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?

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

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Mechanical Operations
A filter press is

Not suitable, if the liquid is the main product
A batch filter
Not suitable for wide range of materials under varying operating conditions of cake thickness and pressure
Having prohibitively high maintenance cost

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