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Mechanical Operations

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

Frother
Collector
Modifier
Activator

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Mechanical Operations
Length/diameter ratio of a ball mill is

> 1
< 1
1.5
1

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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
0.5 D
1.5 D
2 D

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Mechanical Operations
Metallic wire mesh is used as a filtering medium for the separation of dust from dust laden gas in case of a/an

Bag filter
Venturi scrubber
Hydrocyclones
Air filter

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Mechanical Operations
To get a fine talc powder from its granules, the equipment used is

Gyratory crusher
Roller crusher
Ball mill
Jaw crusher

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Mechanical Operations
Size reduction of __________ is accomplished in steam heated rollers and roll crushers.

Hard rubber
Resins
Gums
Waxes

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