Forces acting on a particle settling in fluid are _____________ forces?

Related Mcqs:

1. A particle A of diameter 10 microns settles in an oil of specific gravity 0.9 and viscosity 10 poise under Stoke’s law. A particle B with diameter 20 microns settling in the same oil will have a settling velocity ?

   A. Same as that of A
   B. One fourth as that of A
   C. Twice as that of A
   D. Four times as that of A

2. Brownian movement is prominent in the particle size range of _____________ microns in case of settling of a particle in a fluid?

   A. 2 to 3
   B. 0.01 to 0.10
   C. 200 to 300
   D. 100 to 1000

3. 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

4. For a particle settling in water at its terminal settling velocity, which of the following is true ?

   A. Buoyancy = weight + drag
   B. Weight = buoyancy + drag
   C. Drag = buoyancy + weight
   D. Drag = weight

5. 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

6. Drag co-efficient in hindered settling is _____________ that in free settling?

   A. Less than
   B. Equal to
   C. Not necessarily greater than
   D. Always greater than

7. For the free settling of a spherical particle through a fluid, the slope of, CD-log NRe, plot is____________________?

   A. 1
   B. -1
   C. 0.5
   D. -0.5

8. _____________ forces act on a particle moving through a stationary fluid?

   A. Gravity
   B. Drag
   C. Buoyant
   D. All A., B., & C.

9. In the Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass is ______________ the fluid viscosity?

   A. Directly proportional to
   B. Inversely proportional to
   C. Inversely proportional to the square root of
   D. Independent of

10. The terminal velocity of a small sphere settling in a viscous fluid varies as the___________________?

    A. First power of its diameter
    B. Inverse of the fluid viscosity
    C. Inverse square of the diameter
    D. Square of the difference in specific weights of solid & fluid