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Mechanical Operations

Mechanical Operations
To get ultrafine particles, the equipment used is a

Fluid energy mill
Ball mill
Rod mill
Hammer crusher

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Mechanical Operations
The value of 'angle of nip' is generally about

16°
64°
32°
52°

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Mechanical Operations
The distribution given by microscopic analysis of powder is

Volume
Area
Number
Length

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

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Mechanical Operations
Run of mine (ROM) coal is crushed by a __________ for use in domestic ovens.

Jaw crusher
Tube mill
Hammer crusher
Ball mill

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Mechanical Operations
If radius of a batch basket centrifuge is halved & the r.p.m. is doubled, then the

Linear speed of the basket is halved
Centrifugal force is doubled
Capacity of centrifuge is increased
Linear speed of the basket is doubled

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