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Mechanical Operations

Mechanical Operations
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.

Slat or drag
Screw
Flight
Ribbon

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Mechanical Operations
Grinding characteristic of a material is given by its

Angle of repose
Abrasion index
Shatter index
HGI

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Mechanical Operations
Use of 'grinding aids' is done in __________ grinding.

Ultrafine
Wet
Dry
Intermediate

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Mechanical Operations
A sand mixture was screened through a standard 10-mesh screen. The mass fraction of the oversize material in feed, overflow and underflow were found to be 0.38, 0.79 and 0.22 respectively. The screen effectiveness based on the oversize is

0.68
0.5
0.62
0.58

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Bronze
Flint or porcelain
Concrete
Stainless steel

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Mechanical Operations
Stamp mills are generally used for crushing

Iron ores
Talc
Diamond
Gold ores

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