Mechanical Operations The specific surface of sherical particles is proportional to (where, Dp = diameter of particle). 1/Dp 1/D²p D²p Dp 1/Dp 1/D²p D²p Dp ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Trommels separate a mixture of particles depending on their Density Wettability Size Electrical & magnetic properties Density Wettability Size Electrical & magnetic properties ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A tube mill compared to a ball mill Uses much larger balls Has a higher diameter/length ratio Produces a coarser product Has a higher length/diameter ratio Uses much larger balls Has a higher diameter/length ratio Produces a coarser product Has a higher length/diameter ratio ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake) Independent of ΔP ∝ √ΔP ∝ ΔP ∝ 1/ ΔP Independent of ΔP ∝ √ΔP ∝ ΔP ∝ 1/ ΔP ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ? Kick's law Rittinger's law Bond's law None of these Kick's law Rittinger's law Bond's law None of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The opening of a 200 mesh screen (Taylor series) is 0.0074 mm 0.0074 cm 74 mili-microns 0.0047 cm 0.0074 mm 0.0074 cm 74 mili-microns 0.0047 cm ANSWER DOWNLOAD EXAMIANS APP
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