Related Questions

The work index in Bond's law for crushing of solids has the following dimensions
A No units (dimensionless)
B kWh/ton
C kW/ton
D $${\text{kWh}}.{{\text{m}}^{\frac{1}{2}}}/{\text{ton}}$$
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
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?
A 16°
B 32°
C 40°
D 46°
Choke crushing (in case of a Jaw crusher) compared to free crushing
A Results in increased capacity
B Consumes less power
C Consumes more power
D Both A and C
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
Bond crushing law
A calls for relatively less energy for the smaller product particles than does the Rittinger's law
B is less realistic in estimating the power requirements of commercial crushers
C states that the work required to form particle of any size from very large feed is proportional to the square root of the volume to surface ratio of the product
D states that the work required for the crushing is proportional to the new surface created
According to Raoult's law, "The vapor pressure exerted by component in a solution is proportional to the mole fraction of that component." Raoult's law is not applicable under the following assumption/condition.
A No component is concentrated at the surface of the solution
B The component molecules are non polar and are of almost equal size
C In the formation of solution, chemical combination/molecular association between unlike molecules takes place
D The attractive forces between like and unlike molecules are almost equal
Crushing resistance required to crush the rivet per pitch length is
A $${\text{pd}}{\sigma _{\text{c}}}$$
B $${\text{pt}}{\sigma _{\text{c}}}$$
C $${\text{ndt}}{\sigma _{\text{c}}}$$
D $$\left( {{\text{p}} - {\text{d}}} \right){\text{t}}{\sigma _{\text{c}}}$$
The pull required to tear off the plate per pitch length is (where p = Pitch of rivets, t = Thickness of plates and $${\sigma _{\text{t}}},\,\tau $$  and $${\sigma _{\text{c}}}$$ = Permissible tensile, shearing and crushing stresses respectively)
A $$\left( {{\text{p}} - 2{\text{d}}} \right){\text{t}} \times {\sigma _{\text{c}}}$$
B $$\left( {{\text{p}} - {\text{d}}} \right){\text{t}} \times \tau $$
C $$\left( {{\text{p}} - {\text{d}}} \right){\text{t}} \times {\sigma _{\text{t}}}$$
D $$\left( {2{\text{p}} - {\text{d}}} \right){\text{t}} \times {\sigma _{\text{t}}}$$
Which of the following gives the crushing energy required to create new surface ?
A Taggarts rule
B Fick's law
C Rittinger's law
D None of these

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