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 25.4 kWh/ton 18 kWh/ton 9.0 kWh/ton 6.35 kWh/ton 25.4 kWh/ton 18 kWh/ton 9.0 kWh/ton ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as Np ∝ NRe Np ∝ √NRe Np → constant Np ∝ 1/NRe Np ∝ NRe Np ∝ √NRe Np → constant Np ∝ 1/NRe ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Pine oil and cresylic acid are used as __________ in the froth floatation process. Frother Collector Conditioner Depressor Frother Collector Conditioner Depressor ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations What is the selectivity index, if the grade of tailings & concentrate is the same? ∞ 1 0.5 ∞ 1 0.5 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Filtration operation carried out by continuous increase of the inlet pressure of slurry, is called the __________ filtration. Varying pressure Varying rate Constant rate Constant pressure Varying pressure Varying rate Constant rate Constant pressure ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Separation of particles of various sizes, shapes and densities by allowing them to settle in a fluid is called Thickening Froth floatation Classification Clarification Thickening Froth floatation Classification Clarification ANSWER DOWNLOAD EXAMIANS APP
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