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Mechanical Operations

Mechanical Operations
__________ mill is not a revolving mill.

Tube
Compartment
Cage
Pebble

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Mechanical Operations
The opening of a 200 mesh screen (Taylor series) is

74 mili-microns
0.0074 mm
0.0074 cm
0.0047 cm

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

1.5 D
2 D
0.5 D
D

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Mechanical Operations
Tube mill compared to ball mill

Uses smaller balls
Is long in comparison with its diameter
All of these
Produces finer products

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Mechanical Operations
In case of a ball mill,

Coarse feed requires a larger ball
Operating speed should be more than the critical speed
None of these
Fine feed requires a larger ball

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Mechanical Operations
200 mesh seive size corresponds to __________ microns.

154
200
74
24

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