MOOC Hydraulic Power(Chang'an University)1461589169 最新慕课完整章节测试答案
Chapter 1 Introduction to Hydraulic and Pneumatic Transmission
文章目录
- Chapter 1 Introduction to Hydraulic and Pneumatic Transmission
- Chapter 2 Fundamental Hydraulic Fluid Mechanics
- Chapter 3 Hydraulic Pumps
- Chapter 4 Hydraulic Actuators
- Chapter 5 Hydraulic Control Valves
- Chapter 6 Auxiliary Components for Hydraulic Systems
- Chapter 7 Basic Hydraulic Circuits
- Chapter 8 Examples of Hydraulic Systems
Test
1、单选题:
Which of the following is not an advantage of the hydraulic system ( )
选项:
A: With the same size structure, the hydraulic system can deliver greater power
B: Small inertia, rapid starting and braking, smooth movement
C: Convenient for stepless speed regulation, wide speed regulation range
D: Higher transmission efficiency
答案: 【 Higher transmission efficiency】
2、单选题:
Which of the following is not a disadvantage of the hydraulic system ( )
选项:
A: Cannot be used for high precision transmission
B: Overload protection is not easy to achieve
C: High precision requirements for component manufacturing
D: Difficulty in troubleshooting
答案: 【 Overload protection is not easy to achieve】
3、单选题:
Which of the following is a hydraulic power element ()
选项:
A: Pump
B: Motor
C: Cylinder
D: Relief valve
答案: 【 Pump】
4、单选题:
Which of the following is a hydraulic control element ( )
选项:
A: Pump
B: Motor
C: Cylinder
D: Relief valve
答案: 【 Relief valve】
5、单选题:
Which of the following is a rotational hydraulic execute element ( )
选项:
A: Pump
B: Motor
C: Cylinder
D: Relief valve
答案: 【 Motor】
6、判断题:
Hydraulic system cannot be used for high precision transmission.
选项:
A: 正确
B: 错误
答案: 【 正确】
7、判断题:
With the same size structure, the hydraulic system can deliver greater power.
选项:
A: 正确
B: 错误
答案: 【 正确】
8、判断题:
The hydraulic system has high precision requirements for component manufacturing.
选项:
A: 正确
B: 错误
答案: 【 正确】
9、判断题:
It is difficult in troubleshooting of hydraulic system.
选项:
A: 正确
B: 错误
答案: 【 正确】
10、判断题:
Hydraulic system is convenient for stepless speed regulation.
选项:
A: 正确
B: 错误
答案: 【 正确】
11、判断题:
Hydraulic system has high power transmission efficiency.
选项:
A: 正确
B: 错误
答案: 【 错误】
12、判断题:
Water can be used as hydraulic transmission media.
选项:
A: 正确
B: 错误
答案: 【 错误】
13、判断题:
Hydraulic motor gives rotationally movements in hydraulic system.
选项:
A: 正确
B: 错误
答案: 【 正确】
14、判断题:
Hydraulic cylinder is a power element in hydraulic system.
选项:
A: 正确
B: 错误
答案: 【 错误】
15、判断题:
Hydraulic media can be any fluid.
选项:
A: 正确
B: 错误
答案: 【 错误】
16、填空题:
The hydraulic transmission system is composed of the following parts, which are ?
答案: 【 __power element__, __execution element__ and __control element__, __auxiliary element__ and __working medium__.
】
17、填空题:
The hydraulic power element convert the ____ to ____.
答案: 【 mechanical power hydraulic power】
18、填空题:
The execution element convert the ____ to ____.
答案: 【 hydraulic power mechanical power】
19、填空题:
Hydraulic pump is a typical _____ in hydraulic system .
答案: 【 power element】
20、填空题:
Hydraulic cylinder is a typical ____ in hydraulic system .
答案: 【 power element】
21、填空题:
Hydraulic cylinder outputs ____.
答案: 【 linear movement】
22、填空题:
Hydraulic motor outputs ____.
答案: 【 rotational movement】
23、填空题:
Hydraulic control element regulate the ____ 、___ and ____ of the hydraulic oil .
答案: 【 pressure flow rate flow direction】
24、填空题:
Hydraulic transmission is of ____ efficiency.
答案: 【 low】
25、填空题:
Hydraulic transmission is ____ to be protected from overload.
答案: 【 low】
Chapter 2 Fundamental Hydraulic Fluid Mechanics
Test
1、单选题:
Liquid is a
continuous medium. That is, the motion parameters of liquid can be regarded as
a continuous function of ( ), and it is possible to use analytical mathematics
to describe its motion law.
选项:
A: It has nothing to do
with time and space
B: Time and space
C: Just time
D: Just space
答案: 【 Time and space】
2、单选题:
In the case of ( ), the influence of liquid compressibility on performances of hydraulic system cannot be ignored.
选项:
A: When studying static performances of system
B: When studying dynamic performances of system
C: Under high pressure
D: Under low pressure
答案: 【 When studying dynamic performances of system】
3、单选题:
( ) has a great influence on the compressibility of liquid.
选项:
A: Gas mixed with liquid
B: Impurities mixed into liquid
C: The viscosity of liquid
D: Density of liquid
答案: 【 Gas mixed with liquid】
4、单选题:
The hydrostatic pressure is always along the ( ) direction of liquid acting surface.
选项:
A: Tangent
B: Outer normal
C: Not sure
D: Inner normal
答案: 【 Inner normal】
5、单选题:
The relationship between relative pressure, absolute pressure and atmospheric pressure is( ).
选项:
A: Relative pressure = absolute pressure + atmospheric pressure
B: Absolute pressure = relative pressure-atmospheric pressure
C: Atmospheric pressure = absolute pressure + relative pressure
D: Relative pressure = absolute pressure-atmospheric pressure
答案: 【 Relative pressure = absolute pressure-atmospheric pressure】
6、单选题:
A curve of the motion state of various particles in liquid flow at a time is called ( ).
