Fluid Mechanics and Hydraulic Machinery Miscellaneous


Fluid Mechanics and Hydraulic Machinery Miscellaneous

Fluid Mechanics and Hydraulic Machinery

  1. The SI unit of kinematic viscosity v is









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    Kinematic Viscosity:

    v =
    Dynamic viscosity
    =
    μ
    Densityρ

    v =
    μ
    =
    Ns / m²
    ρkg / m3

    =
    kg.m
    ×
    s
    ×
    1

    kg / m3

    = m²/s

    Correct Option: A

    Kinematic Viscosity:

    v =
    Dynamic viscosity
    =
    μ
    Densityρ

    v =
    μ
    =
    Ns / m²
    ρkg / m3

    =
    kg.m
    ×
    s
    ×
    1

    kg / m3

    = m²/s


  1. Match List-I with List-II and select the correct answer using the codes given below the lists:
    List-I
    P. Centrifugal compressor
    Q. Centrifugal pump
    R. Pelton wheel
    S. Kaplan turbine
    List-II
    1. Axial flow
    2. Surging
    3. Priming
    4. Pure impulse enter codes:









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    Kaplan – Axial flow Pelton – Impulse type

    Correct Option: A

    Kaplan – Axial flow Pelton – Impulse type


  1. A phenomenon is modeled using-n dimensional variables with k primary dimensions. The number of non-dimensional variables is









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    NA

    Correct Option: C

    NA


  1. The parameters which determines the friction factor for turbulent flow in a rough pipe are









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    NA

    Correct Option: C

    NA


  1. A test is conducted on a one-fifth scale model of a Francis turbine under a head of 2 m and volumetric flow rate of 1 m3/s at 450 rpm. Take the water density and the acceleration due to gravity as 103 kg/m3 and 10 m/s2, respectively. Assume no losses both in model and prototype turbines. The power (in MW) of a full sized turbine while working under a head of 30 m is _______ (correct to two decimal places).









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    Dm
    =
    1
    Dp5

    Model: H = 2 m, Q = 1 m3 /s
    Prototype: H = 30 m, P =?
    N = 450 rpm, ρ = 1000 kg/m3 /g = 10 m/s2
    For model, pm = ρgQH = 1000 × 10 × 1 × 2 = 20 kW

    = 29045.24 kW
    = 29.05 mW

    Correct Option: C

    Dm
    =
    1
    Dp5

    Model: H = 2 m, Q = 1 m3 /s
    Prototype: H = 30 m, P =?
    N = 450 rpm, ρ = 1000 kg/m3 /g = 10 m/s2
    For model, pm = ρgQH = 1000 × 10 × 1 × 2 = 20 kW

    = 29045.24 kW
    = 29.05 mW