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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Collector
Frother
Modifier
Activator

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Mechanical Operations
The unit of filter medium resistance is

Gm⁻¹
Cm⁻¹
Gm/cm⁻¹
Cm/gm⁻¹

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Mechanical Operations
What is the selectivity index, if the grade of tailings & concentrate is the same?

∞
0.5
1

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Mechanical Operations
increasing the capacity of a screen __________ the screen effectiveness.

Does not effect
Increases
Decreases
None of these

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Mechanical Operations
Sedimentation on commercial scale occurs in

Rotary drum filters
Cyclones
Classifiers
Thickeners

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Mechanical Operations
Laminar flow region is said to exist during agitation of a liquid in an agitator, when the value of Reynolds number is

>100
>10

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