工程流体力学（山东大学） 知到智慧树答案2024 z39875

第一章 单元测试

1、 Examples of primary quantities are which of the following?（ ）。

A:Size, Density, and Texture
B:Length, Mass, and Chemical Structure
C:Length, Time, Mass, and Temperature
D:None.
答案: Length, Time, Mass, and Temperature

2、 Which of the following selections are all British Gravitational System units?（ ）。

A:foot, pound, Newton, gallon
B:foot, second, pound, Rankin, and slug
C:foot, liter, Kelvin, Celsius, and pound
D:foot, minute, liter, Celsius, and kg
答案: foot, second, pound, Rankin, and slug

3、 Specific volume is the reciprocal of what measurement?（ ）。

A:volume
B:gravity
C:density
D:mass
答案: density

4、 How can the absolute pressure be found by using the gage pressure?（ ）。

A:by adding the gage pressure and the atmospheric pressure
B:by using the equation P = ρRT
C:by subtracting the atmospheric pressure from the gage pressure
D:can not
答案: by adding the gage pressure and the atmospheric pressure

5、 Fluids for which the shearing stress is not linearly related to the rate of shearing strain are designated as what?（ ）。

A:viscous fluids
B:Newtonian fluid
C:non-Newtonian fluid
D:None
答案: non-Newtonian fluid

第二章 单元测试

1、 For a body partially submerged in a fluid and at equilibrium, which of the following is a true statement?（ ）。

A:The weight of the body is equal to the weight of the volume of fluid displaced
B:The weight of the body is less than the weight of the volume of fluid displaced
C:The weight of the body is greater than the weight of the volume of fluid displaced
D:The specific gravity of the body is greater than the specific gravity of the fluid
答案: The weight of the body is equal to the weight of the volume of fluid displaced

2、 An inclined-tube manometer is being used as shown to measure the pressure in a pressurized tank. The tank is partially filled to a depth of 20 cm with a fluid of specific gravity = 0.78. The specific gravity of the manometric gage fluid is 3.5. The gage pressure in the headspace (kPa) when h = 8 cm is most nearly（ ）。

A:0.3
B:0.9
C:1.2
D:1.8
答案: 0.3

3、 A clean glass tube is to be selected in the design of a manometer to measure the pressure of kerosene. Specific gravity of kerosene = 0.82 and surface tension of kerosene = 0.025 N/m. If the capillary rise is to be limited to 1 mm, the smallest diameter (cm) of the glass tube should be most nearly（ ）。

A:1.25
B:1.50
C:1.75
D:2.00
答案: 1.25

4、 The figure shows two cylinders of diameter D and 2D, connected to each other and containing an incompressible fluid. The two cylinders are fitted with leak-proof pistons of weight W1 and W2 as shown. Which of the following is a correct expression?（ ）。

A:＝
B:=
C:=
D:=

答案: =

5、 The figure shows the relationship between shear stress and velocity gradient for two fluids, A and B. Which of the following is a true statement?（ ）。

A:Absolute viscosity of A is greater than that of B
B:Absolute viscosity of A is less than that of B
C:Kinematic viscosity of A is greater than that of B
D:Kinematic viscosity of A is less than that of B

答案: Absolute viscosity of A is greater than that of B

第三章 单元测试

1、 If a flow is unsteady, its ____ may change with time at a given location.（ ）。

A:Velocity
B:Temperature
C:Density
D:All of the above
答案: All of the above

2、 If the flow is steady, there can be changes in velocity at different locations in the flow field, True or False?（ ）

A:对
B:错
答案: 对

第四章 单元测试

1、 A fixed coordinate system is non-inertial. True or False? （ ）

A:对
B:错
答案: 错

2、 According to the sign convention, mass flowrate out of the control volume is negative and the mass flowrate in is positive. True or False? （ ）

A:对
B:错
答案: 错

4、 When using Newton’s second law applied across streamlines and the Bernoulli equation it is important to be sure ____. （ ）。

A:that the pressure gradients do not change
B:that all of the assumptions are not violated
C:that the flow will never leave the streamlines
D:All of the above
答案: that all of the assumptions are not violated

5、 The Bernoulli equation can be written in terms of heights called what? （ ）。

A:heads
B:levels
C:elevations
D:meters
答案: heads

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