Hydraulic Engineering BEU question paper solution 2021

Hydraulic Engineering BEU question paper solution 2021:- BEU civil engineering question paper solution . Here we are going to provide Bihar engineering Hydraulic engineering previous year question solution 2021.

  1. Choose the correct answer (any seven): 2×7=14
    (a) For hydrodynamically rough boundary, the friction coefficient
    (i) is constant
    (ii) varies inversely with Reynolds number
    (iii) is function of Reynolds number and relative roughness
    (iv) is dependent on relative roughness only

(b) Boundary layer separation is caused by
(i) release of bubbles from the fluid when the pressure goes below the vapour pressure
(ii) an adverse pressure gradient
(iii) reduction of pressure gradient to zero
(iv) the boundary layer thickness reducing to zero value


(c) Conveyance of a channel section is directly proportional to
(i) discharge
(ii)area of cross-section
(iii) bed-slope
(iv) Manning’s coefficient


(d) Reynolds number may be defined as the ratio of
(i) viscous forces to inertial forces
(ii) elastic forces to pressure forces
(iii) inertial forces to viscous forces
(iv) gravity forces to inertial forces

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(b) Boundary layer separation is caused by
(i) release of bubbles from the fluid when the pressure goes below the vapour pressure
(ii) an adverse pressure gradient
(iii) reduction of pressure gradient to zero
(iv) the boundary layer thickness reducing to zero value


(c) Conveyance of a channel section is directly proportional to
(i) discharge
area of cross-section
(ii) bed-slope
(iv) Manning’s coefficient


(d) Reynolds number may be defined as the ratio of
(i) viscous forces to inertial forces
(ii) elastic forces to pressure forces
inertial forces to viscous forces
(iv) gravity forces to inertial forces

(e) Hydraulic jump is expected when slope of a channel
(i) changes from mild to steep
(ii) changes from steep to steeper
(iii) changes from steep to mild
(iv) changes from mild to milder


(f)Which of the following pairs is not correctly matched?
(i) Stability of floating Metacentre body
(ii) Flownet : Streamline
(iii) Manning’s equation Channel flow
(iu) Froude number Viscosity


(g) The nominal distance of a boundary layer is defined as the distance from the wall to a point
(i) where the velocity is 99% less than the asymptotic limit
(ii) where the velocity ceases to be laminar
(iii) where the velocity is within 90% of the asymptotic limit
(iv) where the velocity is 99% of its asymptotic limit

(h) A rectangular channel has its width reduced from 60m to 40 mata transition. If the depth of flow upstream of the contraction is 1.2 m, the change in the bottom elevation at the transition required to cause zero change in the water surface elevation is
(i) 0-60 m drop
(ü) 0-60 m rise
(iii) 0-30 m drop
(iv) 0-30 m rise


(i) In a hydraulically efficient circular channel, the ratio of the hydraulic radius to the diameter of the channel is
(i) 1-0
(ⅱ) 0-5
(ⅲ) 0.25
(ίν) 0-125


(j) Bernoulli equation between any two points is applicable
(i) in any rotational flow of an incompressible fluid
(ii) in any type of irrotational flow of a fluid
(iii) in steady rotational flow of an incompressible fluid
(iv) in steady irrotational flow of an incompressible fluid

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2. Explain the characteristics of laminar and turbulent boundary layers.


(b) A smooth flat plate 1.5 m wide and 2 m long is subjected to flow of water along its length at a uniform velocity of 2 m/s. Find (i) the extent of the laminar boundary layer on the plate, (ii) the thickness of the boundary layer at the edge of the laminar boundary layer and at the trailing edge and (iii) the shear stress at the trailing edge, (ρ = 998 kg/m³, v= 1×10-6 m²/s).

3. (a) Explain the significance of channels of most efficient section.


(b) A most efficient trapezoidal section is required to give a maximum discharge of 21-5 m³/s of water. The slope of the channel bottom is 1 in 2500. Taking C=70 m/s in Chezy’s equation, determine the dimensions of the channel. Also determine the value of Manning’s n, taking the value of velocity of flow as obtained for the channel by Chezy’s equation.

6. (a) What are the three stages of a CFD software?
(b) Write down the governing equations of fluid flow, stating the assumptions in deriving the equation and then explain the significance of each term.

7. (a) What are the different energies of a fluid? Explain each of them.
(b) A 0.25 m diameter pipe carries oil of specific gravity 0-8 at the rate of 120 liters per second and the pressure at a point A is 19.62 kN/m² (gage). If the point A is 3-5 m above the datum line, calculate the total energy at point A in meters of oil.

8. (a) What do you understand by (i) steady and unsteady flow; (ii) uniform and non-uniform flow in the case of channels?
(b) A rectangular channel which is laid on a bottom slope of 0.0064 is to carry 20 m³/s of water. Determine the width of the channel when the flow is in critical condition. Take Manning’s n=0.015.

9. A hydraulic jump occurs in a 90° triangular channel. Derive an equation relating the two depths and the flow rate. If the depths before and after the jump in the above channel are 0-5 m and 1.0 m, determine the flow rate and obtain the Froude numbers before and after the jump.

BEU Hydraulic Engg. solution 2021 ==>> Download

BEU Hydraulic Engg question paper 2021 ==>> Download

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