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【多选题】
以下接头错牙数值中,需要及时进行整改的是___?
A. 1mm
B. 2mm
C. 3mm
D. 4mm
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BCD
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拆垫垫片作业时需要带的工具包括___?
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下列属于防止线路爬行的措施有___?
A. 加强轨道的中间扣件的扣压力
B. 安装轨距杆或轨撑
C. 加强接头夹板的夹紧力
D. 在线路上进行涂油
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关于圆曲线的最小长度,以下说法错误的是___
A. 不应小于10m
B. 不应小于15m
C. 不应大于10m
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关于缓和曲线的最小长度,以下说法错误的是___
A. 50m
B. 40m
C. 30m
D. 20m
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关于正线一般情况最小曲率半径,以下说法错误的是___
A. 400m
B. 350m
C. 300m
D. 250m
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关于正线困难情况最小曲率半径,以下说法错误的是___
A. 200m
B. 250m
C. 300m
D. 350m
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关于辅助线一般情况最小曲率半径,以下说法错误的是___
A. 500m
B. 400m
C. 300m
D. 200m
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关于辅助线困难情况最小曲率半径,以下说法错误的是___
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关于车场线一般情况最小曲率半径,以下说法错误的是___
A. 300m
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C. 110m
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关于车场线困难情况最小曲率半径,以下说法错误的是___
A. 50m
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___不属于产生曲线钢轨不均匀磨耗的主要原因。
A. 曲线超高设置不当
B. 轨底坡不正确
C. 曲线方向不圆顺
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尖轨按断面形式分类中不含___尖轨。
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【多选题】
关于尖轨与基本轨不密贴原因的叙述,___是不确切的。
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B. 曲基本轨弯折点位置不对,造成转折器部分轨向不良
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关于尖轨跳动产生原因的叙述,___是不确切的。
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关于预防整治尖轨跳动措施的叙述,___是不确切的。
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关于导曲线轨距扩大的原因叙述,___是不正确的。
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B. 列车横向推力
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关于导曲线外股钢轨侧面磨耗产生的原因叙述,___是不正确的。
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关于辙叉轨距不合标准产生的原因叙述,___是不确切的。
A. 拨正直股方向
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C. 护轨轮缘槽尺寸不合标准
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无缝线路地段安排全年维修计划时,一般不考虑___。
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在线路上焊接钢轨时,气温不应低于___℃。
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当断缝小于50mm时,应立即进行紧急处理。在断缝处上好夹板或臌包夹板,用急救器固定,在断缝前后各50m拧紧扣件,并派人看守,限速放行列车速度为___。
A. 5-10km/h
B. 15-25km/h
C. 1-5km/h
D. 10-15km/h
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钢轨铝热焊焊缝接头应平整圆顺,用1m直尺测量,顶面、侧面不平度应在___以内,顶面不得有负值。
A. 0.5mm
B. 1mm
C. 1.5mm
D. 2mm
【多选题】
氧气瓶、丙烷瓶在焊接和切割火焰的上风方向和侧风方向,禁止布置在火焰的___方向的。
A. 前面
B. 上面
C. 上风
D. 下风
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丙烷瓶与明火的距离不得小于___。
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丙烷瓶与氧气瓶的距离不得小于___。
A. 3m
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在钢轨焊接中,含碳量高的钢轨比含碳量低的可焊性___。
A. 好
B. 差
C. 一样
D. 任意
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37°探头探测钢轨使用的是___。
A. 纵波
B. 横波
C. 表面波
D. 板波
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70°探头探测轨头时只有二次波显示位移量较大应___。
A. 判轻伤
B. 判重伤
C. 不判伤
D. 进行校正后确认
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超声波的波长___。
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超声波到达两个不同材料的界面上,可能发生___。
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D. 反射、折射和波形转换
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被放大的信号幅度与缺陷的反射面积成正比地增大,放大器这一非饱和的放大区域称为___。
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C. 选择范围
D. 分辨率范围
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超声波探伤仪中,产生时间基线的部分叫做___。
A. 扫描电路
B. 接收器
C. 脉冲器
D. 同步器
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探测厚焊缝中垂直于表面的缺陷最适用的方法是___。
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B. 直探头
C. 斜探头
D. 串列斜探头
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钢轨焊缝中的各种缺陷最不容易检测的缺陷有___。
A. 光斑
B. 灰斑
C. 光斑和灰斑
D. 气孔
【多选题】
探头发射脉冲声波的___是表示探头频率特性的最合理的数据。
A. 频谱
B. 频宽
C. 波长
D. 频率
【多选题】
钢轨核伤的是由哪种原因发展形成的___。
A. 气泡
B. 夹渣
C. 外部冲击伤痕
D. 以上都是
【多选题】
同种材料中,在给定频率下产生波长短的波动形式是___。
A. 纵波
B. 压缩波
C. 横波
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因表面粗糙使超声波束产生的漫射叫做___。
A. 角度调整
B. 散射
C. 折射
D. 扩散
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材料的声速与密度的乘积,可决定超声波在界面上的声能反射率与透过率,这一乘积称为___。
A. 声阻抗
B. 声速
C. 波长
D. 相位区
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一定频率的超声波通过声速低的材料时,其波长将比通过声速高的材料时___。
A. 一样
B. 增长
C. 减短
D. 成倍增长
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