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Mechanical Operations

Mechanical Operations
Fibrous material is broken by a

Tube mill
Ball mill
Rollcrusher
Squirrel-cage disintegrator

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Mechanical Operations
The optimum moisture content in solids to be crushed/ground ranges from __________ percent.

3 to 4
15 to 20
8 to 10
10 to 15

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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.

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

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Mechanical Operations
Ultracentrifuges running at speeds upto 100000 rpm is normally used for the

Dewaxing of lubricating oil
Separation of cream from milk
Concentration of rubber latex
Separation of isotopes based on their density or molecular weights difference

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Mechanical Operations
Vacuum filter is most suitable for the

Removal of fines from liquid
None of these
Liquids having high vapour pressure
Liquids of very high viscosity

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Mechanical Operations
__________ are used for the separation of coarse particles from a slurry of fine particles.

Thickeners
Decanters
Classifiers
Hydrocyclones

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MORE MCQ ON Mechanical Operations

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