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Mechanical Operations

Mechanical Operations
Soft & non-abrasive materials can be made into fines by

None of these
Cutting
Attrition
Compression

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Mechanical Operations
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by

Φs = 6 Vp/dp sp
Φs = 6 dp Sp/Vp
Φs = dp Sp/Vp
Φs = Vp/dp sp

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Mechanical Operations
The main differentiation factor between tube mill and ball mill is the

Length to diameter ratio
Size of the grinding media
Final product size
Operating speed

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Mechanical Operations
A propeller agitator

Runs at very slow speed (2 rpm)
Is used for mixing high viscosity pastes
All of these
Produces mainly axial flow

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Mechanical Operations
Which of the following oxides is not present in hematite iron ore?

Cobalt oxide
Titanium oxide
Calcium oxide
Manganese oxide

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Mechanical Operations
To get a fine talc powder from its granules, the equipment used is

Roller crusher
Gyratory crusher
Jaw crusher
Ball mill

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