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Mechanical Operations

Mechanical Operations
Sphericity of a cubical particle, when its equivalent diameter is taken as the height of the cube, is

√3
1
0.5
√2

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Mechanical Operations
Which of the following is a continuous filter?

Plate and frame filter
None of these
Shell and leaf filter
Cartridge filter

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Mechanical Operations
In a size reduction crushing operation, the feed size is 10 to 50 mm, while the product size is 2 to 10 mm. This is a case of __________ crushing.

Primary
Ultrafine
Fine
Secondary

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Mechanical Operations
The specific surface of spherical particles is given by (where D and ρ are diameter and density of particle).

2/D.p
4/D.p
6/D.p
12/D.p

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Mechanical Operations
The energy required per unit mass to grind limestone particles of very large size to 100 μm is 12.7 kWh/ton. An estimate (using Bond's law) of the energy to grind the particles from a very large size to 50 μrn is

9.0 kWh/ton
6.35 kWh/ton
18 kWh/ton
25.4 kWh/ton

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Mechanical Operations
Additives used for promoting the floccula-tion of particles is a/an

Surface active agent
Both A & B
Electrolyte
Neither A nor B

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