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Mechanical Operations

Mechanical Operations
The reduction ratio for grinders is defined as(where, Df and Dp are average diameters of feed and product respectively).

None of these
Dp/Df
Df - Dp
Df/Dp

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Mechanical Operations
Size measurement of ultrafine particles can be best expressed in terms of

Centimetre
Micron
Surface area per unit mass
Screen size

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Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Brinkman
Weber
Schmidt
Peclet

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Compression
Attrition
Impact
Cutting

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Mechanical Operations
Separation of solid particles based on their densities is called

Sizing
Sorting
Dispersion
Clarification

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Mechanical Operations
Pine oil used in froth floatation technique acts as a/an

Collector
Modifier
Activator
Frother

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