应重点观察哪个部位以防止纱线退绕混乱？","options":["导纱钩处纱线张力状态","锭盘底部与锭带接触面","粗纱吊锭的退绕位置","吸棉管口的负压大小"],"answer":[0],"explanation":"知识点是开车瞬间的纱线控制。导纱钩处纱线张力状态直接决定纱线是否能顺利卷绕到纱管上，正确项对；锭盘与锭带接触面主要影响锭速传递，与退绕混乱无直接关系；粗纱吊锭退绕位置影响粗纱供应而非细纱卷绕；吸棉管负压影响断头后纤维收集，不是开车瞬间防止退绕混乱的关键部位。"},{"id":173,"type":"single","stem":"细纱接头时，将纱尾与锭翼顶端纱头搭接后，正确的动作顺序是下列哪一项？","options":["先引纱绕导纱钩再捻接","先捻接再引纱绕导纱钩","先绕导纱钩再找纱尾","先找纱尾再绕导纱钩"],"answer":[3],"explanation":"知识点是细纱接头的标准动作程序。正确顺序是先找到纱尾，再引纱绕导纱钩，然后进行搭接捻合，因此先找纱尾再绕导纱钩符合操作逻辑；先引纱绕钩再捻接跳过了找纱尾环节；先捻接再引纱绕钩顺序颠倒；先绕导纱钩再找纱尾也不符合从纱尾开始的接头流程。"},{"id":174,"type":"single","stem":"挡车工在巡视中发现某锭断头后，锭子仍在高速回转且纱管上无纱，正确的第一步处置是？","options":["立即拔下纱管更换新管","先提起纱线再接头","先关停该锭再接头","先清理吸棉管再接头"],"answer":[2],"explanation":"知识点是断头后的安全处置。断头后锭子仍高速回转，直接伸手接头有绞伤风险，应先关停该锭再接头，正确项对；拔下纱管更换新管不是断头处理的第一步；先提纱线再接头未先停锭，存在安全隐患；清理吸棉管不是断头后接头的首要步骤。"},{"id":175,"type":"single","stem":"细纱机牵伸区中，后区牵伸倍数设置偏大时，最容易出现的纱线质量问题是？","options":["粗节增多","细节增多","棉结减少","条干改善"],"answer":[0],"explanation":"知识点是牵伸工艺参数对纱线质量的影响。后区牵伸倍数偏大时，须条在后区受到的牵伸力增大，纤维易产生集束和滑移不均，导致粗节增多，正确项对；细节增多通常与前区牵伸或罗拉握持有关；棉结减少不是后区牵伸偏大的典型结果；条干改善与后区牵伸偏大的实际效果相反。"},{"id":176,"type":"single","stem":"细纱锭带张力过松时，对纺纱过程造成的直接影响是？","options":["锭速偏低且波动","锭速偏高且稳定","纱管卷绕过紧","导纱钩磨损加快"],"answer":[0],"explanation":"知识点是锭带张力与锭速的关系。锭带张力过松会使锭带打滑，锭速偏低且波动，正确项对；锭速偏高且稳定与打滑现象矛盾；纱管卷绕过紧与锭速偏低无直接因果；导纱钩磨损加快与锭带张力无直接关系。"},{"id":177,"type":"single","stem":"细纱接头后，纱线上出现一个明显粗于正常纱的疙瘩，最可能的原因是？","options":["接头时纱尾留得过长","接头时纱尾留得过短","接头时导纱钩未绕纱","接头时锭速开得过低"],"answer":[0],"explanation":"知识点是接头质量与纱尾长度的关系。接头时纱尾留得过长，捻合后多余纤维形成疙瘩，正确项对；纱尾留得过短会导致接头不牢而非粗疙瘩；导纱钩未绕纱会导致纱线跑偏而非局部粗节；锭速开得过低影响接头强力而非形成疙瘩。"},{"id":178,"type":"single","stem":"某挡车工在细纱机运行时听到锭子处有周期性异响，且该锭纱线张力明显偏小，最可能的故障部位是？","options":["锭子轴承磨损","导纱钩松动","吸棉管堵塞","粗纱吊锭缺油"],"answer":[0],"explanation":"知识点是锭子故障的听音判断。锭子轴承磨损会产生周期性异响并影响锭速稳定性，导致纱线张力偏小，正确项对；导纱钩松动表现为纱线跑偏而非周期性异响；吸棉管堵塞影响断头吸棉而非张力；粗纱吊锭缺油影响粗纱退绕而非细纱锭子异响。"},{"id":179,"type":"single","stem":"细纱机采用集合器时，集合器开口过小对纱线质量的主要影响是？","options":["条干恶化且易出硬头","条干改善且棉结减少","毛羽增加且强力下降","粗节减少且细节增多"],"answer":[0],"explanation":"知识点是集合器开口对牵伸的影响。集合器开口过小会挤压须条，使纤维排列紊乱，条干恶化并易出硬头，正确项对；条干改善且棉结减少与开口过小的实际效果相反；毛羽增加且强力下降不是开口过小的主要表现；粗节减少且细节增多不符合开口过小的典型结果。"},{"id":180,"type":"single","stem":"挡车工在交接班时发现上一班留下的纱管混有不同批号的粗纱，正确的处置方式是？","options":["直接继续使用不区分","挑出混批粗纱单独处理","将混批粗纱全部废弃","把混批粗纱重新接头使用"],"answer":[1],"explanation":"知识点是交接班时的原料批次管理。混批粗纱会导致成纱质量不一致，应挑出混批粗纱单独处理，正确项对；直接继续使用会造出混批纱；全部废弃不符合节约原则且过度；重新接头使用无法消除批次差异。"},{"id":181,"type":"single","stem":"细纱机在纺制某品种时断头率突然升高，检查发现前罗拉握持力正常、粗纱供应正常，最应优先检查的是？","options":["锭子与锭带的传动状态","粗纱定量是否偏大","车间温湿度是否偏低","成品纱的捻度是否偏高"],"answer":[0],"explanation":"知识点是断头率升高的排查顺序。在前罗拉和粗纱供应正常的情况下，应优先检查锭子与锭带传动状态，因为锭速不稳或打滑会直接增加断头，正确项对；粗纱定量偏大是供应端问题，已排除；温湿度偏低影响面广但不是优先单点排查；捻度偏高是工艺设计问题，不会突然升高断头率。"},{"id":182,"type":"single","stem":"细纱机揩车时，对牵伸罗拉表面进行清洁，正确的做法是？","options":["用专用工具沿罗拉轴向轻擦","用湿布横向用力擦拭","用压缩空气直接吹表面","用金属刮刀刮除缠花"],"answer":[0],"explanation":"知识点是揩车时罗拉清洁规范。应用专用工具沿罗拉轴向轻擦，避免损伤罗拉表面，正确项对；湿布横向用力擦拭易造成罗拉锈蚀和表面损伤；压缩空气直接吹会使飞花进入轴承；金属刮刀会刮伤罗拉表面。"},{"id":183,"type":"multi","stem":"细纱挡车工在交接班时需要重点核对的内容包括下列哪些项？","options":["各锭断头情况及处理记录","粗纱批次与剩余量","机台运转速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要受卷绕螺距等成形参数影响。"