The distance y from pipe boundary, at which the point velocity is equal to average velocity for turbulent flow, is________________?

Related Mcqs:

1. The boundary layer thickness at a distance of l m from the leading edge of a flat plate, kept at zero angle of incidence to the flow direction, is O.l cm. The velocity outside the boundary layer is 25 ml sec. The boundary layer thickness at a distance of 4 m is__________________?

   A. 0.40 cm B. 0.20 cm C. 0.10 cm D. 0.05 cm Assume that boundary layer is entirely laminar...

2. The distance from pipe boundary, at which the turbulent shear stress is one-third die wall shear stress, is_______________?

   A. 1/3 R B. 1/2 R C. 2/3 R D. 3/4R where R is the radius of pipe...

3. The depth ‘d’ below the free surface at which the point velocity is equal to the average velocity of flow for a uniform laminar flow with a free surface, will be_________________?

   A. 0.423 D B. 0.577 D C. 0.223 D D. 0.707 D where D is the depth of flow...

4. The boundary layer thickness in turbulent flow varies as______________?

   A. x”7 B. x,/2 C. x4/5 D. x3/5 where x is the distance from leading edge...

5. For hydro-dynamically smooth boundary, the friction coefficient for turbulent flow is_______________?

   A. constant B. dependent only on Reynolds number C. a function of Reynolds number and relative roughness D. dependent on relative roughness only...

6. In a two dimensional incompressible steady flow around an airfoil, the stream lines are 2 cm apart at a great distance from the airfoil, where the velocity is 30 m/sec. The velocity near the airfoil, where the stream lines are 1.5 cm apart, is_________________?

   A. 22.5 m/sec B. 33 m/sec C. 40 m/sec D. 90 m/sec...

7. The ratio of average velocity to maximum velocity for steady laminar flow in circular pipes is_______________?

   A. 1/2 B. 2/3 C. 3/2 D. 2...

8. If x is the distance from leading edge, then the boundary layer thickness in laminar flow varies as________________?

   A. x B. x C. x D. x/7...

9. A fluid of kinematic viscosity 0.4 cm2/sec flows through a 8 cm diameter pipe. The maximum velocity for laminar flow will be__________________?

   A. less than 1 m/sec B. 1 m/sec C. 1.5 m/sec D. 2 m/sec...

10. Flow at constant rate through a tapering pipe is________________?

    1. steady flow 2. uniform flow 3. unsteady flow 4. non-uniform flow The correct answer is? A. (1) and (2) B. (1)and(iv) C. (2) and (3) D. (2) and (4)...