Fluid Mechanics And Hydraulics

6 Questions | Total Attempts: 323

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Fluid Mechanics And Hydraulics

Civil Engineering


Questions and Answers
  • 1. 
    The displacement thickness of a boundary layer is
    • A. 

      The distance to the point where (v/V) = 0.99

    • B. 

      The distance where the velocity 'v' is equal to the shear velocity V*, that is, where v=V*

    • C. 

      The distance by which the main flow is to be shifted from the boundary to maintain the continuity equation

    • D. 

      One half the actual thickness of the boundary layer

  • 2. 
    The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is
    • A. 

      D>m>e

    • B. 

      D>e>m

    • C. 

      E>m>d

    • D. 

      E>d>m

  • 3. 
    Drag force is a function of
    • A. 

      Projected area of the body

    • B. 

      Mass density of the fluid

    • C. 

      Velocity of the body

    • D. 

      The correct answer is A, B and C

  • 4. 
    Apart form inertia force, which of the following forces is most important in motion of submarines under water?
    • A. 

      Viscous force

    • B. 

      Gravity force

    • C. 

      Compressive force

    • D. 

      Surface tension force

  • 5. 
    A spillway model constructed to a scale of 1:4 gives a discharge of 5 m3/s.   The discharge from the prototype would be  
    • A. 

      160 m3/s

    • B. 

      640 m3/s

    • C. 

      10 m3/s

    • D. 

      20 m3/s

  • 6. 
    A river model is made to a length scale ratio of 1/100 and depth scale ratio of 1/16.  A peak discharge of 25,600 m3/s in the river will be simulated in the model with a discharge of
    • A. 

      10 cumec.

    • B. 

      4 cumec.

    • C. 

      1.6 cumec.

    • D. 

      0.64 cumec.