},{"id":223,"type":"single","stem":"细纱车间相对湿度偏低时，最易出现的现象是","options":["须条蓬松，静电增多，断头增加","须条发黏，牵伸不开","钢丝圈磨损加快，飞圈增多","管纱回潮偏大，易霉变"],"answer":[0],"explanation":"知识点：细纱车间温湿度影响纤维导电性和牵伸状态。湿度偏低时纤维回潮低、静电不易导出，须条蓬松、飞花多、断头增加。湿度偏高时须条发黏、牵伸不良、易缠罗拉；回潮偏大易霉变也属于高湿问题；钢丝圈磨损与飞圈主要和钢丝圈选配及锭速有关。"},{"id":224,"type":"single","stem":"细纱机牵伸区中，前罗拉与后罗拉之间的牵伸倍数称为","options":["总牵伸倍数","后区牵伸倍数","主牵伸倍数","机械牵伸倍数"],"answer":[2],"explanation":"知识点：细纱机牵伸分为主牵伸和后区牵伸。前罗拉至中罗拉（或前牵伸区）承担主要牵伸，称主牵伸；中罗拉至后罗拉为后区牵伸。总牵伸是前罗拉与后罗拉线速之比；机械牵伸是按齿轮传动比计算的牵伸，与工艺牵伸不同。"},{"id":225,"type":"single","stem":"细纱接头操作中，引纱时纱线应放置的位置是","options":["从罗拉前方引出，压入导纱钩后接头","从罗拉后方引出，穿过牵伸区再接头","从锭翼侧引出，绕过钢丝圈再接头","从管纱直接引出，不经导纱钩接头"],"answer":[0],"explanation":"知识点：细纱接头引纱路径应使纱线经过导纱钩、钢丝圈后与须条对接，才能保证加捻和卷绕正常。从罗拉前方引出、压入导纱钩后接头符合操作规范。从后方引出会穿越牵伸区，破坏牵伸；绕过锭翼侧不符合细纱机结构；不经导纱钩接头则气圈失控、捻度传递异常。"},{"id":226,"type":"single","stem":"细纱机后区牵伸倍数过大时，最可能出现的问题是","options":["前区牵伸负担减轻，条干改善","后区须条拉断，粗节增多","捻度传递加快，纱线发硬","钢丝圈张力减小，气圈变大"],"answer":[1],"explanation":"知识点：后区牵伸过大时，后区须条被过度拉伸，纤维间抱合力不足，容易在后区拉断或形成粗节，同时使进入前区的须条结构变差。后区牵伸过大并不会减轻前区负担，反而使条干恶化；捻度传递和钢丝圈张力与后区牵伸无直接关系。"},{"id":227,"type":"single","stem":"某挡车工发现所看锭子断头集中在管底小纱阶段，且断口多在钢丝圈附近，正确的处置是","options":["适当减轻钢丝圈重量，减小小纱张力","加大后区牵伸，改善须条结构","提高锭速，缩短小纱阶段时间","增加卷绕螺距，减少卷绕密度"],"answer":[0],"explanation":"知识点：管底小纱阶段气圈最大、张力最高，断头集中在钢丝圈附近多与张力过大有关。适当减轻钢丝圈重量可减小张力，缓解小纱断头。加大后区牵伸会恶化条干；提高锭速会进一步增大张力；增加卷绕螺距主要影响成形密度，不解决小纱张力问题。"},{"id":228,"type":"single","stem":"交接班时发现上一班留下的管纱成形出现明显凸肚、冒头，作为接班挡车工首先应","options":["立即全部落下返工，重新纺纱","检查成形机构及卷绕参数是否异常","调整钢丝圈重量，改变气圈形态","提高锭速，把成形拉紧"],"answer":[1],"explanation":"知识点：管纱凸肚、冒头属于成形不良，多与成形机构、卷绕螺距、级升等参数异常有关。接班发现成形异常应先检查成形机构及卷绕参数，查明原因再处理。全部落下返工不必要且浪费；钢丝圈重量影响张力与气圈，不直接决定成形凸肚；提高锭速不能纠正成形机构问题。"},{"id":229,"type":"single","stem":"细纱机开车后纱线出现周期性粗节，且粗节间距与牵伸罗拉周长一致，应优先检查哪个部位","options":["牵伸罗拉表面的沟槽或缠花","锭子回转的振动幅度","纲领板的升降动程","导纱钩的磨损程度"],"answer":[0],"explanation":"知识点是细纱机牵伸部件缺陷导致的周期性纱疵。牵伸罗拉周长与粗节间距一致，说明缺陷在牵伸罗拉本身，沟槽或缠花会造成规律性粗节；锭子振动影响的是条干均匀度而非固定周期粗节；纲领板升降影响的是卷绕成形；导纱钩磨损影响毛羽和断头，不产生周期性粗节。"},{"id":230,"type":"single","stem":"接头操作中，将纱尾从须条中拉出时，正确的做法是","options":["左手食指轻压须条，右手缓慢匀力抽纱尾","左手拇指紧捏须条，右手快速猛地拉出","左手松握须条，右手边旋转边拉出","左手食指压住须条，右手先拉断再回送"],"answer":[0],"explanation":"知识点是细纱接头中抽纱尾的手法。轻压须条配合缓慢匀力抽拉，能保持须条纤维排列整齐、纱尾光洁；紧捏后猛拉会造成须条纤维紊乱、接头粗节；边旋转边拉会使纤维缠绕成结；先拉断再回送会破坏须条结构，接头不牢。"},{"id":231,"type":"single","stem":"细纱机纺纱过程中，前罗拉与锭子之间的纱线张力过大时，最可能出现的现象是","options":["断头率升高且断口呈须状","纱线毛羽减少且条干改善","气圈高度明显降低","钢丝圈运行速度下降"],"answer":[0],"explanation":"知识点是细纱张力与断头的关系。张力过大时纱线超过强力极限，断头增多且断口纤维松散呈须状；张力过大不会减少毛羽或改善条干；气圈高度由气圈环位置和锭速决定，不是张力过大的直接表现；钢丝圈速度主要受锭速影响，与张力过大无直接对应关系。"},{"id":232,"type":"single","stem":"细纱接头时，纱尾与须条搭接后捻入的方向应","options":["顺原纱捻向捻入","逆原纱捻向捻入","与须条方向垂直捻入","先逆捻再顺捻"],"answer":[0],"explanation":"知识点是细纱接头捻向的掌握。顺原纱捻向捻入，纤维能沿着原有捻回方向抱合，接头处强力高、外观好；逆捻向会使捻回紊乱、接头粗大且强力下降；垂直捻入无法形成有效抱合；先逆后顺会破坏接头处纤维排列。"},{"id":233,"type":"single","stem":"某细纱工在交接班时发现上一班留下的皮辊表面有油污，正确的处置是","options":["用专用清洁剂擦拭干净后再开车","直接开车等运转中自然磨掉","用棉纱干擦后立即开车","用清水冲洗后马上上车使用"],"answer":[0],"explanation":"知识点是皮辊清洁与交接班处理。皮辊表面油污会影响牵伸握持力，造成纱疵，必须用专用清洁剂擦拭干净后使用；直接开车会使油污污染须条产生油纱；干擦难以去净油污；清水冲洗会使皮辊受潮、影响表面性能且不宜马上使用。"