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Mechanical Operations

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

Frother
Collector
Activator
Modifier

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Mechanical Operations
Filter aid is used to

Decrease the pressure drop
Act as a support base for the septum
Increase the porosity of the cake
Increase the rate of filtration

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

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

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Mechanical Operations
Maximum size reduction in a fluid energy mill is achieved by

Interparticle attrition
Impact
Compression
Cutting

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Mechanical Operations
According to Taggart's rule for selecting between a gyratory crusher and a jaw crusher; the later should be used, if the hourly tonnage to be crushed divided by the square of the gape expressed in cm is less than

1.84
0.184
0.00184
0.0184

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Mechanical Operations
What is the critical rotation speed in revolutions per second, for a ball mill of 1.2 m diameter charged with 70 mm dia balls?

1
0.5
0.66
2.76

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