In Newton’s law range, the terminal velocity of a solid spherical particle falling through a stationary fluid mass varies as the ______________ of its diameter?

Related Mcqs:

1. 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

2. The terminal velocity of a solid spherical particle falling through a stationary fluid mass in the Stoke’s law range is proportional to the_____________________?

   A. Inverse of fluid viscosity
   B. Square of particle size
   C. Difference in the densities of the particle & fluid
   D. All A., B. and C.

3. 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

4. The terminal velocity of a particle moving through a fluid varies as dp n. The value of n is equal to _______________ in Stoke’s law regime?

   A. 1
   B. 0.5
   C. 2
   D. 1.5

5. The terminal velocity of a particle moving through a fluid varies as dp n. What is the value of n’ for Newton’s law regime ?

   A. 0.5
   B. 1
   C. 1.5
   D. 3

6. What is the force required (in Newtons) to hold a spherical balloon stationary in water at a depth of H from the air-water interface? The balloon is of radius 0.1 m and is filled with air ?

   A. 4πg/3
   B. 0.01 πgH/4
   C. 0.01 πgH/8
   D. 0.04 πgH/3

7. 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

8. 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

9. 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

10. A bed of spherical particles (specific gravity 2.5) of uniform size 1500 μm is 0.5 m in diameter and 0.5 m high. In packed bed state, the porosity may be taken as 0.4. Ergun’s equation for the above fluid-particle system (in SI units) is given below : Δ P/L = 375 × 103 VOM + 10.94 × 106 V2 OM (SI units) If water is to be used as the fluidising medium, the minimum fluidisation velocity, VOM is_________________?

    A. 12 mm/s
    B. 16 mm/s
    C. 24 mm/s
    D. 28 mm/s