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Mechanical Operations

Mechanical Operations
Grindability of a material does not depend upon its

Hardness
Size
Elasticity
Toughness

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

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Mechanical Operations
The reduction ratio for fine grinders is

As high as 100
43961
44124
20-40

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Mechanical Operations
Coal is finally pulverised to 200 mesh size for burning in boilers by a

Ball mill
Gyratory crusher
Roll crusher
Hammer crusher

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Mechanical Operations
Where the density difference of the two liquid phase to be separated is very small (as in milk cream separator), the most suitable separator is a

Sparkler filter
Sharpies supercentrifuge
Batch basket centrifuge
Disc bowl centrifuge

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Mechanical Operations
The process opposite to 'dispersion' is termed as the

Flocculation
None of these
Filtration
Sedimentation

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