第二章单元测试
- For a body partially submerged in a fluid and at equilibrium, which of the following is a true statement?（ ）。
- 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 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（ ）。
- 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?（ ）。
- 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:The specific gravity of the body is greater than the specific gravity of the fluid
B:The weight of the body is greater than the weight of the volume of fluid displaced
C:The weight of the body is less than the weight of the volume of fluid displaced
D:The weight of the body is equal to the weight of the volume of fluid displaced
答案:The weight of the body is equal to the weight of the volume of fluid displaced
A:0.3
B:1.2
C:1.8
D:0.9
答案:0.3
A:1.75
B:2.00
C:1.50
D:1.25
答案:1.25
A:
=
B:
=
C:
＝
D:
=
答案:
=A:Absolute viscosity of A is less than that of B
B:Absolute viscosity of A is greater 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
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