},{"id":234,"type":"single","stem":"细纱断头后，挡车工拔下纱管处理断头，正确的操作顺序是","options":["先找断头位置，再引纱接头，最后开车","先开车再找断头，边开边接","先拔纱管再开车，最后接头","先接头再找断头位置，最后开车"],"answer":[0],"explanation":"知识点是细纱断头处理的规范程序。正确顺序是先找出断头位置并清理，再引纱完成接头，确认无误后开车，可避免重复断头和纱疵；先开车再找会造成纱线浪费和安全隐患；先拔纱管再开车顺序颠倒；先接头再找断头位置不符合操作逻辑。"},{"id":235,"type":"single","stem":"细纱机牵伸区中，粗纱在喂入时出现意外牵伸，最可能造成的纱疵是","options":["长片段粗节和细节","周期性竹节","密集性毛羽","固定位置粗节"],"answer":[0],"explanation":"知识点是意外牵伸与纱疵类型。粗纱喂入时意外牵伸会使纱线片段变细或变粗，形成长片段粗节和细节；周期性竹节多由牵伸部件缺陷引起；密集性毛羽与导纱部件磨损有关；固定位置粗节与罗拉沟槽等固定缺陷对应。"},{"id":236,"type":"single","stem":"细纱工在操作中需要更换钢丝圈，正确的做法是","options":["停车后按品种要求更换同号钢丝圈","开车状态下快速更换钢丝圈","停车后更换比原号轻一号的钢丝圈","开车状态下更换比原号重一号的钢丝圈"],"answer":[0],"explanation":"知识点是钢丝圈更换的规范。更换钢丝圈必须停车进行，并按品种工艺要求选用同号钢丝圈，保证气圈和张力稳定；开车状态下更换极易伤手且不安全；随意改变钢丝圈号数会破坏气圈形态和张力，造成断头或纱疵。"},{"id":237,"type":"single","stem":"某班组在细纱机改纺新品种后，发现断头率明显高于原品种，经查锭速、牵伸、捻度均按工艺单执行，下一步应重点核查","options":["钢丝圈号数是否与新品种匹配","粗纱是否已经用完","车间温湿度是否达到规定","挡车工巡回路线是否合理"],"answer":[0],"explanation":"知识点是改纺新品种后断头率升高的排查。锭速、牵伸、捻度已按工艺执行，钢丝圈号数若未随品种调整，会因张力不匹配导致断头升高；粗纱用完属于供应问题不是断头主因；温湿度是常规条件，不是改纺后突变的重点；巡回路线影响效率但不直接造成断头率突升。"},{"id":238,"type":"multi","stem":"细纱接头质量的好坏可以从哪些方面进行评定","options":["接头处强力是否接近原纱","接头处外观是否光洁无粗节","接头处捻度是否与原纱一致","接头操作是否在开车状态下完成","接头后纱线颜色是否改变"],"answer":[0,1,2],"explanation":"知识点是细纱接头质量的评定指标。接头强力接近原纱、外观光洁无粗节、捻度与原纱一致，是衡量接头质量的三个核心方面；接头必须在停车状态下完成，开车接头不是质量评定内容；接头不会改变纱线颜色，颜色不是评定指标。"},{"id":239,"type":"single","stem":"细纱接头时，左手食指与拇指捏住纱尾的位置应距离须条断头端约多少毫米，才能保证接头后疵点最少？","options":["1～2","8～12","20～25","35～40"],"answer":[1],"explanation":"知识点：细纱接头捏纱尾的适宜位置。捏纱尾距断头端8～12mm，便于引纱搭接且不产生长粗节，故正确。1～2mm过近，纤维搭接不足易脱节；20～25mm和35～40mm过远，会形成长粗节或带入飞花形成疵点。"},{"id":240,"type":"single","stem":"细纱机断头后纱尾被吸棉笛管吸走，挡车工补接前应先做下列哪一步？","options":["直接用手在吸棉口处抠出纱尾引接","关闭吸棉风机再引纱补接","用竹扦从吸棉口把纱尾挑出引接","加大吸棉风量把纱尾吹出引接"],"answer":[1],"explanation":"知识点：断头后吸棉笛管处纱尾的处理程序。应先关闭吸棉风机或使该锭吸棉口暂不吸纱，再引纱补接，避免纱尾被持续吸走，故正确。直接用手抠、用竹扦挑、加大风量吹，都不能解决持续吸走的问题，还可能伤手或造成飞花。"},{"id":241,"type":"single","stem":"细纱挡车工巡回时发现个别锭子纱线出现规律性粗节，检查牵伸部分最应先怀疑下列哪个部位？","options":["胶辊表面有凹坑或缠绕","锭带张力过大","钢领磨损起槽","导纱钩位置偏高"],"answer":[0],"explanation":"知识点：规律性粗节的成因判断。胶辊凹坑或缠绕会造成周期性牵伸不匀，形成规律性粗节，故正确。锭带张力过大影响锭速和捻度，不直接造成规律粗节；钢领起槽多造成毛羽和断头；导纱钩偏高影响气圈和张力，也不形成规律粗节。"},{"id":242,"type":"single","stem":"细纱机牵伸区下胶圈张力过小，最可能引起下列哪种现象？","options":["成纱条干恶化、出现硬头","成纱捻度明显偏低","筒管成形出现冒纱","钢领板升降顿挫"],"answer":[0],"explanation":"知识点：下胶圈张力对牵伸质量的影响。下胶圈张力过小，胶圈运行不稳、须条控制不良，条干恶化并出现硬头，故正确。捻度偏低主要与锭速、钢丝圈和卷绕张力有关；冒纱与成形机构或操作有关；钢领板顿挫属升降机构问题，均非胶圈张力过小直接引起。"},{"id":243,"type":"single","stem":"细纱机采用较大直径钢丝圈时，在其他条件不变的情况下，纱线张力会如何变化？","options":["张力减小","张力增大","张力先减后增","张力不变"],"answer":[1],"explanation":"知识点：钢丝圈号数与纱线张力的关系。钢丝圈越重，离心力越大，纱线张力越大，故正确。张力随钢丝圈重量增大而增大，不存在先减后增；认为不变则忽略了钢丝圈重量对张力的直接影响。"},{"id":244,"type":"single","stem":"细纱机落纱后重新开车，发现个别锭子纱线出现连续细节，最可能的原因是下列哪项？","options":["开车时锭速上升过快","落纱时纱尾未处理好","粗纱定量偏轻","钢丝圈号数偏小"],"answer":[1],"explanation":"知识点：落纱后开车细节的成因。落纱时纱尾未处理好，开车瞬间引纱张力突变，易产生连续细节，故正确。锭速上升过快主要影响断头；粗纱定量偏轻属配棉或定量问题，影响全台；钢丝圈偏小使张力偏小，不是个别锭连续细节的主因。"},{"id":245,"type":"single","stem":"细纱机在纺制纯棉精梳纱时，若车间相对湿度过低，最易出现下列哪种情况？","options":["断头增多、飞花增加","纱线回潮率显著升高","钢丝圈磨损加快","粗纱退绕张力减小"],"answer":[0],"explanation":"知识点：车间温湿度对细纱生产的影响。