Mechanical Operations Work index is defined as the 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 Energy needed to crush one ton of feed to 100 microns ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Gummy & sticky materials like molasses, sugar etc. are best transported/handled by using a __________ conveyor. Screw Drag Ribbon Slat Screw Drag Ribbon Slat ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The value of work index does not change materially from one equipment to another. If the value of work index determined for close circuit grinding is Wi, then the same for open circuit grinding will be Wi 0.5 Wi 1.34 Wi 3.34 Wi Wi 0.5 Wi 1.34 Wi 3.34 Wi ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The critical speed of a trommel (N) is related to its dia (D) as N ∝ 1/√D N ∝ D N ∝ √D N ∝ 1/D N ∝ 1/√D N ∝ D N ∝ √D N ∝ 1/D ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills. Metalliferrous ores Asbestos & mica Non-metallic ores Basic slags Metalliferrous ores Asbestos & mica Non-metallic ores Basic slags ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing. Fine Secondary Ultrafine Primary Fine Secondary Ultrafine Primary ANSWER DOWNLOAD EXAMIANS APP
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