This set of Fluid Mechanics Multiple Choice Questions & Answers (MCQs) focuses on “Manning’s Equation – 1”.

1. A rectangular channel is having depth 2m and width 3m, bed slope of 1 in 700. The value of manning’s roughness co efficient (n) is 0.06, estimate the discharge through the channel.

a) 2.42m^{3}⁄s

b) 3.42m^{3}⁄s

c) 4.42m^{3}⁄s

d) 5.42m^{3}⁄s

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2. Estimate the discharge through a triangular channel having depth 7m and side slope 1H:5V in which the bed slope is 1 in 1000. Manning’s co efficient = 0.03.

a) 8.07m^{3}⁄s

b) 9.07m^{3}⁄s

c) 10.07m^{3}⁄s

d) 11.07m^{3}⁄s

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3. The base width and the depth of a trapezoidal channel is 9m and 5m respectively. Calculate the discharge through a channel if the side slope of the channel is 1H:4V and the bed slope is 1 in 500. (n=0.04)

a) 109.73m^{3}⁄s

b) 110.73m^{3}⁄s

c) 111.73m^{3}⁄s

d) 112.73m^{3}⁄s

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4. A circular channel section has diameter of 6m and it is running half. Calculate the discharge through the channel if the bed slope is 1 in 600 and manning’s co efficient is equal to 0.014.

a) 52m^{3}⁄s

b) 53m^{3}⁄s

c) 54m^{3}⁄s

d) 55m^{3}⁄s

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5. The diameter of a circular channel section which is running full is 8m. Determine the discharge through the channel section if the bed slope is 1 in 600 and the value of the manning’s co efficient is 0.013.

a) 249.45m^{3}⁄s

b) 250.45m^{3}⁄s

c) 251.45m^{3}⁄s

d) 252.45m^{3}⁄s

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6. The area of a channel section is 8m^{2} and the wetted perimeter is 8m. Calculate the value of the bed slope of the channel if the discharge is 33.33m^{3}⁄s and manning’s co efficient is 0.012.

a) 1 in 300

b) 1 in 400

c) 1 in 500

d) 1 in 600

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7. The area of the triangular section is 66.67m^{2} and the wetted perimeter of the section is 24.03m. Calculate the value of the manning’s roughness co efficient if the bed slope of the channel section is 1 in 500 and the discharge through the channel is 117.61m^{3}⁄s.

a) 0.03

b) 0.04

c) 0.05

d) 0.06

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8. The discharge through a trapezoidal channel is 245.06m^{3}⁄s and the bed slope is 1 in 1000. Calculate the value of the wetted area if the hydraulic radius is 2.26m. Manning’s roughness co efficient = 0.008.

a) 34m^{2}

b) 35m^{2}

c) 36m^{2}

d) 37m^{2}

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9. Determine the value of manning’s constant for a rectangular channel if Chezy’s constant is equal to 50 and the depth and widths of the channel are 4m and 7m respectively.

a) 0.012

b) 0.022

c) 0.032

d) 0.042

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10. The side slope of a triangular channel section is 1H:4V and the depth is 12m. Calculate the value of chezy’s constant if the value of manning’s constant is 0.03.

a) 32.48

b) 33.48

c) 34.48

d) 35.48

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11. Determine the value of Chezy’ s constant for a trapezoidal channel having depth 3m, base width 11m, side slope 1H:3V and the manning’s co efficient is 0.012.

a) 94.15

b) 94.25

c) 94.35

d) 94.45

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12. Estimate the value of the manning’s constant for a fully running circular section having diameter of 8m and the value of Chezy’s constant is 50.

a) 0.022

b) 0.032

c) 0.042

d) 0.052

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**Sanfoundry Global Education & Learning Series – Fluid Mechanics.**

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