Mechanical Operations According to Bond crushing law, the work required to form particle of size 'D' from very large feed is (where (S/V)p and (S/V)f are surface to volume ratio of the product and feed respectively). (S/V)f (S/V)p √(S/V)p (S/V)²p (S/V)f (S/V)p √(S/V)p (S/V)²p ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Trommels are revolving screens which normally operate in the range of __________ rpm. 15 - 20 40 - 50 60 - 75 43832 15 - 20 40 - 50 60 - 75 43832 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The most suitable equipment for the transportation of 200 mesh size particles is a Screw conveyor Belt conveyor Bucket elevator Pneumatic conveyor Screw conveyor Belt conveyor Bucket elevator Pneumatic conveyor ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are Silicates & phosphates Sulphates Carbonates Bi-carbonates Silicates & phosphates Sulphates Carbonates Bi-carbonates ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Work index is defined as the Energy needed to crush one tonne of feed to 200 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 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 needed to crush one tonne of feed to 200 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 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 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Use of baffles in agitators help in minimising the __________ tendency. Vortexing Both A & B Neither A nor B Swirling Vortexing Both A & B Neither A nor B Swirling ANSWER DOWNLOAD EXAMIANS APP
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