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Mechanical Operations

Mechanical Operations
In froth floatation, chemical agent added to cause air adherence is called

Collector
Activator
Frother
Modifier

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Mechanical Operations
The inlet pressure in a constant rate filtration

None of these
Decreases gradually
Increases continuously
Remains constant

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Mechanical Operations
Height of liquid in agitation tank is normally maintained equal to the tank diameter. However, if the tank is too tall and a large liquid hold up is desired, then two or more impellers mounted on the same shaft may be used. The clearance between the tank bottom and the bottom most impeller should be about (where, D = impeller diameter)

D
1.5 D
0.5 D
2 D

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Mechanical Operations
The specific cake resistance for incompressible sludges is (where ΔP = pressure drop over cake)

∝ √ΔP
∝ 1/ ΔP
∝ ΔP
Independent of ΔP

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Mechanical Operations
__________ mill is not used for grinding wheat into flour and for milling of cereals & other vegetable products.

Buhrstone
Roller
Attrition
Pebble

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Mechanical Operations
__________ mills fall in the category of tumbling mills,

Ball and pebble
Compartment
All of these
Rod and tube

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