相对湿度过低，纤维抱合力差，断头增多、飞花增加，故正确。湿度过低不会使回潮率升高；钢丝圈磨损与湿度关系不直接；粗纱退绕张力也不会因湿度低而减小。"},{"id":246,"type":"single","stem":"细纱机值车工交接班时，发现上一班留下的粗纱表面有油污，正确的处置方式是下列哪项？","options":["继续使用，油污纱可作回丝处理","挑出油污粗纱交班长处理并记录","把油污粗纱混入正常粗纱继续纺","将油污粗纱直接扔进回花箱"],"answer":[1],"explanation":"知识点：交接班中不合格粗纱的处理程序。油污粗纱须挑出、交班长处理并记录，防止流入成纱，故正确。继续使用或混入正常粗纱会污染成纱；直接扔回花箱未记录，不利追溯和管理。"},{"id":247,"type":"single","stem":"细纱机在正常纺纱中，个别锭子气圈突然变大且伴有碰隔纱板声，最可能的原因是下列哪项？","options":["钢丝圈飞脱","锭带断裂","导纱钩磨损","胶辊加压不足"],"answer":[0],"explanation":"知识点：气圈异常的现场判断。钢丝圈飞脱后失去控制，气圈突然变大并碰隔纱板，故正确。锭带断裂使锭子停转，不会出现大气圈；导纱钩磨损多造成毛羽；胶辊加压不足影响条干，不引起气圈突变。"},{"id":248,"type":"single","stem":"细纱机挡车工在巡迴中发现某锭断头频繁，检查发现该锭钢丝圈烧毁，下一步最合理的处置是下列哪项？","options":["更换同号新钢丝圈并检查钢领状态","加大吸棉风量继续观察","降低该锭锭速后继续纺纱","把该锭粗纱换到相邻锭继续纺"],"answer":[0],"explanation":"知识点：钢丝圈烧毁的现场处置。钢丝圈烧毁多因钢领磨损或润滑不良，应更换同号新钢丝圈并检查钢领，故正确。加大吸棉风量、降低锭速、换锭纺纱都未消除烧毁根源，断头会继续发生。"},{"id":249,"type":"single","stem":"细纱机开车生头时，纱管底部与锭盘之间应保证什么状态才能正常卷绕？","options":["纱管底部与锭盘锥面紧密贴合","纱管底部与锭盘间留出0.5毫米间隙","纱管底部轻放于锭盘上不压实","纱管底部涂蜡后放入锭盘"],"answer":[0],"explanation":"知识点是细纱机锭子与纱管的配合。纱管底部与锭盘锥面必须紧密贴合，才能保证锭子高速回转时纱管不跳动、不丢转，卷绕成形正常。留间隙会跳管，轻放不压实会打滑丢转，涂蜡会改变配合且污染纱线，均属似是而非的错误做法。"},{"id":250,"type":"single","stem":"细纱挡车工在巡回中发现一个锭子上的纱线断头且管纱已绕成葫芦形，正确的处置顺序是？","options":["先拔下纱管换掉坏纱，再接头","先接头恢复纺纱，再处理管纱形状","先停车落纱，再重新生头","先加大该锭速度，再接头"],"answer":[0],"explanation":"知识点是断头后管纱异常的处置程序。葫芦形管纱说明卷绕已乱且纱管可能已松动或锭子异常，必须先拔管换掉坏纱并检查锭子，再重新生头接头，否则接头后仍会乱绕或跳管。先接头、先落纱、先调速都不能消除已乱的管纱和潜在锭子问题。"},{"id":251,"type":"single","stem":"细纱机牵伸区中，前后罗拉之间的牵伸倍数称为？","options":["总牵伸倍数","后区牵伸倍数","主牵伸倍数","机械牵伸常数"],"answer":[2],"explanation":"知识点是细纱牵伸分区概念。前后罗拉间为主牵伸区，其牵伸倍数称主牵伸倍数；总牵伸是全部罗拉间的乘积，后区牵伸指后罗拉与中罗拉之间，机械牵伸常数是传动比计算值，三者均与前后罗拉间倍数不是同一含义。"},{"id":252,"type":"single","stem":"细纱接头时，纱尾与管纱上纱头的搭接长度一般应控制在多少毫米左右？","options":["2至3毫米","6至8毫米","12至15毫米","20至25毫米"],"answer":[1],"explanation":"知识点是细纱接头操作要领。搭接过短（2至3毫米）抱合力不足易脱结，过长（12毫米以上）会形成粗节且浪费，6至8毫米是常规细纱接头搭接长度，能兼顾强度与纱线均匀度，属操作规范记忆点。"},{"id":253,"type":"single","stem":"细纱机锭带张力过松，最可能直接引起下列哪种现象？","options":["锭速偏低且锭子转动不匀","纱线捻度明显偏大","钢领板升降失灵","牵伸罗拉握持力增大"],"answer":[0],"explanation":"知识点是锭带传动与锭速关系。锭带过松会打滑，导致锭速偏低且各锭转速不匀，进而影响捻度和产量。捻度偏大是锭速偏高或前罗拉偏慢所致；钢领板升降由成形机构控制与锭带无关；罗拉握持力由加压决定，与锭带张力无直接关系。"},{"id":254,"type":"single","stem":"细纱机在纺纱过程中出现整台车纱线捻度普遍偏小，优先应检查下列哪一项？","options":["前罗拉转速是否偏高","锭子转速是否偏低","粗纱定量是否偏轻","车间相对湿度是否偏低"],"answer":[1],"explanation":"知识点是捻度与锭速、前罗拉速度的关系。捻度由锭速与前罗拉线速之比决定，整台车捻度普遍偏小首先查锭速是否偏低（如锭带打滑、电机皮带松）。前罗拉偏快是使捻度偏小的另一因素，但题干已限定整台普遍，优先查锭速更直接；粗纱定量和湿度主要影响重量不匀和断头，不直接决定捻度。"},{"id":255,"type":"single","stem":"细纱机开车时，钢领板每次升降的动程称为？","options":["卷绕螺距","升降动程","级升量","成形角"],"answer":[1],"explanation":"知识点是细纱成形机构术语。钢领板一次升降的距离叫升降动程；卷绕螺距是相邻两层纱的轴向间距；级升量是每落纱钢领板起始位置的递增量；成形角是管纱侧面锥角，四者概念相邻易混，需按定义区分。"},{"id":256,"type":"single","stem":"细纱接头操作中，下列哪种做法最有利于提高接头强力？","options":["接头前将纱尾捻度退掉再搭接","接头时用力拉紧两纱尾再捻合","纱尾搭接后立即快速加捻","接头前把纱尾在导纱钩上绕一圈"],"answer":[0],"explanation":"知识点是细纱接头强力形成机理。退掉纱尾部分捻度使纤维松散，搭接后加捻时纤维能相互抱合，接头强力高。用力拉紧会使纤维滑脱、捻合不匀；快速加捻易造成接头粗节和捻度不匀；绕导纱钩增加张力且改变气圈，均不利于接头质量。"},{"id":257,"type":"single","stem":"细纱机在正常纺纱时，气圈形态突然变大且纱线断头增多，下列哪项是最应先排查的环节？","options":["导纱钩是否磨损或位置变动","粗纱定量是否变化","钢领板级升量是否偏大","车间温湿度是否偏高"],"answer":[0],"explanation":"知识点是气圈形态与导纱钩、锭速、张力关系。