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Mechanical Operations

Mechanical Operations
The sphericity of a cylinder of 1 mm diameter and length 3 mm is

0.9
0.5
0.6
0.78

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Mechanical Operations
In a mixer, the quantity, (v. L/D) is termed as __________ number(where, v = longitudinal velocity of material, L = length of the mixer, D = diffusivity in axial mixing).

Brinkman
Peclet
Weber
Schmidt

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Mechanical Operations
In a grinding operation, the limiting particle size is the size of the __________ particle in the sample.

Largest
Neither A nor B
Smallest
Either A or B

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Mechanical Operations
The most suitable filter for the removal of very small amount of precipitate from very large volumes of water is the __________ filter.

Vacuum
Rotary
Plate & frame
Sand

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Mechanical Operations
Filtration capacity of a rotary drum vacuum filter depends upon the

Cake thickness
Both A & B
Characteristics of the feed slurry
Neither A nor B

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Mechanical Operations
Driving force in case of filtration by a centrifuge is the

Centrifugal pressure exerted by the liquid
Speed of the centrifuge
Formation of highly porous cake
Narrow diameter of the vessel

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