MECHANICAL OPERATIONS QUIZ

To remove very small amount of tiny solid impurities from liquid, we use a

Pressure filter

Centrifugal filter

Vacuum filter

Coagulant

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Rod mills employed for grinding

All of these

Employ steel rods of 2-12 cms diameter extending over full length of the mill

Employ a steel shell having L/D ratio of 1.5 to 3.0

Is useful for handling sticky materials

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Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an

Air filter

Bag filter

Venturi scrubber

Hydrocyclones

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In paint industries, blending of light paste is done by using a

Charge can mixer

None of these

Masticator

Kneader

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Which one is a filter aid?

Diatomaceous earth

Calcined lime

Convas fabric

None of these

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The process by which fine solids is removed from liquids is termed as

Decantation

Flocculation

Classification

Sedimentation

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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 dp Sp/Vp

Φs = dp Sp/Vp

Φs = 6 Vp/dp sp

Φs = Vp/dp sp

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Capacity of flight conveyor in tons/hr is given by (where, W & D = width and depth of flight respectively in metre V = speed of the conveyor, metre/second ρ = bulk density of material, kg/m³)

3.6 W.D.V.ρ

3.6 W.D.V.

3.6 D.V.ρ

3.6 W.V.ρ

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For spheres, the specific surface shape factor is given by

A/V

√(AD/V)

AD/V

D/V

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Raw materials are charged in the iron blast furnace using

Skip hoist

Bucket elevator

Screw conveyor

None of these

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