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Mechanical Operations

Mechanical Operations
Specific surface area is the surface area of a unit __________ of materials.

Neither A nor B
Either A or B
Weight
Volume

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Mechanical Operations
Theoretical capacity of crushing rolls in tons/hr is given by (where, V = peripherial velocity, m/sec. W = width of rolls, m Dr = distance between rolls ρ = density of material to be crushed, kg/m³ here, V =πN.D where, N = speed of the rolls in rotation per second (rps) D = diameter of rolls, m)

3.6 W.Dr.ρ
3.6 V.W.Dr/ρ
3.6 V.W. ρ
3.6 V.W.Dr.ρ

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Mechanical Operations
To remove dirt from the flowing fluid, we use a

Clarifier
Coagulant
Gravity settler
Strains

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Mechanical Operations
__________ is used for producing a thick suspension from a thin slurry.

Plate and frame filter press
Pressure filter thickener
Cartridge filter
Rotary drum vacuum filter

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Mechanical Operations
Gravity settling process is not involved in the working of a

Classifier
Dorr-thickener
Hydrocyclone
Sedimentation tank

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Mechanical Operations
The main size reduction operation in ultrafine grinders is

Compression
Cutting
Attrition
Impact

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