Virtual Labs

1. Compared with the pipe in which it is provided, an orifice generally has:

a: Smaller diameter Explanation

Explanation

b: Equal diameter Explanation

Explanation

c: Larger diameter Explanation

Explanation

d: Infinite diameter Explanation

Explanation

2. The point where the jet attains minimum cross-sectional area after emerging from an orifice is called:

a: Hydraulic jump Explanation

Explanation

b: Vena contracta Explanation

Explanation

c: Stagnation point Explanation

Explanation

d: Critical section Explanation

Explanation

3. An orifice is primarily used to:

a: Measure viscosity Explanation

Explanation

b: Increase fluid density Explanation

Explanation

c: Control and discharge fluid from a tank Explanation

Explanation

d: Measure atmospheric pressure Explanation

Explanation

4. An orifice is classified as a large orifice when:

a: The head over the center of the orifice is less than five times its depth Explanation

Explanation

b: The orifice diameter is equal to the pipe diameter Explanation

Explanation

c: The orifice is located near the free surface Explanation

Explanation

d: The diameter exceeds one meter Explanation

Explanation

5. Which coefficient is defined as the ratio of area of jet at vena contracta to area of the orifice?

a: Coefficient of velocity Explanation

Explanation

b: Coefficient of contraction Explanation

Explanation

c: Coefficient of discharge Explanation

Explanation

d: Coefficient of friction Explanation

Explanation

6. According to Torricelli's theorem, the theoretical velocity of flow through an orifice is:

a: √(gh) Explanation

Explanation

b: gh² Explanation

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c: √(2gh) Explanation

Explanation

d: 2gh Explanation

Explanation

7. The coefficient of discharge for an orifice is equal to:

a: Coefficient of contraction × Coefficient of velocity Explanation

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b: Coefficient of velocity ÷ Coefficient of contraction Explanation

Explanation

c: Coefficient of contraction + Coefficient of velocity Explanation

Explanation

d: Coefficient of friction × Coefficient of velocity Explanation

Explanation

8. At the vena contracta section, the pressure is approximately:

a: Much greater than atmospheric pressure Explanation

Explanation

b: Equal to atmospheric pressure Explanation

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c: Vacuum pressure Explanation

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d: Independent of flow conditions Explanation

Explanation

9. Which quantity is experimentally determined to evaluate the coefficient of velocity of an orifice?

a: Jet trajectory coordinates Explanation

Explanation

b: Pipe roughness Explanation

Explanation

c: Specific gravity of water Explanation

Explanation

d: Atmospheric pressure Explanation

Explanation

Orifices Experiment