Fluid Mechanics and Hydraulic Machinery Miscellaneous


Fluid Mechanics and Hydraulic Machinery Miscellaneous

Fluid Mechanics and Hydraulic Machinery

  1. For a Newtonian fluid









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    For a Newtonian fluid, shear stress is proportional to rate of shear strain.

    Correct Option: C

    For a Newtonian fluid, shear stress is proportional to rate of shear strain.


  1. Kaplan water turbine is commonly used when the flow through its runner is









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    Kaplan turbine is an axial flow turbine and works at low heads (<50).

    Correct Option: B

    Kaplan turbine is an axial flow turbine and works at low heads (<50).


  1. In order to have maximum power from a Pelton turbine, the bucket speed must be









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    For a pelton wheel, maximum power is obtained at,

    u =
    υ
    2

    Correct Option: B

    For a pelton wheel, maximum power is obtained at,

    u =
    υ
    2


  1. The velocity triangles at the inlet and exit of the rotor of a turbo machine are shown. V denotes the absolute velocity of the fluid, W denotes the relative velocity of the fluid and U denotes the blade velocity. Subscripts 1 and 2 refer to inlet and outlet respectively If V2 = W1 and V1 = W2, then the degree of reaction is









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    DOR =
    W2² −W1²
    2/W2² −W1²

    =
    1
    = 0.5
    2

    Correct Option: C

    DOR =
    W2² −W1²
    2/W2² −W1²

    =
    1
    = 0.5
    2


  1. A hydraulic turbine develops 1000 kW power for a head of 40 m. If the head is reduced to 20 m, the power developed (in kW) is









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    Pu =
    P
    H3/2

    ∴ 
    P1
    =
    P2
    H13/2H23/2

    ⇒  P2 = 353.55 kW.

    Correct Option: B

    Pu =
    P
    H3/2

    ∴ 
    P1
    =
    P2
    H13/2H23/2

    ⇒  P2 = 353.55 kW.