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

Related Mcqs:

1. 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_______________?

   A. Parabolic
   B. Hyperbolic
   C. Straight line
   D. None of these

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. 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. ∞

4. _______________ test determines the yield strength, Young’s modulus of elasticity, percentage reduction in area & percentage elongation of a material ?

   A. Tensile
   B. Fatigue
   C. Impact
   D. None of these

5. Gage pressure within a spherical droplet of a fluid is ‘p’. What will be gage pressure within a bubble of the same size & of the same fluid ?

   A. p
   B. 2 p
   C. 0.5 p
   D. 0.25 p

6. 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

7. 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

8. As the fluid flow rate increases, the float of the Rotameter____________________?

   A. Rises in the tube
   B. Rotates at higher speed
   C. Rotates at lower speed
   D. Drops down in the tube

9. Friction factor for fluid flow in pipe does not depend upon the________________?

   A. Pipe length
   B. Pipe roughness
   C. Fluid density & viscosity
   D. Mass flow rate of fluid

10. 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