气圈突然变大常见于导纱钩位置变动或磨损、锭速下降等，应优先查导纱钩。粗纱定量变化影响牵伸不直接改变气圈；级升量偏大影响成形非气圈；温湿度偏高主要影响断头和回潮，不是气圈突变的首查项。"},{"id":258,"type":"single","stem":"细纱机落纱后重新生头，发现纱管在锭子上能上下窜动，正确的处置是？","options":["换用与锭盘锥面配合良好的纱管","在纱管底部垫一层纸片再装","将纱管用力敲入锭盘","降低该锭锭速后继续生头"],"answer":[0],"explanation":"知识点是纱管与锭盘配合对卷绕的影响。纱管窜动说明管底锥孔与锭盘锥面配合不良，必须更换合格纱管。垫纸片、敲入都会破坏配合并损伤锭盘，降速只能暂时掩盖窜动，不能解决管锭配合问题，长期仍会跳管、乱纱。"},{"id":259,"type":"single","stem":"细纱机开车时，锭子启动前应先确认下列哪一项，才能避免纱线因张力突变而断头？","options":["钢领板已回到始纺位置且叶子板已抬起","锭速已调至正常巡航速度","粗纱已提前穿入导纱喇叭口","吸棉笛管已切换到备用风道"],"answer":[0],"explanation":"知识点：细纱机开机前的机械位置确认。正确项：钢领板回始纺位置、叶子板抬起是开车前必须确认的，否则纱线瞬时张力过大断头。错误项：锭速是启动后逐渐升速的，不是启动前调好；粗纱穿入喇叭口是生头操作，不是开机前确认项；吸棉笛管切换风道与开机断头无直接关系。"},{"id":260,"type":"single","stem":"细纱挡车工处理断头时，拔管后应先将纱管上的残留纱尾如何处理，再重新接头？","options":["保留原纱尾直接绕上钢丝圈接头","摘除纱尾后从罗拉钳口重新引纱","将纱尾搭在锭翼上直接开车","把纱尾塞入纱管顶部再接头"],"answer":[1],"explanation":"知识点：断头处理中纱尾的处理规范。正确项：摘除纱尾后从罗拉钳口重新引纱，才能保证接头处纤维排列正常。错误项：保留原纱尾直接绕钢丝圈会造成粗节；搭在锭翼上开车会产生乱纱；塞入纱管顶部属于掩盖问题，接头质量差。"},{"id":261,"type":"single","stem":"细纱接头操作中，拇指标记法与绕钢丝圈法的主要区别在于下列哪一点？","options":["拇指标记法用手指定位纱头位置，绕钢丝圈法靠钢丝圈带引纱头","拇指标记法用于粗支纱，绕钢丝圈法用于细支纱","拇指标记法不需要引纱，绕钢丝圈法需要引纱","拇指标记法在锭子停止时操作，绕钢丝圈法在锭子运转时操作"],"answer":[0],"explanation":"知识点：两种接头手法的本质区别。正确项：拇指标记法是用手指在纱管上做标记定位纱头，绕钢丝圈法是靠钢丝圈回转带引纱头。错误项：两种方法并非按支数区分；两者都需要引纱；接头通常在锭子低速或停止时进行，不是区分点。"},{"id":262,"type":"single","stem":"细纱机运转中某锭持续断头，检查发现钢丝圈磨损严重且飞圈，此时正确的处置是？","options":["仅增加该锭的捻度补偿断头","更换同型号新钢丝圈并检查钢领状态","将该锭粗纱改接到相邻锭子生产","降低整台机器的锭速来迁就该锭"],"answer":[1],"explanation":"知识点：钢丝圈磨损导致断头的处理。正确项：更换同型号新钢丝圈并检查钢领，因为飞圈多因钢丝圈磨损或钢领磨损引起。错误项：增加捻度不能解决飞圈；改接相邻锭子只是转移问题；降低整台锭速影响产量且不解决根本问题。"},{"id":263,"type":"single","stem":"细纱工序中，造成成纱细节（弱捻或细节）较多的常见原因是下列哪一项？","options":["粗纱捻度过大且定量偏重","细纱牵伸倍数过小且后区隔距过大","细纱后区牵伸倍数过大或粗纱捻度偏小","钢领直径偏大且锭速偏低"],"answer":[2],"explanation":"知识点：成纱细节产生的牵伸原因。正确项：后区牵伸倍数过大或粗纱捻度偏小，纤维得不到足够控制，易产生细节。错误项：粗纱捻度过大定量偏重容易出硬头或粗节；牵伸倍数过小、后区隔距过大与细节关系不直接；钢领直径和锭速影响张力与断头，不是细节主因。"},{"id":264,"type":"single","stem":"细纱机牵伸罗拉隔距的调整，主要依据下列哪一项来确定？","options":["粗纱的定量和纤维长度","锭子的转速和钢领直径","细纱的捻系数和纱管尺寸","车间的温湿度和吸棉风量"],"answer":[0],"explanation":"知识点：罗拉隔距的确定依据。正确项：隔距主要根据纤维长度和粗纱定量来确定，保证纤维在牵伸区得到有效控制。错误项：锭速、钢领直径、捻系数、温湿度、风量都不是确定罗拉隔距的直接依据。"},{"id":265,"type":"single","stem":"细纱挡车工在巡回中发现某锭纱管成形出现葫芦状，最可能的原因是？","options":["钢领板升降动程或成形凸轮调整不当","粗纱捻度过大导致牵伸不匀","锭带张力过大造成锭速波动","吸棉笛管负压过高吸走纤维"],"answer":[0],"explanation":"知识点：纱管成形不良的原因分析。正确项：葫芦状成形多因钢领板升降动程或成形凸轮机构调整不当。错误项：粗纱捻度影响牵伸不匀，不形成葫芦状；锭带张力影响锭速和捻度，不直接造成葫芦状；吸棉负压过高会造成断头或毛羽，不形成葫芦状。"},{"id":266,"type":"single","stem":"细纱车间相对湿度偏低时，下列哪一项变化最需要挡车工关注？","options":["断头率上升且飞花增多","粗纱回潮率明显升高","钢丝圈磨损速度减慢","锭子转速自动升高"],"answer":[0],"explanation":"知识点：温湿度对细纱生产的影响。正确项：湿度偏低时纤维抱合力下降，断头率上升、飞花增多。错误项：湿度低粗纱回潮率不会升高；钢丝圈磨损与湿度关系不是减慢；锭子转速由传动决定，不会自动升高。"},{"id":267,"type":"single","stem":"细纱挡车工做清洁工作时，下列哪种做法符合防纱疵要求？","options":["用毛刷从罗拉上方向下清扫绒辊","用揩布擦罗拉时从下往上兜擦","清洁锭盘时用压缩空气直接吹","用毛刷在牵伸区上方来回横刷"],"answer":[0],"explanation":"知识点：细纱清洁操作与防纱疵。正确项：用毛刷从罗拉上方向下清扫绒辊，飞花落入下绒辊可被带走，不易进入牵伸区。错误项：从下往上兜擦易把飞花带入牵伸区；压缩空气吹锭盘会使飞花飞扬落入纱条；牵伸区上方横刷会扰动飞花进入纱条。"