This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Geometrical Properties of Triangular Section – 1”.

1. What is the wetted area for a triangular channel having depth y and the side slope being Z?

a) Zy^{2}

b) 2Zy

c) Zy

d) Z^{2} y

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Explanation:

The Area of the Triangle = (½) (base) (height)

Base = Zy+Zy = 2Zy

Area = (1/2) (2Zy) (y)

Area = Zy

^{2}.

2. Calculate the wetted perimeter of a triangular section having depth y and the side slope is Z.

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3. Calculate the wetted perimeter of a triangular section having a depth of 4m and the side slope is1H:1V.

a) 7.94m

b) 8.94m

c) 9.94m

d) 10.94m

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4. Estimate the wetted area of a triangular channel having a depth of 5m and the side slope is 2H:1V.

a) 50m^{2}

b) 60m^{2}

c) 70m^{2}

d) 80m^{2}

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Explanation: Wetted area = Zy

^{2}

= 2(5

^{2})

= 50m

^{2}.

5. What is the top width of a triangular channel having a depth y and side slope Z?

a) Zy

b) Zy^{2}

c) 2Zy

d) ½Zy

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Explanation: Top width = (Zy+Zy)

= 2Zy.

6. Determine the hydraulic depth of a triangular channel having the side slope Z and depth y.

a) y

b) y/2

c) 2y

d) y_{2}

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7. Estimate the top width of a triangular channel having a side slope of 1H:2V and depth of 5m.

a) 4m

b) 5m

c) 6m

d) 7m

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Explanation: Top Width = 2Zy

Top Width = (2)(1/2)(5)

Top Width = 5m.

8. What is the Hydraulic Radius of a triangular channel having a depth y and side slope Z?

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9. What is the section factor for a triangular channel having depth y and side slope Z?

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10. Calculate the section factor a triangular channel section having side slope 1H:4V and depth of 8m.

a) 32

b) 34

c) 36

d) 38

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