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Mechanical Operations

Mechanical Operations
For achieving maximum capacity of the ball mill, the ball charge should be equal to about __________ percent of the ball mill volume.

25
50
10
75

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Mechanical Operations
Feed size of ≥ 25 cms can be accepted by

Rod mill
Jaw crusher
Ball mill
Fluid energy mill

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Mechanical Operations
Wheat is ground into flour in a

Fluid energy mill
Hammer crusher
Impact mill
Roller crusher

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Mechanical Operations
__________ is defined as the geometric mean of the relative rejections and the relative recoveries of two minerals.

Concentration ratio
None of these
Separation efficiency
Selectivity index

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Mechanical Operations
In constant pressure filtration,

Rate of filtration decreases with time
Rate of filtration increases with time
Rate of filtration is constant
Resistance decreases with time

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Mechanical Operations
For a turbine agitated and baffled tank, operating at low Reynold's number (based on impeller diameter), the power number (Np) varies with NRe as

Np ∝ 1/NRe
Np ∝ √NRe
Np → constant
Np ∝ NRe

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