For spheres, the specific surface shape factor is given by___________________?

Related Mcqs:

1. For spheres, the surface shape factor is given by (where, A = area, V = volume, and D = diameter) ?

   A. π = (A/D2)
   B. π/6 = (V/D3)
   C. AD/V
   D. None of these

2. For spheres, volume shape factor is given by____________________?

   A. π = (A/D2)
   B. 2π = (2A/D2)
   C. π/6 = (V/D3)
   D. AD/V

3. Specific surface area is the surface area of a unit _______________ of materials?

   A. Weight
   B. Volume
   C. Either A. or B.
   D. Neither A. nor B.

4. The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle) ?

   A. 6/D.ρ
   B. 2/D.ρ
   C. 4/D.ρ
   D. 12/D.ρ

5. Shape factor for a cylinder whose length equals its diameter is_________________?

   A. 1.5
   B. 0.5
   C. 1.0
   D. 2.0

6. Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity ?

   A. Sphere
   B. Cube
   C. Cylinder (L/D = 1)
   D. Raschig rings

7. The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?

   A. D2
   B. Dp
   C. 1/Dp
   D. 1/D2p

8. Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate) ?

   A. S
   B. 1/R
   C. 1/μ
   D. All A., B. & C.

9. Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle)?

   A. 6.V/D.S
   B. V/6D.S
   C. D.S/V
   D. V/D.S

10. The basic filtration equation is given as dt/dV = (μ/A ΔP). [(α .CV/A) + Rm], where, V is volume of the filtrate; A is the filtration area, a is specific cake resistance, μ is viscosity of the filtrate, and C is the concentration of the solids in the feed slurry. In a 20 minutes constant rate filtration, 5 m3 of filtrate was obtained. If this is followed by a constant pressure filtration, how much more time in minutes, it will take for another 5 m3 of filtrate to be produced? Neglect filter medium resistance, Rm; assume incompressible cake ?

    A. 10
    B. 20
    C. 25
    D. 30