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Mechanical Engineering :: Hydraulics and Fluid Mechanics in ME

Hydraulics and Fluid Mechanics in ME - section-1
  1. A piece of wood having weight 5 kg floats in water with 60% of its volume under the liquid. The specific gravity of wood is

    2. A.

     0.83
    B.

     0.6
    C.

     0.4
    D.

     0.3

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  2. An impulse turbine is used for

    3. A.

     Low head of water
    B.

     High head of water
    C.

     Medium head of water
    D.

     High discharge

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  3. The power developed by a turbine is (where H = Head of water under which the turbine is working)

    4. A.

     Directly proportional to H1/2
    B.

     Inversely proportional to H1/2
    C.

     Directly proportional to H3/2
    D.

     Inversely proportional to H3/2

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  4. The flow ratio in case of Francis turbine varies from

    5. A.

     0.15 to 0.3
    B.

     0.4 to 0.5
    C.

     0.6 to 0.9
    D.

     1 to 1.5

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  5. The speed ratio in case of Francis turbine varies from

    6. A.

     0.15 to 0.3
    B.

     0.4 to 0.5
    C.

     0.6 to 0.9
    D.

     1 to 1.5

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  6. According to fan laws, at constant speed and capacity, the pressure and power vary

    7. A.

     Directly as the air or gas density
    B.

     Inversely as square root of density
    C.

     Inversely as density
    D.

     As square of density

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  7. The height of a water column equivalent to a pressure of 0.15 MPa is

    8. A.

     15.3 m
    B.

     25.3 m
    C.

     35.3 m
    D.

     45.3 m

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  8. In an immersed body, centre of pressure is

    9. A.

     At the centre of gravity
    B.

     Above the centre of gravity
    C.

     Below be centre of gravity
    D.

     Could be above or below e.g. depending on density of body and liquid

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  9. The undershot water wheels are those in which

    10. A.

     The wheel runs entirely by the weight of water
    B.

     The wheel runs entirely by the impulse of water
    C.

     The wheel runs partly by the weight of water and partly by the impulse of water
    D.

     None of the above

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  10. Multistage centrifugal pumps are used to obtain

    11. A.

     High discharge
    B.

     High head
    C.

     Pumping of viscous fluids
    D.

     High head and high discharge

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