Mechanical Operations Work index is defined as the Energy needed to crush one ton of feed to 100 microns Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen 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 needed to crush one tonne of feed to 200 microns Energy needed to crush one ton of feed to 100 microns Energy (kWh/ton of feed) needed to crush small feed to such a size that 80% of the product passes a 200 mesh screen 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 needed to crush one tonne of feed to 200 microns ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Pick out the wrong statement pertaining to the roll crushers. For hard material's crushing, the reduction ratio should not exceed 4 Both the rolls run necessarily at the same speed Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced Maximum feed size determines the required roll diameter For hard material's crushing, the reduction ratio should not exceed 4 Both the rolls run necessarily at the same speed Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced Maximum feed size determines the required roll diameter ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill. Neither A nor B Cage Both A & B Hammer Neither A nor B Cage Both A & B Hammer ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Handling of ashes and similar materials can be done best by a __________ conveyor. Belt Flight Ribbon Drag or slat Belt Flight Ribbon Drag or slat ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The critical speed of a trommel (N) is related to its dia (D) as N ∝ 1/√D N ∝ 1/D N ∝ √D N ∝ D N ∝ 1/√D N ∝ 1/D N ∝ √D N ∝ D ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Fick's law relates to Final particle size Feed size None of these Energy consumption Final particle size Feed size None of these Energy consumption ANSWER DOWNLOAD EXAMIANS APP
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