},{"id":268,"type":"single","stem":"某挡车工接头后发现接头处明显偏粗，检查发现纱头未从罗拉钳口引出而直接从喇叭口引出，正确做法应是？","options":["重新从罗拉钳口引出纱头再接头","加大接头处捻度掩盖粗节","把粗节段直接掐掉后从纱管中部接头","换用更细的钢丝圈重新接头"],"answer":[0],"explanation":"知识点：接头操作规范与接头粗节的原因。正确项：纱头必须从罗拉钳口引出，保证纤维受控，否则接头偏粗，应重新操作。错误项：加大捻度不能消除粗节；掐掉后从纱管中部接头不符合接头规范；换钢丝圈不能解决引纱位置错误。"},{"id":269,"type":"single","stem":"细纱机某锭断头频繁，检查发现该锭粗纱在导纱喇叭口处有积花堵塞，正确的下一步处置是？","options":["清理喇叭口积花并检查粗纱通道是否顺畅","直接提高该锭的牵伸倍数","更换该锭的粗纱管继续生产","关闭该锭的吸棉风门减少干扰"],"answer":[0],"explanation":"知识点：粗纱通道堵塞导致断头的处理。正确项：先清理喇叭口积花并检查通道，因为积花堵塞会改变粗纱喂入张力导致断头。错误项：提高牵伸倍数不解决堵塞；换粗纱管未排除通道问题；关闭吸棉风门会恶化断头。"},{"id":270,"type":"multi","stem":"细纱挡车工在交接班时，下列哪些内容属于必须交接确认的运转状态？","options":["各锭断头情况及未处理的异常锭","粗纱剩余量和粗纱管使用情况","钢领、钢丝圈更换记录","车间照明灯具的品牌型号","挡车工个人更衣柜编号"],"answer":[0,1,2],"explanation":"知识点：细纱交接班内容。正确项：断头及异常锭、粗纱余量与纱管、钢领钢丝圈更换记录都属于运转状态交接内容。错误项：照明灯具品牌型号、更衣柜编号属于后勤事务，不是运转状态交接内容。"},{"id":271,"type":"single","stem":"细纱机开车时，锭带张力过松，最可能直接造成下列哪种后果？","options":["锭子转速偏低，纱线捻度不匀","锭子转速偏高，纱线捻度偏大","筒管卷绕过紧，成形不良","牵伸区浮游纤维增多，条干恶化"],"answer":[0],"explanation":"知识点是锭带张力对锭速和捻度的影响。锭带过松会打滑，锭速下降，捻度随之不足且不匀，故A正确；B把结果说反，张力松不会使锭速偏高；C卷绕过紧主要与卷绕张力、成形机构有关，与锭带张力松无直接因果；D浮游纤维主要受牵伸区工艺、隔距、皮辊状态影响，不是锭带松的直接后果。"},{"id":272,"type":"single","stem":"细纱接头时，若纱条尾端捻回尚未退净就进行捻接，接头处最可能出现什么质量缺陷？","options":["接头粗节，捻度分布不匀","接头细节，强力偏高","接头处纤维完全平行，无捻度","接头长度明显缩短，无粗细节"],"answer":[0],"explanation":"知识点是接头操作中退捻与加捻的配合。退捻不净时纤维端互相缠绕叠加，捻接后形成粗节，捻度分布不匀，故A正确；B细节和强力偏高与未退净捻回不符；C纤维完全平行只有在退净捻回再捻接才可能接近，此情形下不会出现；D接头长度缩短不是未退净捻回的主要表现。"},{"id":273,"type":"single","stem":"细纱机牵伸区中，皮辊加压不足时，对牵伸效果最直接的影响是下列哪一项？","options":["握持力不足，须条滑移造成条干恶化","皮辊转速升高，牵伸倍数增大","罗拉隔距自动缩小，牵伸力增大","纱线捻度下降，捻不匀增大"],"answer":[0],"explanation":"知识点是皮辊加压与握持力、牵伸质量的关系。加压不足使皮辊对须条握持力下降，纤维滑移，条干恶化，故A正确；B皮辊转速由传动决定，加压不足不会使其升高；C罗拉隔距由机械设定，不会自动缩小；D捻度由锭子与罗拉转速比决定，与皮辊加压无直接关系。"},{"id":274,"type":"single","stem":"粗纱在细纱机后区退绕时出现意外牵伸，通常与下列哪项因素关系最直接？","options":["粗纱捻度偏小且退绕张力过大","细纱锭速设定偏低","细纱前罗拉加压偏大","细纱纲领板升降动程偏小"],"answer":[0],"explanation":"知识点是后区意外牵伸的成因。粗纱捻度小、抱合力差，退绕张力又大时，后区须条被拉长，产生意外牵伸，故A正确；B锭速偏低不直接导致后区意外牵伸；C前罗拉加压偏大影响的是前区牵伸，不是退绕意外牵伸的主因；D纲领板动程影响卷绕成形，与后区意外牵伸无直接关系。"},{"id":275,"type":"single","stem":"细纱挡车工在巡回中发现个别锭子断头后，正确的处理顺序是下列哪一项？","options":["先拔清锭翼内残留纱尾，再接头，后清理绒辊","先接头，再拔清锭翼内残留纱尾，后清理绒辊","先清理绒辊，再接头，后拔清锭翼内残留纱尾","先拔清锭翼内残留纱尾，再清理绒辊，后接头"],"answer":[0],"explanation":"知识点是断头处理的规范顺序。应先清除锭翼内残留纱尾，防止飞花卷入影响接头质量，再接头，最后清理绒辊，故A正确；B先接头会受残留纱尾干扰；C清理绒辊应放在接头之后，顺序颠倒；D接头是核心步骤，不应放在清理绒辊之后。"},{"id":276,"type":"single","stem":"细纱机锭子与筒管配合过松，在高速运转时最容易引发下列哪种现象？","options":["筒管跳动，纱线张力波动，成形不良","锭子转速下降，捻度普遍不足","牵伸区须条滑移，条干恶化","纲领板升降失灵，管纱脱圈"],"answer":[0],"explanation":"知识点是筒管与锭子配合对运转稳定性的影响。配合过松时筒管在高速下跳动，张力波动，成形变差，故A正确；B筒管松不会使锭速普遍下降；C牵伸区滑移是皮辊加压问题；D纲领板升降由成形机构控制，与筒管配合松无直接因果。"},{"id":277,"type":"single","stem":"细纱机在纺制某品种时，发现成纱捻度普遍偏小，经检查锭速正常，最应优先复查下列哪项？","options":["前罗拉实际转速是否偏高","锭带是否打滑导致锭速虚高","纲领板升降是否过慢","绒辊是否积花过多"],"answer":[0],"explanation":"知识点是捻度公式中锭速与前罗拉线速度的关系。锭速正常而捻度偏小，说明前罗拉线速度偏大，应复查前罗拉转速，故A正确；B锭速已确认正常，锭带打滑与前提不符；C纲领板升降影响卷绕成形，不改变捻度；D绒辊积花影响飞花和条干，不直接改变捻度。"},{"id":278,"type":"single","stem":"某挡车工在细纱机开车后听到个别锭子有周期性异响，且该锭管纱成形出现规律性凸起，最可能的故障环节是下列哪一项？","options":["该锭子轴承磨损或锭杆弯曲","该锭纲领板升降齿轮缺油","该锭皮辊表面有轻微凹陷","该锭导纱钩位置偏高"],"answer":[0],"explanation":"知识点是锭子运转异常与管纱成形的关联。