Related Mcqs:

1. Prandtl mixing length is___________________?

   A. Applicable to laminar flow problems
   B. A universal constant
   C. Zero at the pipe wall
   D. None of these

2. For turbulent fluid flow in pipe, the expression for Prandtl one seventh power law is (where, r = pipe radius, x = distance) ?

   A. V/Vmax = (x/r)1/7
   B. V/Vmax = (r/x)1/7
   C. V/Vmax = (x.r)1/7
   D. None of these

3. Prandtl number is a measure of the__________________?

   A. Heat conduction to viscosity of a fluid
   B. Cp/Cv of a fluid
   C. Elastic force to pressure force in the fluid flow
   D. Inertial force to elastic force in the fluid flow

4. The Prandtl Pitot tube measures the__________________?

   A. Velocity at a point in the flow
   B. Pressure at a point
   C. Average flow velocity
   D. Pressure difference in pipe flow

5. Power required for mixing Newtonian fluids is a function of the _________________?

   A. Speed of impeller, diameter of impeller & viscosity
   B. Density & viscosity of fluid only
   C. Density of fluid, viscosity of fluid & impeller dia only
   D. None of these

6. Baffles in mixing tanks are provided to__________________?

   A. Reduce swirling and vortex formation
   B. Increase the structural strength of the tank
   C. Aid in rotational flow
   D. None of these

7. The length of the tube necessary for the boundary layer to reach the centre of the tube and for fully developed flow to be established is called the _____________ length?

   A. Equivalent
   B. Transition
   C. Prandtl mixing
   D. None of these

8. What is the shear rate at the pipe wall, in case of laminar flow of Newtonian fluids in a pipe of diameter ‘D’ & length ‘L’ incurring a pressure drop ‘Δp’ with average velocity ‘Vavg’ ?

   A. D Δp/8L
   B. D Δp/4L
   C. 8 Vavg/D
   D. 4 Vavg/D

9. Equivalent length of a pipe fitting is____________________?

   A. Dependent on Reynolds number
   B. Independent of Reynolds number
   C. Dependent on the length of the pipe
   D. None of these

10. Applying a pressure drop across a capillary results in a volumetric flow rate ‘Q’ under laminar flow conditions. The flow rate for the same pressure drop, in a capillary of the same length but half the radius is____________________?

    A. Q/2
    B. Q/4
    C. Q/8
    D. Q/16