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Mechanical Operations

Mechanical Operations
Which of the following comes in the category of primary crusher for hard and tough stone?

Cone crusher
None of these
Jaw crusher
Gyratory crusher

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Mechanical Operations
Sphericity is the ratio of the surface area of a spherical particle having the same volume as the particle to the surface area of the particle. Which of the following has the maximum value of sphericity?

Raschig rings
Sphere
Cylinder (L/D = 1)
Cube

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Mechanical Operations
In constant pressure filtration,

Rate of filtration decreases with time
Resistance decreases with time
Rate of filtration is constant
Rate of filtration increases with time

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Mechanical Operations
200 mesh screen means 200 openings per

Cm²
Inch²
Cm
Inch

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Attrition
Cutting
Compression
Impact

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Mechanical Operations
Which of the following is not an ultrafine grinder (colloid mill)?

Micronizers
Toothed roll crusher
Agitated mills and fluid energy mills
Hammer mills with internal classification

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