Mechanical Operations Work index is defined as the Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen Energy needed to crush one tonne of feed to 200 microns Energy needed to crush one ton of feed to 100 microns Gross energy (kWh/ton of feed) needed to reduce very large feed to such a size that 80% of the product passes through a 100 micron screen Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen Energy needed to crush one tonne of feed to 200 microns Energy needed to crush one ton of feed to 100 microns ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Trommels separate a mixture of particles depending on their Electrical & magnetic properties Size Wettability Density Electrical & magnetic properties Size Wettability Density ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Cumulative analysis for determining surface is more precise than differential analysis, because of the None of these Assumption that all particles in a single fraction are equal in size Fact that screening is more effective Assumption that all particles in a single fraction are equal in size, is not needed None of these Assumption that all particles in a single fraction are equal in size Fact that screening is more effective Assumption that all particles in a single fraction are equal in size, is not needed ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles) M . Vp/ρ Vp/m . ρ M . ρ/Vp M/ρ . Vp M . Vp/ρ Vp/m . ρ M . ρ/Vp M/ρ . Vp ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In case of a ball mill, Coarse feed requires a larger ball Fine feed requires a larger ball Operating speed should be more than the critical speed None of these Coarse feed requires a larger ball Fine feed requires a larger ball Operating speed should be more than the critical speed None of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Size reduction mechanism used in Jaw crushers is Attrition Impact Cutting Compression Attrition Impact Cutting Compression ANSWER DOWNLOAD EXAMIANS APP
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