logo

CuriousTab

CuriousTab

Discussion


Home Mechanical Engineering Hydraulics and Fluid Mechanics Comments

  • Question
  • The velocity at which the flow changes from laminar flow to turbulent flow is called


  • Options
  • A. critical velocity
  • B. velocity of approach
  • C. sub-sonic velocity
  • D. super-sonic velocity

  • Correct Answer
  • critical velocity 


  • Hydraulics and Fluid Mechanics problems


    Search Results


    • 1. The pressure measured with the help of a pressure gauge is called

    • Options
    • A. atmospheric pressure
    • B. gauge pressure
    • C. absolute pressure
    • D. mean pressure
    • Discuss
    • 2. A venturiflume is used to measure

    • Options
    • A. pressure of liquid
    • B. discharge of liquid
    • C. pressure difference between two points in a channel
    • D. pressure difference between two points in a pipe
    • Discuss
    • 3. The flow in a pipe or channel is said to be non-uniform when

    • Options
    • A. the liquid particles at all sections have the same velocities
    • B. the liquid particles at different sections have different velocities
    • C. the quantity of liquid flowing per second is constant
    • D. each liquid particle has a definite path
    • Discuss
    • 4. The total pressure on an immersed surface inclined at an angle ? with the liquid surface is

    • Options
    • A. wA
    • B. wx
    • C. wAx
    • D. wAx/sin ?
    • Discuss
    • 5. The power absorbed (in watts) in overcoming the viscous resistance of a footstep bearing is

    • Options
    • A.
    • B.
    • C.
    • D.
    • Discuss
    • 6. A flow is called hyper-sonic, if the Mach number is

    • Options
    • A. less than unity
    • B. unity
    • C. between 1 and 6
    • D. none of these
    • Discuss
    • 7. Reynold's number is the ratio of the inertia force to the

    • Options
    • A. surface tension force
    • B. viscous force
    • C. gravity force
    • D. elastic force
    • Discuss
    • 8. A jet of water discharging from a 40 mm diameter orifice has a diameter of 32 mm at its vena contracta. The coefficient of contraction is

    • Options
    • A. 0.46
    • B. 0.64
    • C. 0.78
    • D. 0.87
    • Discuss
    • 9. The pressure intensity in kN/m2 (or kPa) at any point in a liquid is (where w = Specific weight of liquid, and h = Depth of liquid from the surface)

    • Options
    • A. w
    • B. wh
    • C. w/h
    • D. h/w
    • Discuss
    • 10. The discharge over a rectangular notch is

    • Options
    • A. inversely proportional to H3/2
    • B. directly proportional to H3/2
    • C. inversely proportional to H5/2
    • D. directly proportional to H5/2
    • Discuss


    Comments

    There are no comments.

Enter a new Comment