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Hydraulics Engineering MCQ | Part 1

In a wide rectangular channel if the normal depth is increased by 20 %, then what is the approximate increase in discharge? A. 25% B. 30% C. 35% D. 40

Hydraulics Engineering Multiple Choice Questions (MCQ) for GATE | Fluid Mechanics | Part 1 | By Akhand Dutta




Hydraulics Engineering Multiple Choice Questions (MCQ) | Fluid Mechanics | Part 1 | By Akhand Dutta




    In a wide rectangular channel if the normal depth is increased by 20 %, then what is the approximate increase in discharge?

    • A. 25%
    • B. 30%
    • C. 35%
    • D. 40%
     

    35%



    The maximum velocity in a channel section often occurs on the water surface.

    • A. Above
    • B. Below
    • C. Between
    • D. Top
     

    Below


    What is the Froude’s number for a channel havingmean velocity 4.34 m/s and mean hydraulic depth of 3m?

    • a) 0.4m
    • b) 0.6m
    • c) 0.7m
    • d) 0.8m
     

    0.8 m



    In a rectangular channel, the ratio of specific energy at critical depth EC to critical depth YC is

    • a) 2
    • b) 1
    • c) 1.5
    • d) 1.25
     

    Write the correct answer here



    If the value of the rate of change of specific energy is 7.79×10-4 m and Sf = 0.00013, calculate the value of bed slope.

    • a) 1 in 1000
    • b) 1 in 1100
    • c) 1 in 1200
    • d) 1 in 1300
     

    1 in 1100



    The velocity of flow through a channel is 0.74 m/s and the hydraulic radius of the channel is 1.11m, calculate the value of C if the bed slope of the channel is 1 in 5000.

    • a) 40
    • b) 45
    • c) 50
    • d) 55
     

    50



    A trapezoidal channel with a base of 6 m and side slope of 2 horizontal to 1vertical conveys water at 17 m3/s with a depth of 1.5 m. is the flow situation is

    • a) Subcritical
    • b) supercritical
    • c) both
    • d) None of these
     

    Subcritical



    The flow characteristics of a channel do not change with time at any point. What type of flow is it?

    • a) Steady flow
    • b) Uniform flow
    • c) Laminar flow
    • d) Turbulent flow
    •  

    Steady Flow



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

    • a) H2 and S2
    • b) H3 and S2
    • c) M2 and H2
    • d) M2 and H3
     

    M2 and H2



    Calculate the velocity of flow in a triangular channel having depth 7m and the side slope of the channel is 1H:4V if the bed slope of the channel is 1 in 1200 and the slope of the energy line is 0.00010.Given: dy/dx=7.55m.

    • a) 1 m/s
    • b) 2 m/s
    • c) 3 m/s
    • d) 4 m/s
     

    1 m/s



    M3 profile is indicated by which of the following conditions?

    • a) Yo > Yc > Y
    • b) Y > Yo > YC
    • c) Y > YC > Y0
    • d) YC > Y0 > Y
     

    Yo > Yc > Y



    Measures velocity at a point of the fluid in a stream is

    • a) Venturi meter
    • b) pH meter
    • c) Pitot-Static tubes
    • d) None of the mentioned
     

    Pitot-Static tubes



    A trapezoidal canal with side slopes 2: 1 has a bottom width of 4 m and carries a flow of 23 m3/s.the critical depth is

    • a) 1.5
    • b) 1.23
    • c) 2.35
    • d) 1.90
     

    1.23



    A hydraulically efficient trapezoidal section of open channel flow carries water at the optimal depth of 0.6 m. Chezy coefficient is 75 and bed slope is 1 in 250. What is the discharge through the channel

    • a) 1.44 m3/ s
    • b) 1.62 m3/ s
    • c) 15 m3/ s
    • d) 2.24 m3/ s
     

    1.62 m3/ s



    The Froude’s number for a flow in a channelsection is 1. What type of flow is it?

