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 Raschig rings Cylinder (L/D = 1) Cube Sphere Raschig rings Cylinder (L/D = 1) Cube ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations A pebble mill Employs flints or ceramic pebbles as the grinding medium Both B and C Is a ball mill Is a tube mill lined with ceramic or other non-metallic liner Employs flints or ceramic pebbles as the grinding medium Both B and C Is a ball mill Is a tube mill lined with ceramic or other non-metallic liner 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)p (S/V)²p (S/V)p (S/V)f √(S/V)p (S/V)²p ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Which of the following gives the work required for size reduction of coal to -200 mesh in a ball mill most accurately ? Rittinger's law Kick's law None of these Bond's law Rittinger's law Kick's law None of these Bond's law ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations Gelatinous solid (which plug the septum) can be filtered by a __________ filter. Plate and frame Precoat Sparkler Vacuum leaf Plate and frame Precoat Sparkler Vacuum leaf ANSWER DOWNLOAD EXAMIANS APP
Mechanical Operations The optimum moisture content in solids to be crushed/ground ranges from __________ percent. 3 to 4 10 to 15 15 to 20 8 to 10 3 to 4 10 to 15 15 to 20 8 to 10 ANSWER DOWNLOAD EXAMIANS APP
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