Test: Open Channel Flow Level - 3 - Civil Engineering (CE) MCQ

What is the width of the lined channel?

What is the total cost of the most efficient lined Trapezoidal channel to carry the given discharge report your answer is Rs. (nearest integer) for per unit meter length of channel.

In order to ensure that no scouring take place in the bed of a channel of bed slope ‘S’ constructed on alluvial soil of particle size ‘d’ m the flow velocity should be restricted to

The Chezy’s coefficient C is related to Darcy Weisbach friction factor F as

A short reach of a 3 m wide rectangular open channel has its bed level rising in the direction of flow at a slope of 1 in 10000 it carries a discharge of 5 m³ /s and its Manning’s roughness coefficient is 0.01. The flow in this reach is gradually varying. At a certain section in this reach the depth of flow was measured as 0.5 m. The rate of change of the water depth with distance dy/dx at this section is __________ (use g = 10 m/s²)

Match List-I (surface) with List-II (approximate range of Manning’s n) and select the correct answer.

List-I List-II

(a) Gravel river bed with 50 mm diameter bed 1. 0.02 to 0.022

(b) Badly maintained unlined irrigation 2. 0.025 to 0.04

channel with weed growth

(c) Concrete lined channel 3. 0.013 to 0.017

(d) Channel with brick lining 4. 0.04 to 0.08

Code: a b c d

Water surface profiles that are asymptotic at one end and terminated at the other end would include

A rectangular channel 6.5 m wide carries a discharge of 18 m³/s under uniform flow condition with normal depth of 1.8 m Manning’s n is 0.018.

The longitudinal slope of the channel is

A hump is to be provided on the channel bed. The maximum height of the hump without affecting the upstream flow condition is

The channel width is to be contracted. The minimum width to which the channel can be contracted without affecting the upstream flow condition is

A partially open sluice gate is suddenly raised to its full opening. The resulting surge waves at the gate are

A hydraulic jump is formed in a 2.5 m wide rectangular channel which is horizontal and frictionless. The post jump depth and velocity are 0.7 m and 0.9 m/s respectively. The pre-jump velocity is _____________ m/s (g = 10 m/s²)

A wide channel is 2 m deep and has a velocity of flow 2.86 m/s. If a disturbance is caused, an elementary wave can travel upstream with a velocity of __________ in m/s.

A 2 m wide rectangular channel flowing at its normal depth of 1.2 m carries a discharge of 6.0 m3/s. If at a section, the depth of flow is y then match List-I (value of y) with List-II (type of water surface profile) and select the correct answer using the codes given below the lists. (take g = 9.8)

List-I List-II

(a) 0.63 m 1. M₁

(b) 0.90 m 2. M₂

(c) 1.1 m 3. M₃

(d) 1.42 m 4. S₂

5. S₃

Code: a b c d

A rectangular channel has 5 m width and 3 m water depth. If the bed slope of the channel is 1 in 1200, find the minimum width of throat in m, if Manning’s n = 0.02. (Report your answer upto two decimal place)

What is the maximum height of the hump (in m) to produce critical depth, without changing the water level at the entrance. (Report your answer upto two decimal place)

Water flows in a triangular channel of side slope 1 horizontal : 1 vertical and longitudinal slope of 0.001. Determine the type of channel slope when a discharge of 0.2 m³ /s flows through it. Assume Manning’s n = 0.015.