[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$fFVywqpU9XUOwwSdqDVY4AM5qzCH6vR-BuOrvytFeV0Y":3},{"answer":4,"createTime":5,"id":6,"options":7,"origin":12,"question":19,"related":20,"source":30,"type":31},[],"2023-06-08 21:56:59",54040670,[8,9,10,11],"压力差和容器截面","压力差和介质密度","压力差、容器截面和介质密度","压力差、介质密度和取压点位置",{"count":13,"courseId":14,"courseImg":15,"courseName":16,"workId":17,"workName":18},24,"71b037a7f75b5005864edf7ff9487949","https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F9c1e48361b00f3ee2086f4e259ed792b.jpg","现代检测技术-2022-2023-2学期（自动化21-1-2）","work_27912094","测验4","用差压法测量容器液位时,液位的高低取决于( )",[21,32,35,44,53,59,68,77,86,95],{"answer":22,"createTime":5,"id":23,"options":24,"question":29,"source":30,"type":31},[],54040669,[25,26,27,28],"浮力式","差压式","电容式","超声波式","以下物位计,是以非接触式方式来实现测量的是( )","v1",0,{"answer":33,"createTime":5,"id":6,"options":34,"question":19,"source":30,"type":31},[],[8,9,10,11],{"answer":36,"createTime":5,"id":37,"options":38,"question":43,"source":30,"type":31},[],54040671,[39,40,41,42],"时间","速度","频率","强度","超声波物位计是通过测量声波发射和反射回来的( )差来测量物位高度的",{"answer":45,"createTime":5,"id":46,"options":47,"question":52,"source":30,"type":31},[],54040672,[48,49,50,51],"普通静压式液位计","法兰式液位计","浮子式液位计","电容式物位计","对于黏性大、易结晶介质的液位测量,可采用下列哪种物位检测仪表?( )",{"answer":54,"createTime":5,"id":55,"options":56,"question":58,"source":30,"type":31},[],54040673,[25,26,27,57],"磁致伸缩式","以下形式的物位计,既可以用于检测液位,也可以用于检测固体的料位的是( )",{"answer":60,"createTime":5,"id":61,"options":62,"question":67,"source":30,"type":31},[],54040674,[63,64,65,66],"10m","6m","4m","12m","DDZ-III型差压变送器的输出信号为4~20mA的标准直流电流.DDZ-III型差压变送器的正、负压室分别与容器下部和上部的取压点相连通,并保证变送器的正压室与零液位等高,如图所示.因此,当 液位高度H=0 时,差压 Δp =0.假设液位变化范围为H=0~16m,即当液位高度H=0时,差压变送器的输出为I=4 mA; 当液位高度H=Hmax=16mA时,差压变送器的输出为I=20 mA.差压变送器的输出电流 I 与液位H 呈线性关系.则当差压变送器的输出为10mA时,液位高度H=? \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F32ea2491d9ad511bb2b62c2a9da9d045.png\">",{"answer":69,"createTime":5,"id":70,"options":71,"question":76,"source":30,"type":31},[],54040675,[72,73,74,75],"不需要调整","需要重新调整零点,差压计需进行负迁移,迁移量为h1ρ1g,不需要调整量程","需要重新调整零点,差压计需进行负迁移,迁移量为h2ρ1g,不需要调整量程","需要重新调整零点,差压计需进行正迁移,迁移量为(h1+h2)ρ1g,不需要调整量程","用双法兰液位计测量容器内的液位,如图所示,开始时差压计安装在与容器下部引压口同一水平线上,并调整好差压计的零点和量程.后来因维护需要将差压计的安装位置上移了 h1 距离,则该是否差压计需要重新调整零点和量程,才能保证液位测量的正确性? \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F099e02490063a45f9afb9444057662e0.png\">",{"answer":78,"createTime":5,"id":79,"options":80,"question":85,"source":30,"type":31},[],54040676,[81,82,83,84],"差压变送器需进行负迁移,迁移量为16758Pa.根据差压变送器的量程系列和差压的变化量,可选16kPa的量程.迁移后该差变的测量范围为:−16.758kPa~ −0.758kPa","差压变送器需进行负迁移,迁移量为21168Pa.根据差压变送器的量程系列和差压的变化量,可选16kPa的量程.迁移后该差变的测量范围为:−16.758kPa~ −0.758kPa","差压变送器需进行负迁移,迁移量为21168Pa.根据差压变送器的量程系列和差压的变化量,可选25kPa的量程.迁移后该差变的测量范围为:−21.168kPa~ 3.832kPa","差压变送器需进行负迁移,迁移量为21168Pa.根据差压变送器的量程系列和差压的变化量,可选25kPa的量程.迁移后该差变的测量范围为:−16.758kPa~ 8.242kPa","\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F12925dffde327207daa7f75718d88ba0.png\">",{"answer":87,"createTime":5,"id":88,"options":89,"question":94,"source":30,"type":31},[],54040677,[90,91,92,93],"差压变送器需要进行负迁移,迁移量为26.714kPa.当液位在0~2m内变化时,差压变化量为 h2ρg=2×840×9.807=16475.76Pa.根据差压变送器量程系列,可选差变的量程为25kPa","差压变送器需要进行负迁移,迁移量为36.714kPa.当液位在0~2m内变化时,差压变化量为h2ρg=2×840×9.807=16475.76Pa.根据差压变送器量程系列,可选差变的量程为25kPa","差压变送器需要进行负迁移,迁移量为46.714kPa.当液位在0~2m内变化时,差压变化量为h2ρg=2×840×9.807=16475.76Pa根据差压变送器量程系列,可选差变的量程为25kPa","差压变送器需要进行负迁移,迁移量为36.714kPa.当液位在0~2m内变化时,差压变化量为h2ρg=2×840×9.807=16475.76Pa根据差压变送器量程系列,可选差变的量程为16kPa","使用差压变送器测量某容器内的液位.已知差压变送器的正压室对应的引压管内的介质与容器内的液体相同,介质密度为840kg\u002Fm3,负压室引压管内充水,密度为1000kg\u002Fm3,液体最低高度与差压变送器之间的距离为h3=1.4m,液位变化范围h2=2m,液位最高处与容器上部引压管之间的距离为h1=0.5m,求差压变送器的量程和迁移量(g=9.807m\u002Fs2). \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fc0cfff8ac53020df11414c11e946a137.png\">",{"answer":96,"createTime":5,"id":97,"options":98,"question":103,"source":30,"type":31},[],54040678,[99,100,101,102],"差压变送器需要进行负迁移,负迁移量为26577Pa.差压的测量范围为-26577Pa~-9905.1Pa","差压变送器需要进行负迁移,负迁移量为16577Pa.差压的测量范围为-16577Pa~-9905.1Pa","差压变送器需要进行正迁移,正迁移量为26577Pa.差压的测量范围为-26577Pa~-9905.1Pa","差压变送器需要进行正迁移,正迁移量为16577Pa.差压的测量范围为-16577Pa~-9905.1Pa","如图所示,用差压变送器测量闭口容器的液位,h1=50cm,h2=200cm,h3=140cm,被测介质的密度ρ1=0.85cm\u002Fcm3,负压管内的隔离液为水,重力加速度g=9.807m\u002Fs2,求变送器的测量范围和迁移量. \u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F59eb925a9f7b55dc32a6aa00b14c2310.png\">"]