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Mechanical Operations

Mechanical Operations
Balls for ball mills are never made of

Forged/cast steel
Cast iron
Lead
Alloy steel

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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?

Cube
Raschig rings
Sphere
Cylinder (L/D = 1)

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Mechanical Operations
Sphericity for a non-spherical particle is given by (where, V and S are volume and surface area respectively of one particle. and, D = equivalent diameter of particle).

S/V
V/6D.S
V/D.S
6.V/D.S

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Mechanical Operations
Which is the most suitable conveyor for transportation of sticky material?

Belt conveyor
Apron conveyor
Screw conveyor
Pneumatic conveyor

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Mechanical Operations
Pick out the material having minimum Rittinger's number.

Galena
Quartz
Pyrite
Calcite

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Mechanical Operations
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

Metalliferrous ores
Basic slags
Non-metallic ores
Asbestos & mica

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