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Civil Engineering :: Hydraulics and Fluid Mechanics - Civil Engineering

  1. Cavitation is caused by

  2. A.

     high velocity

    B.

     high pressure

    C.

     weak material

    D.

     low pressure

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  3. For laminar flow in circular pipes, the Darcy’s friction factor f is equal to

  4. A.

     16/Re

    B.

     32/ Re

    C.

     64/ Re

    D.

     none of the above where Re is Reynolds number.

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  5. Property of a fluid by which its own molecules are attracted is called

  6. A.

     adhesion

    B.

     cohesion

    C.

     viscosity

    D.

     compressibility

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  7. The property of a fluid which enables it to resist tensile stress is known as

  8. A.

     compressibility

    B.

     surface tension

    C.

     cohesion

    D.

     adhesion

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  9. The eddy viscosity for turbulent flow is

  10. A.

     a function of temperature only

    B.

     a physical property of the fluid.

    C.

     dependent on the flow

    D.

     independent of the flow

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  11. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is

  12. A.

     constant

    B.

     dependent only on Reynolds number

    C.

     a function of Reynolds number and relative roughness

    D.

     dependent on relative roughness only

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  13. Two pipe systems can be said to be equivalent, when the following quantites are same

  14. A.

     friction loss and flow

    B.

     length and diameter

    C.

     flow and length

    D.

     friction factor and diameter

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  15. For similarity, in addition to models being geometrically similar to prototype, the following in both cases should also be equal

  16. A.

     ratio of inertial force to force due to viscosity

    B.

     ratio of inertial force to force due to gravitation

    C.

     ratio of inertial force to force due to surface tension

    D.

     all the four ratios of inertial force to force due to viscosity, gravitation, surface tension, and elasticity

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  17. A hydraulic press has a ram of 15 cm diameter and plunger of 1.5 cm. It is required to lift a weight of 1 tonne. The force required on plunger is equal tc

  18. A.

     10 kg

    B.

     100 kg

    C.

     1000 kg

    D.

     1 kg

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  19. Specific weight of water in S.I. units is equal to

  20. A.

     1000 N/m3

    B.

     10000 N/m3

    C.

     9.81 xlO3 N/m3

    D.

     9.81 xlO6 N/m3

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