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Mechanical Operations

Mechanical Operations
Filtration rate through a filter cake is proportional to (where, S = filtering surface R = specific cake resistance μ = viscosity of the filtrate)

S
All of these
1/R
1/μ

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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

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

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Mechanical Operations
In bag filters, filter fabrics are never made of

Metallic wire woven mesh
Polyester fibres
Nylon fibres
Cotton fibres

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Mechanical Operations
What is the usual value of angle of nip for crushing of ordinary rock in smooth steel crushing rolls?

32°
40°
16°
46°

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Mechanical Operations
__________ mills are termed as disintegrators.

Compartment
Cage
Pebble
All of these

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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
Asbestos
Limestone

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