The most economical channel section for the fluid flow is the one for which the discharge is maximum for a given cross-sectional area. Vertical velocity distribution in an open channel for laminar flow can be assumed to be_______________?

Related Mcqs:

1. The pressure drop per unit length for laminar flow of fluid through a long pipe is proportional to (where, A = cross-sectional area of the pipe & D = Diameter of the pipe) ?

   A. A
   B. D
   C. 1/A
   D. 1/A2

2. Transition from laminar flow to turbulent flow in fluid flow through a pipe does not depend upon the___________________?

   A. Length of the pipe
   B. Diameter of the pipe
   C. Density of the fluid
   D. Velocity of the fluid

3. _______________ number determines whether the fluid flow in an open channel is super-critical, critical or sub-critical ?

   A. Mach
   B. Reynolds
   C. Froude
   D. Weber

4. Nusselt number is related to Grashoff number (Gr) in turbulent & laminar flow respectively, in respect of free convection over a vertical flat plate as_________________?

   A. Gr0.25, Gr
   B. Gr0.25, Gr0.33
   C. Gr, Gr0.25
   D. Gr0.33, Gr0.25

5. A fluid is termed as the Newtonian fluid, when the shear stress is _________________ the velocity gradient ?

   A. Independent of
   B. Inversely proportional to
   C. Directly proportional to
   D. None of these

6. Reynolds number of a fluid flowing in a circular pipe is 10,000. What will be the Reynolds number when the fluid velocity is decreased by 30% & the pipe diameter is increased by 30% ?

   A. 9,100
   B. 13,000
   C. 7,000
   D. 2,550

7. In a counter flow heat exchanger, hot fluid enters at 170°C & leaves at 150°C, while the cold fluid enters at 50°C & leaves at 70°C. The arithmetic mean temperature difference in this case is ______________ °C?

   A. 20
   B. 60
   C. 120
   D. ∞

8. An approximately _____________ process exemplifies the flow of a gas through a very long pipe of uniform cross-section ?

   A. Adiabatic
   B. Isothermal
   C. Isentropic
   D. Isochoric

9. Nusselt number is related to the Reynolds number (Re) in turbulent & laminar flow respectively as______________________?

   A. Re0.5, Re0.8
   B. Re0.8, Re-0.5
   C. Re0.8, Re0.5
   D. Re-0.8, Re0.5

10. The laminar boundary layer thickness in zero pressure gradient flow over a flat plate along the x-direction varies as x0.5 while the thickness of turbulent boundary layer varies as (where, x = distance from the leading edge) ?

    A. x1.5
    B. x0.8
    C. x-1.5
    D. x-0.8