Fluid Mechanics and Hydraulic Machinery Miscellaneous


Fluid Mechanics and Hydraulic Machinery Miscellaneous

Fluid Mechanics and Hydraulic Machinery

  1. Circulation is defined as line integral of tangential component of velocity about a _______ (fill in the blanks)









  1. View Hint View Answer Discuss in Forum

    In a flow field, closed contour exists.

    Correct Option: C

    In a flow field, closed contour exists.


  1. Shown below are three pipe sections through which water flows as shown. Option a to d below pertain to the direction of the net force on the pipe section due to the flow of water.
    45° to both +ve x and +ve y axes
    45° to both -ve x and +ve y axes
    45° to both +ve x and -ve y axes
    45° to both -ve x and -ve y axes
    State which of the options indicate the correct direction of force for pipe 1, pipe 2 and pipe 3










  1. View Hint View Answer Discuss in Forum

    1 – d, 2 – d, 3 – b

    Correct Option: A

    1 – d, 2 – d, 3 – b


  1. The stream function in a two dimensional flow field is given by ψ = x² – y² The magnitude of the velocity at point (1, 1) is









  1. View Hint View Answer Discuss in Forum

    Stream function, ψ = x² – y²

    u =
    -∂ψ
    =
    -∂
    (x2 - y2) = 2y
    ∂y∂y

    or V =
    -∂ψ
    =
    (x2 - y2) = 2x
    ∂x∂x

    V = uî + vĵ at (1, 1) = 2î + 2ĵ
    V = √(2)² + (2)² = 2√2

    Correct Option: B

    Stream function, ψ = x² – y²

    u =
    -∂ψ
    =
    -∂
    (x2 - y2) = 2y
    ∂y∂y

    or V =
    -∂ψ
    =
    (x2 - y2) = 2x
    ∂x∂x

    V = uî + vĵ at (1, 1) = 2î + 2ĵ
    V = √(2)² + (2)² = 2√2


  1. In given figure, if the pressure of gas in bulb A is 50 cm Hg vacuum and patm = 76 cm Hg, then height of column H is equal to










  1. View Hint View Answer Discuss in Forum


    pA = 50 cm Hg vacuum = pH

    Correct Option: B


    pA = 50 cm Hg vacuum = pH


  1. Refer to figure, the absolute pressure of gas A in the bulb is










  1. View Hint View Answer Discuss in Forum

    Patm = 760 mm Hg

    Let PA be the absolute pressure at 'A'
    Pressure at D = Pressure at E
    or PA + PCD = Patm + PAF + PFE

    PA +
    170
    = 760 +
    50
    + 20
    13.613.6

    PA = 771.2 mm Hg

    Correct Option: A

    Patm = 760 mm Hg

    Let PA be the absolute pressure at 'A'
    Pressure at D = Pressure at E
    or PA + PCD = Patm + PAF + PFE

    PA +
    170
    = 760 +
    50
    + 20
    13.613.6

    PA = 771.2 mm Hg