A. Electrolyte
B. Surface active agent
C. Both A. & B.
D. Neither A. nor B.
Related Mcqs:
- Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are________________?
A. Carbonates
B. Sulphates
C. Silicates & phosphates
D. Bi-carbonates - 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 - Solid particles of different densities are separated by _____________________?
A. Filters
B. Thickness
C. Cyclones
D. Sorting classifier - The specific surface of spherical particles is proportional to (where, Dp = diameter of particle)?
A. D2
B. Dp
C. 1/Dp
D. 1/D2p - 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 - Trommels separate a mixture of particles depending on their_____________________?
A. Size
B. Density
C. Wettability
D. Electrical & magnetic properties
