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Mechanical Operations

Mechanical Operations
Size reduction of asbestos and mica is done by

Gyratory crushers
Crushing rolls
Rod mills
Hammer mills

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Mechanical Operations
Pulverised coal passing through 200 mesh screen has a diameter of 0.074 mm (74 micron). The same passing through 50 mesh screen will have a dia of __________ mm.

0.3
0.014
0.007
50

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Mechanical Operations
For the preliminary breaking of hard rock, we use a

Tube mill
Ball mill
Squirrel-cage disintegrator
Gyratory crusher

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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
1.5
√3
√2

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Mechanical Operations
In classification, particles are said to be equal settling, if they have the same terminal velocities in the

Same field of force
Different fluids
Same fluid
Both B and C

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Mechanical Operations
Tube mill compared to ball mill

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

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