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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
Pick out the material having minimum Rittinger's number.
A Calcite
B Pyrite
C Quartz
D Galena
Energy requirement (per unit mass of material crushed/ground) is highest for
A Jaw crusher
B Rod mill
C Ball mill
D Fluid energy mill
Rittinger's crushing law states that
A Work required to form a particle of any size is proportional to the square of the surface to volume ratio of the product
B Work required to form a particle of a particular size is proportional to the square root of the surface to volume ratio of the product
C Work required in crushing is proportional to the new surface created
D For a given machine and feed, crushing efficiency is dependent on the size of the feed & product
The constants (Kb, Kr and Kk) used in the laws of crushing (i.e., Bond's law, Rittinger's law and Kick's law) depend upon the
A Feed material
B Type of crushing machine
C Both A & B
D Neither A nor B
For crushing of solids, the Rittinger's law states that the work required for crushing is proportional to
A The new surface created
B The size reduction ratio
C The change in volume due to crushing
D None of these
What Designates where the next action occurs?
A Decode
B Highlight
C Select
D Mother board
The surface of a certain planet reflects 80 percent of the light that strikes it. The clouds around the planet then absorb 40 percent of the reflected light. What percent of the light that strikes the planet is reflected from the surface and passes through the clouds without being absorbed?
A 32%
B 40%
C 48%
D 60%
Use of raschig rings in place of crushed stones as packing in packed beds (other things being same)
A Increases pressure drop, increases surface area
B Increases pressure drop, decreases surface area
C Decreases pressure drop, increases surface area
D Decreases pressure drop, decreases surface area
The material is crushed in a gyratory crusher by the action of
A impact
B compression
C attrition
D cutting

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