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Mechanical Operations

Mechanical Operations
Sedimentation on commercial scale occurs in

Cyclones
Rotary drum filters
Classifiers
Thickeners

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Mechanical Operations
Pebble mills are tumbling mills widely used for grinding in the manufacture of paints & pigments and cosmetic industries, where iron contamination in the product is highly objectionable. Pebbles used in pebble mill are made of

Flint or porcelain
Bronze
Stainless steel
Concrete

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Mechanical Operations
Diatomaceous earth is a/an

Filter medium
Catalyst
Explosive
Filter aid

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Mechanical Operations
Dust collection efficiency of electrostatic precipitator can be as high as 99.9%. Maximum temperature and pressure of dust laden gas that can be cleaned in an electrostatic precipitator is respectively.

200°C and 5 atm
1000°C and 10 atm
500°C and 50 atm
1000°C and 500 atm

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Mechanical Operations
Horsepower required for a roll crusher is directly proportional to its

Reduction ratio
Neither A nor B
Capacity
Both A & B

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Mechanical Operations
The porosity of a compressible cake is

Same throughout the thickness of cake
Maximum at the filter medium
Minimum at the upstream face
Minimum at the filter medium

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