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Mechanical Operations

Mechanical Operations
__________ are used for the separation of coarse particles from a slurry of fine particles.

Classifiers
Decanters
Thickeners
Hydrocyclones

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Mechanical Operations
All resistances during washing of cake

None of these
Decreases
Remain constant
Increases

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Mechanical Operations
In a ball mill, the volume occupied by the balls (when the mill is stopped) is about __________ percent of the volume of the mill.

50
85
35
70

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Mechanical Operations
The unit of filter medium resistance is

Gm/cm⁻¹
Cm⁻¹
Gm⁻¹
Cm/gm⁻¹

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Mechanical Operations
The cake resistance increases steadily with the time of filtration in a plate and frame filter employing constant __________ filtration.

Rate
Both A & B
Neither A nor B
Pressure

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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
Separation efficiency
Selectivity index
None of these

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