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Mechanical Operations

Mechanical Operations
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

10 to 15
15 to 20
8 to 10
3 to 4

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Mechanical Operations
__________ balls capable of grinding the feed in a ball mill gives the maximum efficiency.

Minimum size
Elliptical
Maximum size
Cast iron

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Mechanical Operations
The capacity of a classifier in 'tons of solid/hr' is given by (where, A = cross-sectional area, m² V = rising velocity of fluid, m/sec.S = percentage of solids in the suspension by volume.ρ = density of solids, kg/m³)

3.6 A.V.ρ
3.6 AVS.ρ
3.6 AVS/ρ
3.6 A.S. ρ

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Mechanical Operations
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

Either A or B
Smallest
Neither A nor B
Largest

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Mechanical Operations
Which of the following is the most suitable filter for separation of abrasive solids suspended in a corrosive liquid?

Plate and frame filter press
Batch basket centrifuge
Vacuum filter
Sand bed filter

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Mechanical Operations
Mesh indicates the number of holes per

Square inch
Linear foot
Linear inch
Square foot

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