化工原理(1)(全英文) 知到智慧树答案2024 z40177
绪论 单元测试
1、 The unit operation of separation of gas mixture based on the difference of components’solubility is . 利用气体各组分在液体中的溶解度的不同而实现气体分离的单元操作是。( )
A:Distillation 精馏
B:Absorption吸收
C:Adsorption吸附
D:Extraction萃取
答案: Absorption吸收
2、
Please judge which following unit operation belongs to mass transfer? 请判断哪个单元操作属于质量传递? ( )
A:Filtration 过滤
B:Settling 沉降
C:Distillation 精馏
D:Heating 加热
答案: Distillation 精馏
3、 Which unit operation belongs to heat transfer? 哪个单元操作属于热量传递?( )
A:Cooling 冷却
B:Settling 沉降
C:Transportation of fluids 流体输送
D:Stirring 搅拌
答案: Cooling 冷却
4、
As we all know, “three transfers” is a very important concept, which includes momentum, heat, and mass transfer, now judge which following unit operation belongs to momentum transfer? 总所周知,三传是非常重要的概念,它包括动量、热量和质量传递,请判断哪个单元操作属于动量传递?( )
A:Distillation精馏
B:Cooling 冷却
C:Absorption吸收
D:Transportation of fluids 流体输送
答案: Transportation of fluids 流体输送
5、
Some unit operations just include 1 transfer, however others maybe include 2 or 3 transfers at the same time, please indicate the unit operation below that exists mass and heat transfers meanwhile?一些单元操作只存在一种传递,有些则同时存在2到3种单元操作,请指出下面哪个单元操作既属于质量传递同时也属于热量传递?( )
A:Distillation精馏
B:Cooling 冷却
C:Heating加热
D:Transportation of fluids 流体输送
答案: Distillation精馏
第一章 单元测试
1、 Gas is a compressible fluid. 气体是一种可压缩性的流体。( )
A:对
B:错
答案: 对
2、 When the absolute pressure of the measured fluid is greater than the external atmospheric pressure, the pressure gauges used are called. 当被测流体的绝对压强大于外界大气压强时,所用的测压仪表称为。( )
A:Vacuum gauge真空表
B:Speedometer速度表
C:Liquid Level Meter液位计
D:Manometer压强表
答案: Manometer压强表
3、 The reading of the vacuum gauge indicates the quantity that the absolute pressure of the measured fluid is lower than the atmospheric pressure, which is called. 真空表上的读数表示被测流体的绝对压强低于绝对压强的读数,称为.( )。
A:Vacuum degree真空度
B:Gauge pressure表压强
C:Relative pressure相对压强
答案: Vacuum degree真空度
4、
18660 Pa equals to ___mmHg? 18660Pa等于多少mmHg? ( )
A:700mmHg
B:500mmHg
C:140mmHg
D:100mmHg
答案: 140mmHg
5、
Pressure can be expressed by absolute pressure, gauge pressure and vacuum gauge, if the reading of vacuum gauge in the equipment is 100 mmHg, try to calculate the absolute pressure. Given that the atmospheric pressure in this area is 740mmHg, then what is the absolute pressure?压强可以表示为绝对压强、表压和真空度,某设备真空表的读数是100 mmHg ,假设当地大气压为740 mmHg,那它的绝对压强是多少?( )
A:200 mmHg
B:640 mmHg
C:840 mmHg
D:500 mmHg
答案: 640 mmHg
第二章 单元测试
1、 In a Hagen-Poiseuille flow, i.e. laminar pressure-driven flow in a circular pipe, if the pressure drop is doubled, the average and maximum velocities will _. 在哈根-泊谡叶流中,当压降变为原来的两倍时,流体的平均和最大速度会___。( )
A:remain constant 保持不变
B:both double 均变为原来2倍
C:average velocity will double, while maximum velocity will become four times as large 平均速度变为2倍,最大速度变为4倍
D:both become four times均变为原来4倍
E:average velocity will quadruple, while maximum velocity will double平均速度变为4倍,最大速度变为2倍
答案: both double 均变为原来2倍
2、 Boundary layer occurs in _. 边界层存在于___。( )
A:laminar, transitional and turbulent flows 层流、湍流和过渡流中
B:laminar flow only 仅存在于层流中
C:turbulent flow only仅存在于湍流中
D:transitional flow only仅存在于过渡流中
E:transitional and turbulent flows only 仅存在于过渡流和湍流中
答案: laminar, transitional and turbulent flows 层流、湍流和过渡流中
3、 The continuum hypothesis of fluid mechanics assumes that fluid can be _. 流体力学的连续性假设是说,流体可以___。( )
A:divided into molecules and atoms 被划分为分子和原子
B:subject to thermal fluctuations 受到热扰动的影响
C:gas or liquid 是气体或液体
D:divided infinitely 被无限划分
E:none of the rest 其他都不对
答案: divided infinitely 被无限划分
4、 A fluid flow may be laminar, turbulent or transitional, depending on its _. 流体流动究竟是层流、过渡流还是湍流,取决于___。( )
A:Reynolds number 雷诺数
B:Froude number 福禄数
C:Bernoulli number 柏努利数
D:Prandtl number 普朗特数
E:none of the rest 其他均不对
答案: Reynolds number 雷诺数
