Mechanical Operations 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 μrn is 6.35 kWh/ton 9.0 kWh/ton 18 kWh/ton 25.4 kWh/ton 6.35 kWh/ton 9.0 kWh/ton 18 kWh/ton 25.4 kWh/ton ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator? Sodium carbonate Copper sulphate Cresylic acid Calcium carbonate Sodium carbonate Copper sulphate Cresylic acid Calcium carbonate ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Gizzlies are used for separating __________ solids. Any size Fine Coarse None of these Any size Fine Coarse None of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The resistance offered by the filter used in a bag filter is proportional to (where, c = dust concentration, and s = particle size ) S . c C/s 1/s . c S/c S . c C/s 1/s . c S/c ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following terminology is not used for size reduction of materials to fine sizes or powders? Dispersion Comminution Compression Pulverisation Dispersion Comminution Compression Pulverisation ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A centrifugal filtration unit operating at a rotational speed of w has inner surface of the liquid (density ρL) located at a radial distance R from the axis of rotation. The thickness of the liquid film is δ and no cake is formed. The initial pressure drop during filtration is ½w² . δρL (2R + δ) ½w² . δ² . ρL ½w² . R . ρL(R + 2δ) ½w² . R² . ρL ½w² . δρL (2R + δ) ½w² . δ² . ρL ½w² . R . ρL(R + 2δ) ½w² . R² . ρL ANSWER DOWNLOAD EXAMIANS APP
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