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Mechanical Engineering :: Hydraulics and Fluid Mechanics

  1. Power required to drive a centrifugal pump is directly proportional to _________ of its impeller.

  2. A.

     Diameter

    B.

     Square of diameter

    C.

     Cube of diameter

    D.

     Fourth power of diameter


  3. Which of the following is an example of laminar flow?

  4. A.

     Underground flow

    B.

     Flow past tiny bodies

    C.

     Flow of oil in measuring instruments

    D.

     All of these


  5. According to Newton's law of viscosity, the shear stress on a layer of a fluid is __________ to the rate of shear strain.

  6. A.

     Equal to

    B.

     Directly proportional

    C.

     Inversely proportional

    D.

     None of these


  7. When a liquid is flowing through a pipe, the velocity of the liquid is

  8. A.

     Maximum at the centre and minimum near the walls

    B.

     Minimum at the centre and maximum near the walls

    C.

     Zero at the centre and maximum near the walls

    D.

     Maximum at the centre and zero near the walls


  9. The torque required to overcome viscous resistance of a footstep bearing is (where μ = Viscosity of the oil, N = Speed of the shaft, R = Radius of the shaft, and t = Thickness of the oil film)

  10. A.

     μπ²NR/60t

    B.

     μπ²NR²/60t

    C.

     μπ²NR³/60t

    D.

     μπ²NR⁴/60t


  11. A glass tube of smaller diameter is used while performing an experiment for the capillary rise of water because

  12. A.

     It is easier to see through the glass tube

    B.

     Glass tube is cheaper than a metallic tube

    C.

     It is not possible to conduct this experiment with any other tube

    D.

     All of the above


  13. The angle of taper on draft tube is

  14. A.

     Greater than 15°

    B.

     Greater than 8°

    C.

     Greater than 5°

    D.

     Less than 8°


  15. The working of which of the following hydraulic units is based on Pascal's law?

  16. A.

     Air lift pump

    B.

     Jet pump

    C.

     Hydraulic coupling

    D.

     Hydraulic press


  17. When a body floating in a liquid, is displaced slightly, it oscillates about

  18. A.

     C.G. of body

    B.

     Center of pressure

    C.

     Center of buoyancy

    D.

     Metacentre


  19. A flow in which each liquid particle has a definite path, and the paths of individual particles do not cross each other, is called

  20. A.

     Steady flow

    B.

     Uniform flow

    C.

     Streamline flow

    D.

     Turbulent flow