A. Carbonates
B. Sulphates
C. Silicates & phosphates
D. Bi-carbonates
Related Mcqs:
- Additives used for promoting the flocculation of particles is a/an _____________________?
A. Electrolyte
B. Surface active agent
C. Both A. & B.
D. Neither A. nor B. - 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 - Which of the following is not used as a surface active agent in a flocculation operation ?
A. Sodium silicate
B. Quartz
C. Lime
D. Alumina - ______________ are used for the separation of coarse particles from a slurry of fine particles?
A. Thickeners
B. Classifiers
C. Hydrocyclones
D. Decanters - The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond’s law) of the energy to grind the particles from a very large size to 50 μm is________________?
A. 6.35 kWh/ton
B. 9.0 kWh/ton
C. 18 kWh/ton
D. 25.4 kWh/ton - 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 - Screw conveyors are________________?
A. Run at very high rpm
B. Suitable for sticky materials
C. Suitable for highly abrasive materials
D. All A., B. and C. - Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with ______________ to get the same for dry grinding?
A. 1.0
B. 0.5
C. 1.34
D. 4.34 - 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 - 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
