2021 泵与风机(东北大学) 最新满分章节测试答案

本答案对应课程为:点我自动跳转查看
本课程起止时间为:2021-03-26到2021-07-26
本篇答案更新状态:已完结

Unit 1 介绍 Introduction 介绍 Introduction

1、 问题:Working medium in pump is liquid, but in fan is gas.
选项：
A:正确
B:错误
答案: 【正确】

Unit 2 分类和基本性能参数 Classification and basic performance parameters 分类 Classification

1、 问题:The sortation of pump includes two kinds of ( )
选项：
A:paddle type pump
B:displacement type pump
C:ejector
D:reciprocating pump
答案: 【paddle type pump;
displacement type pump;
ejector】

Unit 2 分类和基本性能参数 Classification and basic performance parameters 基本性能参数 Basic performance parameters

1、 问题:Static power denotes that the actual power acted on fluid, which is equal to the sum of effective power and loss power.
选项：
A:正确
B:错误
答案: 【错误】

2、 问题:Please translate the following words: Flow rate, Energy head,Power and efficiency, Speed rate,Static pressure.
答案: 【Flow rate, Energy head,Power and efficiency, Speed rate,Static pressure.】

Unit 4 能量方程 Energy equation 能量方程的分析 Analysis of energy equation

1、 问题:Measures to imroving the theoretical head with infinite blade include
选项：
A:Increase impeller outer diameter
B:decrease impeller outer diameter
C:inrease rotating speed of impeller
D:decrease rotating speed of impeller
答案: 【Increase impeller outer diameter;
inrease rotating speed of impeller】

2、 问题:The head of axial flow impeller is lower than that of centrifugal impeller.
选项：
A:正确
B:错误
答案: 【正确】

Unit 4 能量方程 Energy equation 实际能头和总压的计算 Calculation of actual head and total pressure

1、 问题:please translate the following words: Spring vacuum gauge,U-tube mercury differential manometer
答案: 【弹簧真空测压计，U型管水银差压计】

Unit 4 能量方程 Energy equation 叶片数为有限数时理论能头的修正 Correction of theoretical head with limited number of bl

1、 问题:Which is the effect of infinite number of blades on theoretical head?
选项：
A:Changing the velocity triangle
B:Forming pressure difference at both sides of blade
C:reducing the theoretical head
D:decreasing the velocity of inlet
答案: 【Changing the velocity triangle;
Forming pressure difference at both sides of blade;
reducing the theoretical head】

2、 问题:When the number of blades is limited, the flow is strictly guided by blade surface.
选项：
A:正确
B:错误
答案: 【错误】

Unit 5 流体运动和速度三角形 Fluid motion and velocity triangle 离心式叶轮流体运动和速度三角形 Fluid motion and velocity trian

1、 问题:The forms of fluid motion in impeller include
选项：
A:Circular motion
B:Relative motion
C:Vertical motion
D:Absolute motion
答案: 【Circular motion;
Relative motion;
Absolute motion】

2、 问题:The assumptions when drawing projection are ( in English)
答案: 【Infinite blades, ideal fluid, incompressible fluid, steady flow, axisymmetric flow】

Unit 5 流体运动和速度三角形 Fluid motion and velocity triangle 轴流式叶轮流体运动和速度三角形 Fluid motion and velocity trian

1、 问题:Compared to the centrifugal impeller, the similaritiy of axial and centrifugal impeller is that the absulote velocity at inlet and outlet is same.
选项：
A:正确
B:错误
答案: 【错误】

Unit 6 离心式叶轮型式分析 Analysis of types of centrifugal impeller 离心式叶轮型式分析 Analysis of types of centrifu

1、 问题:Three types of centrifugal impeller are
答案: 【backard curved, radial tipped, forward curve】

Unit 7 轴向力 Axial force 轴向力 Axial force

1、 问题:Please select the proper method for balancing axial force.
选项：
A:Balance hole
B:Double suction impeller
C:Asymmetrical arrangement
D:balancing disc and balancing drum
E:balance pipe
答案: 【Balance hole;
Double suction impeller;
balancing disc and balancing drum;
balance pipe】

Unit 8 损失和效率 Loss and efficiency 机械损失和机械效率 Mechanical loss and mechanical  efficiency

1、 问题:Mechanical loss includes: at , or .
答案: 【loss power, shaft/shaft seal, shaft/ bearings, disc friction】

Unit 8 损失和效率 Loss and efficiency 容积损失和容积效率 Volume loss and volume efficiency

1、 问题:The volume loss of pump could be generated at the gap of balancing axial force device and shaft seal.
选项：
A:正确
B:错误
答案: 【正确】

Unit 8 损失和效率 Loss and efficiency 流动损失和流动效率 Flow loss and flow efficiency

1、 问题:Which statement is true about impact loss?
选项：
A:The flow loss is composed of impact loss ad loacal loss.
B:The impact loss only has the positive value.