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Mechanical Operations

Mechanical Operations
Optimum ratio of operating speed to critical speed of a trommel is

0.33-0.45
1.33-1.45
1.5-2.5
0.5-2

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Mechanical Operations
Sulphuric acid mist is arrested by using a __________ scrubber.

Venturi
Packed wet
Co-current
Hollow wet

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

Sedimentation
None of these
Flocculation
Filtration

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Mechanical Operations
The capacity of a pneumatic conveying system depends upon the

All of these
Bulk density of materials
Diameter of the conveying line
Pressure of the conveying air

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Mechanical Operations
Colloid mills achieve size reduction mainly by

Compression
Impact
Cutting
Attrition

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Mechanical Operations
Sedimentation on commercial scale occurs in

Thickeners
Cyclones
Rotary drum filters
Classifiers

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