选项:
A: Trace
B: Waterline
C: Quality line
D: Streamline
答案: 【 Streamline】
7、单选题:
Since any mass point in the flowing liquid can only have one speed at a certain time, there is ( ) between the streamlines.
选项:
A: Impossible to intersect, may make a sudden turn
B: It is impossible to intersect, and it is impossible to make a sudden turn
C: It may intersect, but it is impossible to make a sudden turn
D: May intersect, or suddenly turn
答案: 【 It is impossible to intersect, and it is impossible to make a sudden turn】
8、单选题:
The velocity of the actual liquid on the flow section ( ).
选项:
A: Each point is different, showing a parabolic distribution
B: The points are different, distributed in a triangle
C: Each point is different and the distribution law is uncertain
D: All points are the same
答案: 【 Each point is different, showing a parabolic distribution】
9、单选题:
When liquid flows, the particles have no lateral pulsation and do not interfere with each other. The hierarchical flow state that is oriented and not mixed is called ( ).
选项:
A: Turbulence
B: Laminar flow
C: Advection
D: Turbulence
答案: 【 Laminar flow】
10、单选题:
The energy loss of liquid in the equal-diameter straight pipe along the flow direction due to the internal friction between the fluid layers is called ( ).
选项:
A: Energy loss along the way
B: Local energy loss
C: Pressure loss
D: Flow loss
答案: 【 Energy loss along the way】
11、多选题:
Which of the following characteristics does liquid have:( )
选项:
A: Homogeneity
B: Continuity
C: Not tensile
D: Easy flow
答案: 【 Homogeneity;
Continuity;
Not tensile;
Easy flow】
12、多选题:
The main function of the working medium in the hydraulic system is:( )
选项:
A: Take away heat
B: Take away dirt
C: Transfer energy
D: Lubricate
答案: 【 Take away heat;
Take away dirt;
Transfer energy;
Lubricate】
13、多选题:
The commonly used forms of pressure units are:( )
选项:
A: Force per unit area
B: Multiple of engineering atmospheric pressure
C: Liquid column height
D: Force per unit volume
答案: 【 Force per unit area;
Multiple of engineering atmospheric pressure;
Liquid column height】
14、多选题:
Whether liquid is laminar or turbulent is related to ( ).
选项:
A: Flow rate
B: Viscosity of liquid
C: Pipe diameter
D: Density
答案: 【 Flow rate;
Viscosity of liquid ;
Pipe diameter】
15、多选题:
Local energy loss will occur under the following conditions ( ).
选项:
A: The flow section is suddenly enlarged
B: There are various hydraulic components and accessories in the flow channel
C: The flow section is suddenly reduced
D: The flow channel is bent
答案: 【 The flow section is suddenly enlarged;
There are various hydraulic components and accessories in the flow channel ;
The flow section is suddenly reduced ;
The flow channel is bent】
16、判断题:
It has good chemical
stability, that is, it has good stability to heat, oxidation, hydrolysis and
shearing. It can maintain the original chemical composition after long-term
contact with air at high temperature and high-speed passage through the gap.
选项:
A: 正确
B: 错误
答案: 【 正确】
17、判断题:
In a closed container, the pressure exerted on
the boundary of a static liquid can be equally transmitted to all directions in
liquid.
选项:
A: 正确
B: 错误
答案: 【 正确】
18、判断题:
In hydraulic transmission technology, the
static pressure caused by external force is much larger than the static
pressure caused by gravity, so the latter can usually be ignored.
选项:
A: 正确
B: 错误
答案: 【 正确】
19、判断题:
When liquid flows in a round pipe, the
velocity distribution in the turbulent flow state is more uniform than that in
the laminar flow state.
选项:
A: 正确
B: 错误
答案: 【 正确】
20、填空题:
In the oil outlet pipeline of the pump, if the absolute pressure is 10MPa, the gauge pressure is ( )MPa.
答案: 【 9.9】
21、填空题:
In the suction pipe of the pump, if the absolute pressure is 0.07MPa, the vacuum is ( )MPa.
答案: 【 0.03】
22、填空题:
The size of viscosity can be expressed by three methods: dynamic viscosity, ( ), and relative viscosity.
答案: 【 Kinematic viscosity】
23、填空题:
In addition to moving in a certain direction when liquid flows, there is also a pulsating lateral velocity, which makes liquid particles interlaced and mixed with each other. This flow state is called ( ).
答案: 【 Turbulence】
24、填空题:
According to the different causes, gap flow can be divided into three types: differential pressure flow, shear flow and ( ) flow.
答案: 【 mixing】
25、填空题:
The large Reynolds number shows that the inertial force plays a leading role, and liquid flow is in ( ) state.
答案: 【 Turbulence】
26、填空题:
Pressure loss during liquid flow can be divided into two categories, namely pressure loss along the way and ( ) Pressure loss.
答案: 【 Partial】
27、填空题:
In the hydraulic system, the oil pressure rises sharply due to a sudden change in the working state of a certain component, and a high pressure peak is suddenly generated in an instant, and the damping fluctuation process of alternating rapid pressure rise and fall is called ( ).
答案: 【 Hydraulic shock】
28、填空题:
In liquid flow, due to the pressure drop, the phenomenon of bubble formation is collectively called the ( ) phenomenon.
答案: 【 Air pocket)】
29、填空题:
The effect of liquid viscosity is to hinder the flow of liquid, and the size of viscosity is measured by ( ).
答案: 【 Viscosity】
Chapter 3 Hydraulic Pumps
test
1、单选题:
Liquid