周期性异响伴规律性凸起，说明锭子回转不稳，多因轴承磨损或锭杆弯曲，故A正确；B纲领板升降问题会影响整台或整面成形，不是单锭周期性；C皮辊凹陷影响条干，不产生管纱规律凸起；D导纱钩偏高影响气圈和张力，不造成这种规律性凸起。"},{"id":279,"type":"single","stem":"细纱机在正常纺纱时，导纱钩位置过高，对气圈和断头的影响是下列哪一项？","options":["气圈变大，张力波动，断头增多","气圈变小，张力稳定，断头减少","气圈不变，捻度增大，断头减少","气圈变小，捻度减小，断头增多"],"answer":[0],"explanation":"知识点是导纱钩位置与气圈形态、张力的关系。导纱钩过高使气圈变大，张力波动加剧，断头增多，故A正确；B气圈不会变小且张力不稳；C导纱钩不影响捻度大小；D气圈变小与导纱钩过高不符，捻度也不由导纱钩决定。"},{"id":280,"type":"multi","stem":"细纱挡车工在巡回中发现成纱条干出现规律性竹节，下列哪些原因需要排查？","options":["皮辊表面有周期性凹陷或损伤","罗拉有弯曲或偏心","粗纱本身存在规律性粗细节","锭带张力偏松导致锭速波动","纲领板升降动程偏小"],"answer":[0,1,2],"explanation":"知识点是规律性竹节的成因排查。皮辊周期性凹陷、罗拉弯曲偏心、粗纱本身规律性粗细节都会造成规律性竹节，故A、B、C正确；D锭带张力偏松主要影响捻度和锭速稳定性，形成的是捻不匀而非规律性竹节；E纲领板升降动程偏小影响卷绕成形，不产生规律性竹节。"},{"id":281,"type":"single","stem":"细纱机开车时锭子尚未达到正常转速就放下钢领板，最容易造成下列哪种后果","options":["产生大量细节接头","纱线捻度偏大","管纱成形松软","小辫子纱或断头增加"],"answer":[3],"explanation":"知识点：开车顺序与锭速配合。锭速未正常就放钢领板，纱线张力突变易形成小辫子纱并增加断头；捻度偏大与锭速无关；细节接头由接头操作引起；成形松软与卷绕张力有关，不是该动作的直接后果。"},{"id":282,"type":"single","stem":"细纱接头时，将纱尾与须条搭接后应从下列哪个位置开始引纱加捻","options":["须条根部紧靠罗拉钳口处","搭接处后方已加捻的纱段上","须条前端游离纤维的尖端","皮辊与皮圈之间的空档处"],"answer":[0],"explanation":"知识点：接头引纱位置。从须条根部靠罗拉钳口引纱能使捻度向须条传递、接头牢固；从已加捻纱段引纱会使捻度无法回传；从游离纤维尖端引纱搭接不实；皮辊皮圈空档处不是加捻传递的起点。"},{"id":283,"type":"single","stem":"挡车工发现细纱断头集中在同一锭子且反复出现，检查纱线断口呈齐头状，最可能的原因是","options":["钢丝圈磨损严重","锭子振动过大","导纱钩起槽","粗纱本身有细节"],"answer":[2],"explanation":"知识点：断口形态与部件故障对应。导纱钩起槽会割断纱线形成齐头断口；钢丝圈磨损多造成毛羽增多或断头不齐；锭子振动断口多为磨断状；粗纱细节造成的断头断口呈细节拉断的不齐状。"},{"id":284,"type":"single","stem":"细纱工序中，钢丝圈号数选用的主要依据是","options":["粗纱定量和锭速","纱线号数和锭速","钢领直径和温湿度","车间相对湿度和粗纱捻度"],"answer":[1],"explanation":"知识点：钢丝圈选配。钢丝圈号数决定气圈张力和纱线张力，需依据纱线号数与锭速匹配；粗纱定量影响牵伸不直接决定钢丝圈；钢领直径影响卷装但与号数选择关系次要；温湿度影响张力但非主要选配依据。"},{"id":285,"type":"single","stem":"细纱牵伸区中，皮圈的作用是","options":["控制纤维运动并形成附加摩擦力界","对须条进行直接加压握持","改变牵伸倍数的大小","清除须条中的短绒杂质"],"answer":[0],"explanation":"知识点：皮圈牵伸原理。皮圈通过上下皮圈接触形成附加摩擦力界，控制纤维运动；皮圈本身不直接加压握持，加压由罗拉承担；牵伸倍数由罗拉速度比决定；皮圈不具备除杂功能。"},{"id":286,"type":"single","stem":"细纱落纱后生头时，纱线在钢丝圈和导纱钩之间发生纠缠成团，最恰当的处理是","options":["直接开慢车将纠缠拉直","取下钢丝圈重新穿纱生头","加大气圈张力冲开纠缠","用纱剪剪断后重新接头"],"answer":[1],"explanation":"知识点：生头异常处理。纠缠成团多因穿纱路径错误，应取下钢丝圈按正确路径重新穿纱生头；直接开车会拉断或损伤纱线；加大张力无法解开纠缠；单纯剪断不排查路径问题会再次发生。"},{"id":287,"type":"single","stem":"细纱机牵伸罗拉加压不足时，最可能出现的质量问题是","options":["粗节和细节增多","捻度不匀增大","管纱直径偏大","钢丝圈磨损加快"],"answer":[0],"explanation":"知识点：罗拉加压与牵伸质量。加压不足使须条握持力不够，纤维变速不匀，产生粗细节；捻度不匀与锭速和捻度传动有关；管纱直径与卷绕成形有关；钢丝圈磨损与张力、速度相关。"},{"id":288,"type":"single","stem":"细纱车间相对湿度过低时，对细纱生产的主要影响是","options":["断头率上升且飞花增多","捻度明显偏大","皮辊容易绕花","钢丝圈使用寿命延长"],"answer":[0],"explanation":"知识点：温湿度对细纱的影响。湿度过低纤维抱合力差、静电增加，断头和飞花增多；捻度由锭速决定不受湿度明显影响；皮辊绕花多因湿度过高或皮辊表面状态差；钢丝圈寿命不会因此延长。"},{"id":289,"type":"single","stem":"细纱接头操作中，接头速度过快但纱尾留得过长，最容易造成的后果是","options":["接头处出现大粗节","接头处捻度不足","接头处强力偏高","接头处出现细节"],"answer":[0],"explanation":"知识点：接头纱尾长度与质量。纱尾过长搭接后多余纤维聚集形成粗节；捻度不足多因加捻时间不够；强力偏高不符合实际；细节多因搭接纤维不足或牵伸过度。"},{"id":290,"type":"single","stem":"细纱机巡回看台中，挡车工发现某锭子气圈明显比邻锭大且抖动，首先应检查的是","options":["该锭钢丝圈是否过轻或磨损","该锭粗纱是否用完","该锭锭子是否缺油","该锭导纱钩是否松动"],"answer":[0],"explanation":"知识点：气圈异常的判断。气圈过大抖动多因钢丝圈过轻或磨损导致张力不足；粗纱用完表现为纱线变细断头；锭子缺油多引起振动和异响但气圈形态变化不同；导纱钩松动影响纱线通道，气圈变化不是首要特征。"