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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. In a short cylindrical external mouthpiece, the vena contracta occurs at a distance __________ the diameter of the orifice from the outlet of orifice.

  2. A.

    equal to

    B.

    one-fourth

    C.

    one-third

    D.

    one-half

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  3. Viscous force is the __________ of shear stress due to viscosity and cross-sectionar area of flow.

  4. A.

    sum

    B.

    different

    C.

    product

    D.

    ratio

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  5. The density of air is same at different heights.

  6. A.

    Correct.

    B.

    Incorrect

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  7. The total pressure on a horizontally immersed surface is (where w = Specific weight of the liquid, A = Area of the immersed surface, and x = Depth of the centre of gravity of the immersed surface from the liquid surface)

  8. A.

    w.A

    B.

    wx

    C.

    wAx

    D.

    wA/x

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  9. A body floating in a liquid is said to be in a stable equilibrium, if its metacentre coincides with its centre of gravity.

  10. A.

    True

    B.

    False

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