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Mechanical Operations

Mechanical Operations
__________ mills are termed as impactors.

Rolling-compression
Hammer
Cage
None of these

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

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Mechanical Operations
In a size reduction crushing operation, feed size is 300 to 1500 mm while the product size is 100 to 300 mm. This is a case of the __________ crushing.

Ultrafine
Secondary
Primary
Fine

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Mechanical Operations
Which of the following minerals is not subjected to magnetic separation method?

Rutile
Galena
Siderite
Chromite

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Mechanical Operations
A __________ employs a set of screen across a flow channel for the separation of dirt/rust from a flowing liquid stream.

Thickener
Clarifier
Strainer
Classifier

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Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

√2
√3
1
0.5

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