    • a) Sub Critical
    • b) Critical
    • c) Super critical
    • d) Tranquil
     

    Critical



    In open channels, maximum velocity occurs:

    • (a) near the channel bottom
    • (b) in the mid-depth of flow
    • (c) just below the free surface
    • (d) at the surface
     

    just below the free surface



    Calculate the aspect ratio having channel widthof 6m and depth of 8m.

    • a) 0.75m
    • b) 1.33m
    • c) 1.50m
    • d) 1.68m
     

    0.75m



    For a channel to be economic which of thefollowing parameters should be minimum

    • a) Wetted perimeter
    • b) Wetted area
    • c) Section factor
    • d) Hydraulic depth
     

    Wetted perimeter



    Calculate the discharge through a channel havinga bed slope 1 in 1000, area 12m2, hydraulic radius of 1.2m and Chezy’s constantbeing equal to 50.

    • a) 17.98 m3/s
    • b) 18.98 m3/s
    • c) 19.98 m3/s
    • d) 20.98 m3/s
     

    20.98 m3/s



    The term alternate depth in an open channel flow refers to the

    • a) Depths having the same specific energy for a given discharge
    • b) Depths before and after the passage of the surge
    • c) Depths having the same kinetic energy for a given discharge
    • d) Depths on either side of hydraulic jump.
    •  

    Depths having the same specific energy for a given discharge



    A hydraulically efficient rectangular channel of bed width 5m the hydraulic radius is equal to

    • a) 2.5 m
    • b) 5 m
    • c) 1.25 m
    • d) 2 m
     

    1.25 m



    Which is the cheapest device for measuring flow/ discharge rate.

    • a) Venturimeter
    • b) Pitot tube
    • c) Orificemeter
    • d) None of the mentioned
     

    Pitot tube



    For subcritical flow, the Froude number is

    • a) Not equal to one
    • b) Less than one
    • c) Greater than one
    • d) Equal to one
     

    Less than one



    Calculate the value of Sf for a trapezoidal channel having depth 2m, width 5m, and side slope of 1H:1.5V. Given: dy/dx=1.18×10-3,S0 = 1 in 1000, C = 50

    • a) 0.00001
    • b) 0.00002
    • c) 0.00003
    • d) 0.00004
     

    0.00001



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

    • a) 0.64 m
    • b) 0.54 m
    • c) 0.44 m
    • d) 0.34 m
     

    0.54 m



    A channel bed slope 0.0009 carries a discharge of 30 m3/ when the depth of flow is 1 .0 m What is the discharge carries by an exactly similar channel at the same depth of flow if the slope is decreased to 0.0001?

    • a) 10 m3/ s
    • b) 90 m3/ s
    • c) 15 m3/ s
    • d) 60 m3/ s
     

    10 m3/ s



    Calculate the Froude’s number for a channel having discharge of 261.03m3/s, cross-sectional area of 42m2 and the top width being 6m

    • a) 0.65
    • b) 0.72
    • c) 0.38
    • d) 0.75
     

    0.75



    Estimate the section factor for a channel section having cross-sectional area of 40m2 and hydraulic depth of 6 m.

    • a) 94.3
    • b) 95.6
    • c) 97.9
    • d) 100
     

    97.9



    The direct step method of computation for GVF is

    • a) applicable to non- prismatic channel
    • b) applicable to prismatic channel
    • c) both
    • d) None of these
     

    applicable to non- prismatic channel




    For a hydraulically efficient rectangular section the ratio of width tonormal depth is

    • a) 0.5
    • b) 1.0
    • c) 2.0
    • d) 3.5
     

    2.0



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    About the Author

    Mr Akhand Dutta is the Founder and Owner of Civil Engineering With Akhand Dutta (CEWA) and Akhand Dutta Writes. Currently, a civil engineering student at Bipin Tripathi Kumaon Institute of Technology, Dwarahat, Almora, Uttarakhand and has done his …

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