# Fluid Mechanics Questions and Answers – Manning’s Equation – 2

This set of Tricky Fluid Mechanics Questions and Answers focuses on “Manning’s Equation – 2”.

1. The area of a circular section which is running half full is 19.625m2 and the value of the chezy’s constant is 60.
a) 0.019
b) 0.020
c) 0.021
d) 0.022

Explanation:

2. A circular section which is (3/4)th full is having a wetted perimeter of 9.42m. Calculate the value of C if n is equal to 0.025.
a) 30
b) 40
c) 50
d) 60

Explanation:

3. The dimensions of a rectangular channel section are 3m in width and 1m in depth. Calculate the average shear stress if the bed slope of the channel is 1 in 500.
a) 9.772 N/m2
b) 10.772N/m2
c) 11.772N/m2
d) 12.772N/m2

Explanation:

4. Calculate the bed slope of a triangular channel having depth 12m and side slope of 1H:6V if the average shear stress is 9.6138 N/m2.
a) 1 in 500
b) 1 in 1000
c) 1 in 1500
d) 1 in 2000

Explanation:

5. The average shear stress for a circular channel running full is 32.7N⁄m2 and the diameter of the channel is 8m then calculate the bed slope of the channel.
a) 1 in 500
b) 1 in 600
c) 1 in 700
d) 1 in 800

Explanation:
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6. Determine the average shear stress of a trapezoidal channel having base width 6m, depth 5m and side slope 1H:3V if the bed slope of the channel is 1 in 700.
a) 28.45N/m2
b) 38.45N/m2
c) 48.45N/m2
d) 58.45N/m2

Explanation:

7. Estimate the value of Chezy’s constant if the value of the friction factor is 0.031.
a) 35
b) 40
c) 45
d) 50

Explanation:

8. Calculate the average shear stress if the friction factor is 0.28 and velocity of flow is 1.5m⁄s.
a) 60N/m2
b) 70N/m2
c) 80N/m2
d) 90N/m2

Explanation:

9. Calculate the conveyance of a rectangular channel having depth 0.5m and width 0.8m. C = 50.
a) 6.42m3⁄s
b) 7.42m3⁄s
c) 8.42m3⁄s
d) 9.42m3⁄s

Explanation: Conveyance (K) = AC√R
A = By = 0.4m2
P = B+2y = 1.8m
R = 0.22m
K = 0.4(50)√0.22
K = 9.42 m3/s.

10. Determine the conveyance of a trapezoidal channel having depth 3m, width 9m, side slope 1H:2V and the manning’s co efficient is 0.03.
a) 864.79m3/s
b) 865.79m3/s
c) 866.79m3/s
d) 867.79m3/s

Explanation:

11. Determine the conveyance of a triangular section having area 30m^2 and perimeter 15m. (C = 40)
a) 1695m3/s
b) 1696m3/s
c) 1697m3/s
d) 1698m3/s

Explanation:

12. Estimate the conveyance of a circular channel of diameter 0.7m having manning’s co efficient equal to 0.012.
a) 6.83m3/s
b) 7.83m3/s
c) 8.83m3/s
d) 9.83m3/s

Explanation:

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