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Mechanical Operations

Mechanical Operations
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.

Cast iron
Maximum size
Elliptical
Minimum size

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Mechanical Operations
Tabling process used for separating two materials of different densities by passing the dilute pulp over a table/deck, which is inclined from the horizontal surface at an angle of about

2 to 5°
5 to 10°
10 to 15°
1 to 2°

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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.

5
500
5000
50

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Mechanical Operations
The ratio of the actual mesh dimension of Taylor series to that of the next smaller screen is

2
√2
√3
1.5

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Mechanical Operations
To get ultrafine particles, the equipment used is a

Ball mill
Rod mill
Fluid energy mill
Hammer crusher

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Mechanical Operations
Activators are those chemicals which help buoying up one mineral in preference to the other in the froth floatation process. Which of the following is an activator?

Sodium carbonate
Copper sulphate
Calcium carbonate
Cresylic acid

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