5、 To solve for the velocity distribution of a viscous flow, we should use _. 对于黏性流体,欲求得其速度分布,应该采用___。( )
A:Bernoulli equation 柏努利方程
B:Euler equation 欧拉方程
C:Navier-Stokes equation 奈维-斯托克斯方程
D:Darcy-Weisbach equation 达西-瓦斯巴赫方程
E:Colebrook-White equation 科尔布鲁克-怀特方程
答案: Navier-Stokes equation 奈维-斯托克斯方程
6、 A liquid flows from a pipe of diameter into a pipe of diameter . The minor loss coefficient is _. 某液体从直径为D的管道流入直径为2D的管道,其局部阻力系数K是 ___. ( )
A:1/2
B:1/4
C:3/4
D:9/16
E:none of the rest 其他均不对
答案: 9/16
7、 A liquid flow is first divided into three separate pipe flows and later they merge into a single stream again. In this process, the total head loss is _. 某股液流先分为三股,随后又汇为一股。在此过程中,总压头损失为___. ( )
A:1/3 of the initial total head 原总压头的1/3
B:half of the initial total head 原总压头的一半
C:the sum of head losses in all three pipes 三个分支管路中压头损失之和
D:zero 零
E:none of the rest 其他均不对
答案: none of the rest 其他均不对
第三章 单元测试
1、 Which of the following valves is an essential part of reciprocating pumps? 下列哪种阀门是容积泵的重要组成部分之一?( )
A:Gate valve 闸阀
B:Ball valve 球阀
C:Check valve 逆止阀
D:Globe valve 截止阀
E:Plug cock 旋塞阀
答案: Check valve 逆止阀
2、 Increasing the total power of a centrifugal pump will most likely cause the developed head to _. 增大离心泵的总功率最有可能导致泵压头___. ( )
A:decrease 下降
B:increase 上升
C:remain constant 不变
D:too little information to determine 无法判断
E:none of the rest 其余都不对
答案: decrease 下降
3、 Which of the following devices needs priming? 下列哪种设备在使用前须灌泵 ( )
A:Piston pump 活塞泵
B:Diaphragm pump 隔膜泵
C:Spur-gear pump 外齿轮泵
D:Volute pump 螺旋泵
E:Plunger pump 柱塞泵
答案: Volute pump 螺旋泵
4、 Which of the following correctly lists gas-moving devices in ascending order in terms of their power (in general)? 以下哪个选项是按由小到大的顺序将气体输送设备的功率范围加以排列的?( )
A:Fan < Positive-displacement Blower < Centrifugal Blower < Positive-displacement Compressor < Centrifugal Compressor 风机 < 容积式鼓风机 < 离心式鼓风机 < 容积式压缩机 < 离心式压缩机
B:Fan < Positive-displacement Blower < Positive-displacement Compressor < Centrifugal Blower < Centrifugal Compressor 风机 < 容积式鼓风机 < 容积式压缩机 < 离心式鼓风机 < 离心式压缩机
C:Fan < Centrifugal Blower < Centrifugal Compressor < Positive-displacement Blower < Positive-displacement Compressor 风机 < 离心式鼓风机 < 离心式压缩机 < 容积式鼓风机 < 容积式压缩机
D:Fan < Positive-displacement Blower < Centrifugal Blower < Centrifugal Compressor < Positive-displacement Compressor风机 < 容积式鼓风机 < 离心式鼓风机 < 离心式压缩机 < 容积式压缩机
E:none of the rest 其余均不对
答案: Fan < Positive-displacement Blower < Positive-displacement Compressor < Centrifugal Blower < Centrifugal Compressor 风机 < 容积式鼓风机 < 容积式压缩机 < 离心式鼓风机 < 离心式压缩机
5、 We normally prefer gas compression to be _, so that it can be done more easily. 从简易可操作性出发,我们通常希望希望气体压缩过程是___。( )
A:polytropic 多方的
B:adiabatic 绝热的
C:isothermal 恒温的
D:isochoric 恒容的
E:isobaric 恒压的
答案: isothermal 恒温的
6、 Which of the following statements about flow meters is FALSE? 以下关于流量计的哪种说法是错误的? ( )
A:The Venturi meter has fixed cross section areas, but varying pressure drop; while rotameter is the opposite 文丘里管利用恒定的横截面积和变动的压降来测量流量;转子流量计则相反。
B:The Venturi meter cannot measure velocity distribution in a flow. 文丘里管无法测量流体的速度分布。
C:The Pitot tube cannot measure the overall rate of a flow. 皮托管无法测量流体的总流量。
D:The rotameter measures the overall flow rate. 转子流量计可以测量流体总流量。
E:In a rotameter, the float reaches equilibrium when drag force balances its gravity. 在转子流量计中,当转子达到平衡态时,它所受的曳力与重力相平衡。
答案: In a rotameter, the float reaches equilibrium when drag force balances its gravity. 在转子流量计中,当转子达到平衡态时,它所受的曳力与重力相平衡。
下方是付费阅读内容:本平台商品均为虚拟商品,无法用作二次销售,不支持退换货,请在购买前确认您需要购买的资料准确无误后再购买,望知悉!
完整答案需点击上方按钮支付5元购买,所有答案均为章节测试答案,无期末答案。购买后上方矩形框将出现已付费的隐藏内容。
点关注,不迷路,微信扫一扫下方二维码
关注我们的公众号:阿布查查 随时查看答案,网课轻松过
为了方便下次阅读,建议在浏览器添加书签收藏本网页
电脑浏览器添加/查看书签方法
1.按键盘的ctrl键+D键,收藏本页面
2.下次如何查看收藏的网页?
点击浏览器右上角-【工具】或者【收藏夹】查看收藏的网页
手机浏览器添加/查看书签方法
一、百度APP添加/查看书签方法
1.点击底部五角星收藏本网页
2.下次如何查看收藏的网页?
点击右上角【┇】-再点击【收藏中心】查看
二、其他手机浏览器添加/查看书签方法
1.点击【设置】-【添加书签】收藏本网页
2.下次如何查看收藏的网页?
点击【设置】-【书签/历史】查看收藏的网页