Sorting classifiers employing differential settling methods for separation of particles make use of the differences in their_________________?

Related Mcqs:

1. A suspension of glass beads in ethylene glycol has a hindered settling velocity of 1.7 mm/s, while the terminal settling velocity of a single glass bead in ethylene glycol is 17 mm/s. If the Richardson-Zaki hindered settling index is 4.5, the volume fraction of solids in the suspension is_____________?

   A. 0.1
   B. 0.4
   C. 0.6
   D. None of these

2. A 30% (by volume) suspension of spherical sand particles in a viscous oil has a hindered settling velocity of 4.44 μm/s. If the Richardson Zaki hindered settling index is 4.5, then the terminal velocity of a sand grain is_________________?

   A. 0.90 μm/s
   B. 1 μm/s
   C. 22.1 μm/s
   D. 0.02 μm/s

3. ______________ are used for the separation of coarse particles from a slurry of fine particles?

   A. Thickeners
   B. Classifiers
   C. Hydrocyclones
   D. Decanters

4. Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles) ?

   A. m/ρ . Vp
   B. m . ρ/Vp
   C. m . Vp/ρ
   D. Vp/m . ρ

5. In classification, particles are said to be equal settling, if they have the same terminal velocities in the_______________?

   A. Different fluids
   B. Same fluid
   C. Same field of force
   D. Both B. and C.

6. Two particles are called to be equal settling, if they are having the same ?

   A. Size
   B. Specific gravity
   C. Terminal velocities in the same fluid & in the same field of force
   D. None of these

7. Separation of a suspension or slurry into a supernatant clear liquid (free from particles) and a thick sludge containing a high concentration of solid is called__________________?

   A. Classification
   B. Sedimentation
   C. Clarification
   D. Decantation

8. Ultra centrifuges are used for the separation of _____________ solid particles?

   A. Coarse
   B. Fine
   C. Colloidal
   D. Dissolved

9. Solid particles separation based on the difference in their flow velocities through fluids is termed as the__________________?

   A. Clarification
   B. Classification
   C. Elutriation
   D. Sedimentation

10. Separation of solid particles based on their densities is called_________________?

    A. Sizing
    B. Sorting
    C. Clarification
    D. Dispersion