Gold ore concentration is mostly done using___________________?

Related Mcqs:

1. Ore concentration by jigging is based on the difference in the ______________ of the particles?

   A. Specific gravities
   B. Wettability
   C. Shape
   D. None of these

2. Which of the following oxides is not present in hematite iron ore ?

   A. Titanium oxide
   B. Calcium oxide
   C. Cobalt oxide
   D. Manganese oxide

3. For benefication of iron ore, the most commonly used method is______________?

   A. Flocculation
   B. Froth floatation
   C. Jigging & tabling
   D. None of these

4. 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

5. 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

6. The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size)?

   A. c/s
   B. s/c
   C. s . c
   D. 1/s . c

7. Separation of isotopes is generally done using a/an _______________ centrifuge?

   A. Ultra
   B. Disk-bowl
   C. Both A. & B.
   D. Neither A. nor B.

8. Removal of activated carbon from glycerine is done by _________________?

   A. Plate and frame filter
   B. Rotary vacuum filter
   C. Batch basket centrifuge
   D. None of these

9. Introduction of slurry in a plate and frame filter press is done through a plate in each frame. The plate of this filter has a _______________ surface?

   A. Plane
   B. Curved
   C. Ribbed
   D. Either A. or B.

10. Sizing of very fine particles of the order of 5 to 10 microns is done by elutriation, which is a _____________ operation?

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