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Mechanical Operations

Mechanical Operations
For spheres, the specific surface shape factor is given by

√(AD/V)
D/V
A/V
AD/V

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Mechanical Operations
Number of particles in a crushed solid sample is given by (where, m = mass of particles in a sample, Vp = volume of one particle, ρ= density of particles)

M . Vp/ρ
M/ρ . Vp
M . ρ/Vp
Vp/m . ρ

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Mechanical Operations
The study on washability of coal is done by using the __________ technique.

None of these
Heavy media separation
Elutriation
Tabling

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Mechanical Operations
Ball mill is used for

Fine grinding
Attrition
Crushing
Coarse grinding

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Mechanical Operations
As per Taggart's formula, the capacity (kg/hr) of Jaw & Gyratory crushers (for gapes of 10 to 60 cms) is equal to (where, L = Length of feed opening, cms S = Maximum width of discharge opening, cms )

93 LS
√LS
LS
250 LS

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Mechanical Operations
Which of the following terminology is not used for size reduction of materials to fine sizes or powders?

Dispersion
Pulverisation
Comminution
Compression

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