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Mechanical Operations

Mechanical Operations
Limestone is normally crushed in a

Roll crusher
Hammer crusher
Ball mill
Tube mill

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Mechanical Operations
__________ conveyors are also called scrapers.

Helical flight
Apron
Screw
Both B & C

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Mechanical Operations
General mechanism of size reduction in intermediate and fine grinder is by

Compression
Impact and attrition
Cutting action
Compression and tearing

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 V.W. ρ
3.6 W.Dr.ρ
3.6 V.W.Dr.ρ
3.6 V.W.Dr/ρ

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Mechanical Operations
With increase in the capacity of screens, the screen effectiveness

Remains unchanged
Decreases
Decreases exponentially
Increases

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

0.0074 cm
0.0074 mm
0.0047 cm
74 mili-microns

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