Basic Hydraulics
Manning Equation
Bernoulli Theorem
Open-channel Flow
Solved Example: 9085-01
A rectangular channel of bed width 2 m is to be laid at a bed slope of 1 in 1000. Find the hydraulic radius of the canal cross-section for the maximum discharge condition? Take Chezy's constant as 50: (SSC JE CE Mar 2021 Evening)
A. 0.5 m
B. 2 m
C. 1 m
D. 0.25 m
Correct Answer: A
Solved Example: 9085-02
For obtaining the most economical trapezoidal channel section with depth of flow = 3 m, what is the hydraulic mean radius? (SSC JE CE Oct 2020 Morning)
A. 1.5 m
B. 3.0 m
C. 2.0 m
D. 1.0 m
Correct Answer: A
Solved Example: 9085-03
The discharge over a rectangular notch is: (BPSC AE Civil 2012)
A. Inversely proportional to H$^{3/2}$
B. Directly proportional to H$^{3/2}$
C. Inversely proportional to H$^{5/2}$
D. Directly proportional to H$^{5/2}$
Correct Answer: B
Solved Example: 9085-04
For a hydraulically efficient rectangular channel of bed width 5 m, the hydraulic radius is equal to: (KPSC AE 2017)
A. 1.25 m
B. 2 m
C. 2.25 m
D. 1.75 m
Correct Answer: A
Solved Example: 9085-05
The depth of water below the spillway and after hydraulic jump are 1 m and 6 m respectively. The head loss will be: (SSC JE CE Mar 2017 Evening)
A. 1.04 m
B. 5 m
C. 1.7 m
D. 2.05 m
Correct Answer: B
Solved Example: 9085-06
Specific energy of flowing water through a rectangular channel of width 5 m when discharge is 10 m$^3$/ s and depth of water is 2 m is: (SSC JE CE Oct 2020 Evening)
A. 1.06 m
B. 1.02 m
C. 2.05 m
D. 2.60 m
Correct Answer: C
Solved Example: 9085-07
In an open channel flow, for best efficiency of a rectangular section channel, ratio of bottom width to depth shall be: (SSC JE CE Oct 2020 Morning)
A. 1
B. $\dfrac{1}{2}$
C. $\dfrac{1}{4}$
D. 2
Correct Answer: D
Solved Example: 9085-08
The horizontal to vertical side slope in case of Cipoletti weir is: (NPCIL SA/ST ME GJ Nov 2019, Shift I)
A. 1 : 1
B. 1 : 3
C. 1 : 2
D. 1 : 4
Correct Answer: D
Solved Example: 9085-09
The Froude number of a hydraulic jump is 5.5. The jump can be classified as a/an: (MPPSC AE CE 2016 Paper II)
A. Undular jump
B. Oscillating jump
C. Weak jump
D. Steady jump
Correct Answer: D
Solved Example: 9085-10
If the depth of water in an open channel is less than the critical depth, the flow is called: (AFCAT EKT Mech Paper 4 Set I 2014)
A. Critical flow
B. Turbulent flow
C. Tranquil flow
D. Torrential flow
Correct Answer: D
Solved Example: 9085-11
The critical depth equation for a triangular channel is: (TSPSC AEE Civil Paper II 2018)
A. $\dfrac{v}{\sqrt{g}y}$
B. $\left[{\dfrac{2Q^2}{gZ^2}}\right]^{\frac{1}{5}}$
C. $\left[{\dfrac{q^2}{g}}\right]^{\frac{1}{3}}$
D. $\left[{\dfrac{3Q^3}{gZ^2}}\right]^{\frac{1}{3}}$
Correct Answer: B