Sauter mean diameter is the same as the ______________ mean diameter?

Related Mcqs:

1. ______________ mean diameter of particles is given by Σ (xi/Dpi ⃗)?

   A. Mass
   B. Volume
   C. Arithmetic
   D. Volume surface

2. Which of the following equations is Rittinger’s crushing law? (Where P = power required by the machine, m = feed rate, k = a constant, D̅ sa & D̅ sb = volume surface mean diameter of feed & product respectively) ?

   A. P/m = K/ √Dp
   B. P/m = K . ln D̅ sa/D̅ sb
   C. P/m = K . (1/ D̅ sb – 1/D̅ sa)
   D. None of these

3. Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter) ?

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

4. Equivalent diameter of a particle is the diameter of the sphere having the same __________________?

   A. Ratio of surface to volume as the actual volume
   B. Ratio of volume to surface as the particle
   C. Volume as the particle
   D. None of these

5. _______________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals?

   A. Separation efficiency
   B. Selectivity index
   C. Concentration ratio
   D. None of these

6. Sphericity of raschig ring (whose length and diameter are equal) is___________________?

   A. > 1
   B. < 1
   C. 1
   D. 2

7. 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

8. For a turbine agitated and baffled tank, operating at low Reynold’s number (based on impeller diameter), the power number (Np) varies with NRe as_________________?

   A. Np ∝ NRe
   B. Np ∝ √NRe
   C. Np → constant
   D. Np ∝ 1/NRe

9. For a cyclone of diameter 0.2 m with a tangential velocity of 15 m/s at the wall, the separation factor is__________________?

   A. 2250
   B. 1125
   C. 460
   D. 230

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

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