Deformation drag, which is caused by widespread deformation of fluid around the immersed body____________________?

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. As per Newton’s law of viscosity, the shear stress for a given rate of angular deformation of fluid is proportional to (where, μ = fluid viscosity) ?

   A. 1/μ
   B. μ
   C. μ2
   D. 1/μ2

4. A fluid which has a linear relationship between the magnitude of applied shear-stress and the resulting rate of deformation is called a/an _____________ fluid?

   A. Newtonian
   B. Non-Newtonian
   C. Ideal
   D. Incompressible

5. 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

6. 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

7. Drag co-efficient for flow past immersed body is the ratio of _____________ to the product of velocity head and density?

   A. Shear stress
   B. Shear force
   C. Average drag per unit projected area
   D. None of these

8. Drag is the force component exerted on an immersed object, ?

   A. Passing the centroid of the body at 60°to the direction of motion
   B. The component being parallel to the flow direction
   C. The component being normal to the flow direction
   D. None of these

9. An ideal plastic substance indicates no deformation, when stressed upto yield stress, but behaves like a Newtonian fluid beyond yield stress. Which of the following is an ideal plastic ?

   A. Sewage sludge
   B. Rubber latex
   C. Blood
   D. Sugar solution

10. 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