A. Talc
B. Feldspar
C. Corundum
D. Calcite
Related Mcqs:
- Rittinger’s number designates the new surface created per unit mechanical energy absorbed by the material being crushed. Larger value of Rittinger’s number of a material indicates its________________?
A. Easier grindability
B. Poor grindability
C. High power consumption in grinding
D. None of these - Which of the following is the hardest material ?
A. Calcite
B. Quartz
C. Corundum
D. Gypsum - Mechanical conveyors which push the material along an endless trough or tube are called scrappers. Which of the following conveying equipments comes under the category of „scrappers‟ ?
A. Bucket conveyor
B. Flight conveyor
C. Screw conveyor
D. Both B. and C. - Energy consumed for crushing one ton of material ranges from ______________ kWh?
A. 0.01 to 0.1
B. 0.5 to 1.5
C. 2 to 3.5
D. 4 to 5 - Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripheral velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m3 here, V =πND where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m) ?
A. 3.6 V.W.Dr.ρ
B. 3.6 V.W. ρ
C. 3.6 W.Dr.ρ
D. 3.6 V.W.Dr/ρ - Which is the most suitable conveyor for transportation of sticky material ?
A. Apron conveyor
B. Belt conveyor
C. Screw conveyor
D. Pneumatic conveyor - Pick out the material having minimum Rittinger’s number?
A. Calcite
B. Pyrite
C. Quartz
D. Galena - A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is_________________?
A. 0.50
B. 0.58
C. 0.68
D. 0.62 - Grinding characteristic of a material is given by its___________________?
A. HGI
B. Angle of repose
C. Shatter index
D. Abrasion index - Grindability of a material does not depend upon its_____________________?
A. Elasticity
B. Hardness
C. Toughness
D. Size