},{"id":291,"type":"single","stem":"细纱机纺制纯棉精梳纱时，前罗拉钳口到导纱钩之间的纺纱段张力过大，最直接的后果是下列哪一项","options":["细纱断头率明显上升","成纱毛羽指数显著下降","钢丝圈磨损速度减慢","牵伸效率大幅提高"],"answer":[0],"explanation":"知识点是细纱纺纱张力与断头的关系。纺纱段张力过大会使纱线承受的张力超过其强力，断头增多，故正确项是断头率上升；毛羽指数通常随张力增大而增加而非下降；钢丝圈磨损随张力增大而加快而非减慢；牵伸效率主要由牵伸工艺决定，与纺纱段张力无直接正相关。"},{"id":292,"type":"single","stem":"挡车工在细纱机上进行接头操作时，将纱条捻入罗拉钳口后应先做下列哪个动作","options":["先引纱绕导纱钩再引入钢丝圈","先挂钢丝圈再引纱绕导纱钩","先绕导纱钩再挂钢丝圈最后引纱","先引纱入钢丝圈再绕导纱钩"],"answer":[0],"explanation":"知识点是细纱接头操作顺序。正确顺序是先引纱绕导纱钩，再引入钢丝圈并接头，这样纱路顺畅、张力可控，故正确项是先引纱绕导纱钩再引入钢丝圈；先挂钢丝圈会使纱条张力失控易断；先绕导纱钩再挂钢丝圈最后引纱顺序颠倒导致纱条无法正常穿入；先引纱入钢丝圈再绕导纱钩会造成纱路交叉、接头失败。"},{"id":293,"type":"single","stem":"细纱机牵伸区中，中罗拉与后罗拉之间的牵伸称为后区牵伸，后区牵伸倍数一般应控制为下列哪种范围","options":["略大于1倍","等于前区牵伸倍数","大于总牵伸倍数","等于总牵伸倍数"],"answer":[0],"explanation":"知识点是细纱牵伸区分配。后区牵伸主要起整理作用，一般略大于1倍，故正确项是略大于1倍；等于前区牵伸倍数会破坏牵伸分配；大于或等于总牵伸倍数均不符合工艺常理，总牵伸是各区牵伸的乘积。"},{"id":294,"type":"single","stem":"在细纱车间，挡车工处理断头时采用“找头—引纱—接头”三步法，其中“找头”环节的主要目的是下列哪一项","options":["在管纱上找到断纱的纱尾","在罗拉钳口找到须条断头","在钢丝圈处找到断纱位置","在导纱钩处找到纱条缠绕点"],"answer":[0],"explanation":"知识点是细纱断头处理程序。找头是在管纱上找到断纱纱尾以便引纱接头，故正确项是在管纱上找到断纱的纱尾；须条断头在罗拉钳口是牵伸区断头，处理方式不同；钢丝圈处和导纱钩处是纱路检查点，不是找头的主要目的。"},{"id":295,"type":"single","stem":"细纱机采用较大直径钢丝圈时，与较小直径钢丝圈相比，下列哪项变化是正确的","options":["纱线张力增大，断头倾向增加","纱线张力减小，断头倾向减少","纱线捻度增大，毛羽减少","纱线捻度减小，毛羽增加"],"answer":[0],"explanation":"知识点是钢丝圈直径与纺纱张力的关系。较大直径钢丝圈质量大，离心力大，纱线张力增大，断头倾向增加，故正确项是张力增大断头倾向增加；张力减小与事实相反；捻度和毛羽主要由锭速、钢领钢丝圈配合等决定，不因钢丝圈直径直接反向变化。"},{"id":296,"type":"single","stem":"某细纱车间气温骤降，挡车工发现断头率上升且纱条发脆，最可能的原因是下列哪一项","options":["车间相对湿度过低导致纤维回潮率下降","车间相对湿度过高导致纤维粘连","锭速突然升高导致捻度偏大","钢丝圈号数偏小导致张力不足"],"answer":[0],"explanation":"知识点是温湿度对细纱断头的影响。气温骤降常伴随相对湿度降低，纤维回潮率下降、纱条发脆，断头率上升，故正确项是相对湿度过低；湿度过高会使纤维粘连、牵伸不良，但不会使纱条发脆；锭速突然升高和钢丝圈号数偏小均不会造成纱条发脆。"},{"id":297,"type":"single","stem":"挡车工在巡回中发现某锭子纱条在导纱钩处反复缠绕，检查导纱钩无毛刺，下一步应优先检查下列哪一项","options":["该锭子钢丝圈是否磨损或号数不当","该锭子罗拉隔距是否偏大","该锭子胶辊是否偏心","该锭子锭带是否过长"],"answer":[0],"explanation":"知识点是导纱钩处缠绕的原因排查。导纱钩无毛刺时，缠绕多因钢丝圈磨损或号数不当造成张力异常，故正确项是检查钢丝圈；罗拉隔距偏大影响牵伸不直接造成导纱钩缠绕；胶辊偏心造成周期性粗细节；锭带过长影响传动，均非首选。"},{"id":298,"type":"single","stem":"细纱机纺制纯棉精梳纱时，前罗拉钳口到导纱钩之间的纺纱段出现大量毛羽，经检查粗纱捻度偏大、细纱后区牵伸倍数偏小，此时应优先调整的是","options":["适当加大细纱后区牵伸倍数","适当减小细纱后区牵伸倍数","降低粗纱捻度并同步减小后区牵伸","提高细纱前区牵伸倍数并加压前胶辊"],"answer":[0],"explanation":"知识点：细纱后区牵伸与粗纱捻度的配合。粗纱捻度偏大时纤维间抱合力强，若后区牵伸倍数偏小，捻回重分布不足，须条在牵伸区易扩散、边缘纤维失控，形成毛羽。正确项加大后区牵伸可削弱捻回重分布的不利影响，使须条在牵伸区更紧密。错误项减小后区牵伸会加剧捻回重分布不足；降低粗纱捻度同时减小后区牵伸方向相反，不能解决当前矛盾；提高前区牵伸与加压前胶辊针对的是前区牵伸力问题，与本例后区牵伸配置不当不对应。"},{"id":299,"type":"single","stem":"某细纱挡车工在巡回中发现锭子突然断头，断口呈明显须状且伴有少量回丝缠绕在罗拉钳口，下列处置程序中最合理的是","options":["先关车取净罗拉钳口回丝，再接头并检查牵伸区","直接拔起纱管接头，接头后再清理回丝","先接头保产量，回丝留待下一轮巡回处理","先落纱换管，再统一处理该锭位断头"],"answer":[0],"explanation":"知识点：细纱断头的规范处置程序。断口须状且罗拉钳口有回丝，说明牵伸区已受干扰，必须先关车清除回丝再接头，否则接头质量差且会重复断头。错误项先接头后清理会使回丝继续影响牵伸；先接头保产量会导致接头失败或产生疵纱；落纱换管再处理会错过该锭位异常判断且不解决即时断头。"},{"id":300,"type":"multi","stem":"细纱接头操作中，影响接头强力和外观质量的关键动作包括","options":["解捻时手指捻向与纱条捻向配合","接头时纱尾长度控制在合理范围","接头后引纱速度与罗拉输出速度匹配","接头前将纱条在导纱钩处反复摩擦","接头后立即用手指按压接头处定型"],"answer":[0,1,2],"explanation":"知识点：细纱接头操作要领。解捻时手指捻向与纱条捻向配合可使纤维端充分分散并相互抱合；纱尾长度合理能保证搭接纤维数量；引纱速度与罗拉输出速度匹配可避免接头处粗细不匀或细节。错误项在导纱钩处反复摩擦会损伤纤维并增加毛羽；接头后立即按压会破坏刚形成的捻回结构，造成接头强力下降。"}]}