Mechanical Operations Actual operating speed of a ball mill may vary from 65 to 80% of the critical speed. Which of the following duties would require the ball mill to be operated at maximum percentage of critical speed? Wet grinding in high viscous suspension Dry grinding of large particles (upto 1.25 cms) Wet grinding in low viscous suspension Dry grindng of large particles in un-baffed mills Wet grinding in high viscous suspension Dry grinding of large particles (upto 1.25 cms) Wet grinding in low viscous suspension Dry grindng of large particles in un-baffed mills ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Toothed roll crushers achieve size reduction by Tearing (shear) and compression Impact and attrition Both A & B Neither A nor B Tearing (shear) and compression Impact and attrition Both A & B Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations In coal washeries, three products namely the valuable product (i.e. clean/washed coal), discarded product (i.e. mineral matter) and an additional concentrated product called __________ is produced. Concentrate Middling Tailing None of these Concentrate Middling Tailing None of these ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Sauter mean diameter is the same as the __________ mean diameter. Mass Arithmetic Volume-surface Geometric Mass Arithmetic Volume-surface Geometric 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 5000 50 5 500 5000 50 5 ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³) 3.6 AVS.ρ 3.6 AVS/ρ 3.6 A.S. ρ 3.6 A.V.ρ 3.6 AVS.ρ 3.6 AVS/ρ 3.6 A.S. ρ 3.6 A.V.ρ ANSWER DOWNLOAD EXAMIANS APP
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