Mechanical Operations Pick out the wrong statement pertaining to the roll crushers. Both the rolls run necessarily at the same speed For hard material's crushing, the reduction ratio should not exceed 4 Reduction ratio and differential roll speed affect production rate & energy consumed per unit of surface produced Maximum feed size determines the required roll diameter Both the rolls run necessarily at the same speed For hard material's crushing, the reduction ratio should not exceed 4 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 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)p (S/V)f (S/V)²p (S/V)p √(S/V)p (S/V)f (S/V)²p (S/V)p ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A tube mill compared to a ball mill Has a higher diameter/length ratio Uses much larger balls Produces a coarser product Has a higher length/diameter ratio Has a higher diameter/length ratio Uses much larger balls Produces a coarser product Has a higher length/diameter ratio ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations For Indian standard (IS) screens, the mesh number is equal to its aperture size expressed to the nearest deca-micron (0.01 mm). Aperture width of IS screen of mesh number 50 will be approximately __________ microns. 500 5 50 5000 500 5 50 5000 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In case of a hammer crusher, Reduction ratio can be varied by adjusting the distance from cage to hammers All of these Crushing takes place by impact breaking Maximum acceptable feed size is 30 cms Reduction ratio can be varied by adjusting the distance from cage to hammers All of these Crushing takes place by impact breaking Maximum acceptable feed size is 30 cms ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In the cyclone separator used for separation of dust from dust laden gas, the gas Is admitted tangentially at high velocity Enters the cyclone from the top Both B and C Develops a helical motion inside the chamber Is admitted tangentially at high velocity Enters the cyclone from the top Both B and C Develops a helical motion inside the chamber ANSWER DOWNLOAD EXAMIANS APP
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