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Fluid Mechanics Practice Test: Orifices, Mouthpieces, Notches and Weirs
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Orifices, Mouthpieces, Notches and Weirs topics include: Orifice, notches and weirs classification, large orifice flows, discharge over notches or weirs, time required to empty reservoir with notches and weirs. In fluid mechanics, an orifice is a plate with a round hole in the center that is inserted into a line. Orifices are used as fixed throttles that create head loss. The head loss caused by an orifice can be used to determine the volume or mass rate of flow during flow metering.  Here are some other fluid mechanics concepts: Mouthpiece: A small tube or pipe attached to a tank's... Show more
Fluid Mechanics Practice Test: Orifices, Mouthpieces, Notches and Weirs
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25 Questions

1. In discharge of water over narrow crested weir, discharge is directly proportional to the cube root of acceleration due to gravity.
2. The head of water over a rectangular weir is 28 cm. The length of the crest of the weir end contraction suppressed is 1.27 m. Find the discharge using the Francis formula.
3. The time taken to empty the tank is independent of Cd but depends only on the height and acceleration due to gravity.
4. Trapezoidal weir has another popular name. What is it?
5. Find the discharge over a cipolletti weir of length 1.3 m when the head over the weir is 0.65 m. Take Cd = 0.60.
6. For discharge over ogee weir discharge is directly proportional to length but for discharge over narrow crested weir it is inversely proportional to length.
7. When is orifice called ‘large orifice’?
8. A rectangular orifice of 2 m width and 1.2 m deep is fitted in one side of large tank. The easier level on one side of the orifice is 3m above the top edge of the orifice while on the other side of the orifice the water level is 0.5 m below it’s top edge. Calculate discharge if Cd = .64
9. Find the discharge through a rectangular orifice 2.2 m wide and 1.3 m deep fitted to a easier tank. The water level in a team is 2.5 m above the top edge of orifice.
10. In Bazin’s formula, the discharge is inversely proportional to the length of weir.
11. The nature of discharge is also a way of classifying notches.
12. What is not the way of classifying weir based on their shape of crest?
13. The discharge rate is independent of the height difference and dependent only on the height.
14. Which of the following is not a way of classifying notches or weirs?
15. Find the discharge through a rectangular orifice 3.2 m wide and 1.7 m deep fitted to a easier tank. The water level in a team is 3.3 m above the top edge of orifice. Take Cd = 0.6
16. The expression for discharge for a right angled notch is more complex than rectangular notch.
17. The head of water over a rectangular weir is 28 cm. The length of the crest of the weir end contraction suppressed is 1.27 m. Find the discharge using the Francis formula.
18. The head of water over a rectangular weir is 26 cm. The length of the crest of the weir end contraction suppressed is 1.25 m. Find the discharge using the Francis formula.
19. Find the discharge through a rectangular orifice 2.2 m wide and 1.3 m deep fitted to a easier tank. The water level in a team is 2.5 m above the top edge of orifice.
20. In discharge of water over narrow crested weir, discharge is directly proportional to the second power of height.
21. Find the discharge over triangular notch of angle 50° when the head over the V notch
22. In case of any orifice, velocity always remains constant and hence discharge can be calculated.
23. The discharge rate is independent of the height difference and dependent only on the height.
24. The time taken to empty the tank is independent of Cd but depends only on the height and acceleration due to gravity.
25. A notch is a device used to measure the turbulence of the flowing liquid directly.

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