Mechanical Operations Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity? Sphere Cube Raschig rings Cylinder (L/D = 1) Sphere Cube Raschig rings Cylinder (L/D = 1) ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is 6.35 kWh/ton 9.0 kWh/ton 25.4 kWh/ton 18 kWh/ton 6.35 kWh/ton 9.0 kWh/ton 25.4 kWh/ton 18 kWh/ton ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The term 'angle of nip' is concerned with the operation of the __________ crushers. None of these Jaw Gyratory Roll None of these Jaw Gyratory Roll ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Toothed roll crushers achieve size reduction by Impact and attrition Both A & B Tearing (shear) and compression Neither A nor B Impact and attrition Both A & B Tearing (shear) and compression Neither A nor B ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)? Froth floatation Baum jig washer Spiral separator Trough washer Froth floatation Baum jig washer Spiral separator Trough washer ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The main differentiation factor between tube mill and ball mill is the Size of the grinding media Final product size Length to diameter ratio Operating speed Size of the grinding media Final product size Length to diameter ratio Operating speed ANSWER DOWNLOAD EXAMIANS APP
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