The maximum thickness of boundary layer in a pipe of radius r 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 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...

3. 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...

4. The correct relationship among displacement thickness d, momentum thickness m and energy thickness e is_________________?

   A. d > m > e B. d > e > m C. e > m > d D. e > d > m...

5. When time of closure tc = L/v0 (where L is length of pipe and v0 is speed of pressure wavE., the portion of pipe length subjected to maximum head is__________________?

   A. L/4 B. L/3 C. L/2 D. L...

6. 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...

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

   A. 0.223 R B. 0.423 R C. 0.577 R D. 0.707 R where R is radius of pipe...

8. The length of a pipe is 1 km and its diameter is 20 cm. If the diameter of an equivalent pipe is 40 cm, then its length is_____________________?

   A. 32 km B. 20 km C. 8 km D. 4 km...

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. The horse power transmitted through a pipe is maximum when the ratio of loss of head due to friction and total head supplied is________________?

    A. 1/3 B. 1/4 C. 1/2 D. 2/3...