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中国石油大学12春《工程流体力学》第一阶段在线作业习题+答案

中国石油大学12春《工程流体力学》第一阶段在线作业习题+答案
中国石油大学12春《工程流体力学》第一阶段在线作业习题+答案

第一阶段在线作业

单项选择题

第1题整个机油质量300kg,油桶直径0.6m,高1.2m,机油的密

度是

A、545.62kg/m3

B、723.45kg/m3

C、884.64 kg/m3

第2题在油罐里充满石油,压力1105N/m2 ,然后再强行注入质量为20kg的石油后,压力增至5105N/m2 石油的弹性模量是 K=1.32109N/m2 (K=1/p) 密度=880kg/m3,该油罐的容积是多大

A、45.23 m3

B、74.07 m3

C、85.36 m3

第3题两平行平板的间距h=1mm,其中充满油,当两板的相对运动速度=1.2m/s时,作用于板上的切应力为3500N/ m2, 油的粘度是多少

A、2.92 Pa.s

B、2.17 Pa.s

C、1.68 Pa.s

第4题若水的体积弹性系数K=2.0109N/m2,是水的体积减小0.1%时,应增大多少

压强

A、31?6 Pa

B、7?06Pa

C、2?06 Pa

第5题将内径为10mm的开口玻璃管竖直插入温度为20°C的水中,此时=0.07275N/m,已知水和玻璃接触角为10°,管内水柱高度多少B

A、3.12mm

B、2.91mm

C、1.14mm

第6题一铅直矩形闸门上缘距页面h1=1m,闸门高h2=2m,宽b=1.5m 闸门上的静水总压力是多少

A、63.2kN

B、58.8 kN

C、46.3 kN

第7题已知一宽度为b=5m的矩形平板成30°倾角放置在水下,如下图板上下缘深度分别是h=1m,H=3m,求上板所受的静水压力的作用点

A、4.33m

B、9.65m

C、2.12m

第8题矩形闸门AB宽为2m,区域C在大气压下,水面在铰链上方2m,其中l=5m,打开闸门要多大力F

A、450 kN

B、370 kN

C、620 kN

第9题下列说法中正确的是

A、液体不能承受压力

B、理想流体所受的切应力一定为

C、粘性流体所受的切应力一定为

第10题动力粘度系数的单位是

A、Pa.s

B、m2/s

C、s/m2

第11题静止流体的点压强值与无关

A、位置

B、方向

C、流体的密度

第12题静止的水仅受重力作用时,其测压管水头线

必为

A、水平线

B、向下直线

C、斜线

第13题流场中除奇点和驻点外,关于流线的说法中正确的是

A、稳定流场中的流线不随时间变化

B、稳定流场中流线和迹线不会重合

C、流场中流线密的地方流速小,而流线稀的地方流速大

第14题欧拉平衡方程适用于

A、仅理想流体

B、仅粘性流体

C、对理想流体和粘性流体均适用

第15题关于流线的说法中正确的是

A、流线可以相交

B、流线就是迹线

C、流线不可以相交

判断题

第16题当温度升高时液体的动力粘度系数μ一般会升高

正确

错误

第17题当温度降低时液体的动力粘度系数μ一定会升高

正确

错误

第18题当温度升高时气体的动力粘度系数一般会

降低

正确

错误

第19题流体受到压力作用时,就会发生连续不断的变形即

流动

正确

错误

第20题流体在切力作用下会连续不断的变形,一般不能保持一定的形状

正确

错误

第21题体积膨胀系数是指代表温度每增加1℃时所发生的体积绝对变化量

正确

错误

第22题体积压缩系数是指代表压力每增加1Pa时所发生的体积相对变化量

正确

错误

第23题质量力作用于流体的每一质点上

正确

错误

第24题在液体与固体相接触的表面上,也会产生附

着力

正确

错误

第25题压力体中必须充满液体

正确

错误

第26题不存在虚的压力体

正确

错误

第27题阿基米德原理无论对于完全潜没在液体的潜体或漂浮有液面上的浮体都是正确的

正确

错误

第28题无论是绝对压力还是相对压力,都不能小

于0

正确

错误

第29题相对压力也称为表压

正确

错误

第30题控制体与外界可以有能量的交换,但不能有质量的

交换

正确

错误

第31题系统与外界既不能有能量交换,也不能有质量

交换

正确

错误

第32题把某一质点在连续的时间过程内所占据的空间位置连成线,就是迹线

正确

错误

第33题欧拉法是流场法

正确

错误

第34题流体质点所在空间位置的变化而引起的速度变化率,称为迁移加速度

正确

错误

第35题系统的形状可以变化,但是位置不可以

变化

正确

错误

多项选择题

第36题在构成压力体的各个表面中,包括以下

A、液体自由表面

B、承受压力的曲线

C、承压曲面边线向上垂直延伸至自由液面平面的各个表面第37题以下属于金属测压计的有

A、水银测压计

B、弹簧管式测压计

C、膜片式测压计

第38题欧拉平衡方程式适用于

A、静止状态的流体

B、相对静止状态的流体

C、加速状态的流体

第39题以下不属于动力粘度的单位有

A、泊

B、斯

C、cP

第40题关于粘性的表述中正确的有

A、粘性指的是流体微团发生相对运动时产生的法向阻力

B、粘性是流体中发生机械能量损失的原因

C、粘性流体流动时将产生内摩擦力

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