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Mechanical Operations

Mechanical Operations
Reciprocal of sphericity is termed as the

Sauter diameter
Specific surface ratio
Surface area per unit mass
Shape factor

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Mechanical Operations
Agglomeration of individual particles into clusters (flocs) is called flocculation. To prevent flocculation, the most commonly used dispersing agents are

Bi-carbonates
Carbonates
Sulphates
Silicates & phosphates

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Mechanical Operations
Ball mills and tube mills with flint or porcelain balls are used for size reduction of

Non-metallic ores
Rubber
Limestone
Asbestos

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Mechanical Operations
The power number for a stirred tank becomes constant at high Reynolds number. In this limit, the variation of power input with impeller rotational speed (N) is proportional to

N²
N°
N¹
N³

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Mechanical Operations
Rittinger number which designates the new surface prduced per unit of mechanical energy absorbed by the material being crushed, depends on the

Elastic constant of the material
State or manner of application of the crushing force
All of these
Ultimate strength of the material

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Mechanical Operations
For laminar flow of filtrate through the cake deposited on septum, which of the following will be valid?

Leva
None of these
Blake-Plummer equation
Kozney-Karman equation

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