[Yuyue Education] Wuhan University of Technology Fluid Mechanics and Fluid Machinery Reference Materials

Education
-Fluid Mechanics and Fluid Machinery-Chapter Materials Examination Materials-Wuhan University of Technology []
Unit Test
1, [Single Choice Question] The forces acting on the fluid are divided into ( ) two types
A, mass force and surface force
B, gravity and Pressure
C, external force and internal force
D, inertial force and pressure
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2. [Single-choice question] static fluid ( ) shear stress
A, can withstand small
B, can withstand
C, cannot withstand
D, has viscosity Reference
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3. [Single-choice question] The viscosity of gas and liquid increases with temperature ( )
A, decrease, decrease
B, decrease, increase
C, increase, decrease
D , Increase, increase
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Working
unit test
1. 【Single-choice question】The starting basis for relative pressure is:
A. Absolute vacuum
B. 1 standard atmospheric pressure
C. Local atmospheric pressure
D. Liquid surface pressure
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2. [Single-choice question] The reading value of the metal pressure gauge is:
A. Absolute pressure
B. Relative pressure
C. Absolute pressure plus local atmospheric pressure
D. Relative pressure plus local atmospheric pressure
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3. [Single-choice question] The vacuum pressure at a certain point is 65 000 Pa, and the local atmospheric pressure is 0.1 MPa. The absolute pressure at this point is: A
, 65 000 Pa
B, 55 000 Pa
C, 35 000 Pa
D, 165 000 Pa
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4. [Single-choice question] The pressure distribution law in the static flow field:
A. Only applicable to incompressible fluids
B. Only applicable to ideal fluids
C. Only applicable to viscous fluids
D. Applicable to both ideal fluids and Applicable to viscous fluid
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Homework
Unit test
1. [Single-choice question] According to the ( ) needed to describe the flow parameters, it can be divided into one-dimensional, two-dimensional and three-dimensional flow A
, time
B, spatial position
C, and spatial coordinates Number
D. Number of total variables
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2. [Single-choice question] The following ( ) is not a property of streamlines
A. Streamlines cannot intersect but can be tangent
B. Streamlines can intersect at stagnation points or singular points
C . When the flow is stable, the streamline and the track coincide.
D. When the flow is unstable, the streamline and the track do not coincide.
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3. [Single-choice question] The constant flow is:
A. The flow changes according to a certain law with time
B. Each The moving elements on the space point do not change with time
C, the velocity distribution of each flow section is the same
D, the migration acceleration is zero
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4. [Fill in the blank] The two methods of describing fluid motion are:
A.
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Homework
unit test
1. [Single-choice question] The change of the total water head line of viscous fluid along the way is:
A. Falling along the way
B. Along the way C.
Keep the level
D. The first three situations are all possible.
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2. [Single-choice question] The change of the water head line of the viscous fluid piezometer along the way is:
A. Decline along the way
B. Rise along the way
C , maintain level
D, the first three situations are all possible
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Unit test
1, [Single-choice question] Among the following groups of physical quantities, the ones that belong to the same dimension are:
A, velocity, density, viscosity
B, pressure, time , temperature
C, length, pipe diameter, piezometer water head
D, pressure, velocity, acceleration
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2, [Single-choice question] The dimensions of force per unit mass are:
A,
B,
C,
D,
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3. [Single-choice question] The Reynolds number is an important dimensionless number to distinguish which of the following flow states:
A, rapid flow and slow flow
B, uniform flow and non-uniform flow
C, laminar flow and turbulent flow
D, constant flow and non-uniform flow Constant flow
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Job
Unit test
1. [Single-choice question] In circular pipe flow, the cross-sectional flow velocity distribution of laminar flow conforms to:
A. Uniform law
B. Straight line change law
C. Parabolic law
D. Logarithmic curve law
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2. [Single Topic selection] In the circular pipe flow, the cross-sectional flow velocity distribution of turbulent flow conforms to:
A, uniform law
B, straight line change law
C, parabolic law
D, logarithmic curve
law
The velocity distribution profile of the flow is relatively flat in the center and the velocity gradient near the wall is relatively large
A, correct
B, incorrect
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4. 【Judgment】Viscosity is the root cause of the energy loss of liquid flow movement
A. Correct
B. Incorrect
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Homework
unit test
1. [Fill in the blank] The main components of the centrifugal pump have the following three parts: , , .
A.
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2. [Fill in the blank] When the installation height of the centrifugal pump exceeds the allowable When the installation height is high, the phenomenon of ____________ will occur in the centrifugal pump
A.
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Operation
unit test
1. [Fill in the blank] The actual working cycle of the reciprocating compressor is determined by ____,, ________, four levels of composition
A,
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2. 【Fill in the blank】The working principle of a reciprocating compressor is similar to that of a __________ pump .
A.
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