The co-efficient of drag and lift for an incompressible fluid depends on the_________________?

Related Mcqs:

1. Bernoulli’s equation for fluid flow is derived following certain assumptions. Out of the assumptions listed below, which set of assumptions is used in derivation of Bernoulli’s equation? A. Fluid flow is frictionless & irrotational. B. Fluid flow is steady. C. Fluid flow is uniform & turbulent. D. Fluid is compressible. E. Fluid is incompressible ?

   A. A, C, D
   B. B, D, E
   C. A, B, E
   D. A, D, E

2. The ratio of the wall drag to the form drag in the Stoke’s law range (for motion of spherical particles in a stationary fluid) is__________________?

   A. 0.5
   B. 1
   C. 2
   D. 0.33

3. Actual lift of a pump is always less than the theoretical lift and is limited by the__________________________?

   A. Specific gravity & temperature of the liquid
   B. Leakage & pressure decreasing at higher elevations
   C. Frictional resistance through pipes, fittings & passages
   D. All A., B. and C.

4. In Newton’s law range, the drag co-efficient for the motion of spherical particle in a stationary fluid is___________________?

   A. 0.44
   B. 0.044
   C. 4.4
   D. 44

5. Drag co-efficient for motion of spherical particles in a stationary fluid in the stoke’s law range is_________________?

   A. 24/NRe,P
   B. 16/NRe,P
   C. 64/NRe,P
   D. 48/NRe,P

6. For motion of spherical particles in a stationary fluid, the drag co-efficient in hindered settling compared to that in free settling is _______________?

   A. More
   B. Less
   C. Equal
   D. More or less, depending on the type of particle

7. In an incompressible flow of fluid, the fluid ________________?

   A. Temperature remains constant
   B. Compressibility is greater than zero
   C. Density does not change with pressure & temperature
   D. Is frictionless

8. In which of the following body shapes, the pressure drag is large compared to the friction drag ?

   A. Stream line body
   B. Two dimensional body
   C. Bluff body
   D. None of these

9. The ratio of wall drag to total drag in the Stoke’s law range is_________________?

   A. 0.5
   B. 1
   C. 1/3
   D. 2/3

10. Pressure drag does not depend upon the_________________?

    A. Roughness of surface of the body
    B. Pressure of main flow only
    C. Length of the body in flow direction
    D. All A., B. and C.