Engineering Board Exam Reviewer · Fluid Mechanics · easy

A weir is used to:

1. Measure pressure in pipes
2. Increase velocity in pipes
3. Measure or control flow in open channels
4. Prevent water hammer

Answer

C. Measure or control flow in open channels

Solution

Flow over a weir is related to the head above the crest, e.g., Q = 1.84 L H3/2 for a rectangular weir (SI, Francis).

More Fluid Mechanics questions

1. Open channel flow with a Froude number greater than 1 is called:
2. A sudden rise in water surface when supercritical flow changes to subcritical flow is called a:
3. The hydraulic radius of a channel is defined as:
4. Manning's formula is used for:
5. The Hazen–Williams formula is commonly used for:
6. For pipes connected in parallel:
7. Losses in pipe fittings, valves, bends and sudden changes in cross section are called:
8. The chart that relates the friction factor to the Reynolds number and relative roughness is the:
9. For laminar flow in a circular pipe, the Darcy friction factor is:
10. The Darcy–Weisbach equation is used to compute:

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