The Prartdtl mixing length is_________________?

Related Mcqs:

1. 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

2. Two pipes of same length and diameters d and 2d respectively are connected in series. The diameter of an equivalent pipe of same length is________________?

   A. less than d
   B. between d and 1.5 d
   C. between 1.5 d and 2d
   D. greater than 2d

3. 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

4. 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

5. Coefficient of contraction for an external cylindrical mouthpiece is_________________?

   A. 1.00
   B. 0.855
   C. 0.7H
   D. 0.611

6. The hydraulic grade line is_________________?

   A. always above the centre line of pipe
   B. never above the energy grade line
   C. always sloping downward in the direction of flow
   D. all of the above

7. 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

8. In steady flow of a fluid, the total accele ration of any fluid particle______________?

   A. can be zero
   B. is never zero
   C. is always zero
   D. is independent of coordinates

9. 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

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)