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# MCQs on Manning’s Equation – 2

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

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a

Explanation:

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

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b

Explanation:

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

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c

Explanation:

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

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b

Explanation:

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

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b

Explanation:

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

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a

Explanation:

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

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d

Explanation:

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

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c

Explanation:

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

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d

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.

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

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b

Explanation:

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

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c

Explanation:

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

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d

Explanation:</p>