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Mechanical Operations

Mechanical Operations
Size reduction of moulding powders, waxes, resins & gums are done in a __________ mill.

Hammer
Cage
Both A & B
Neither A nor B

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Mechanical Operations
With increase in drum speed, in a rotary drum filter, the filtration rate

Is not affected
Increases linearly
Increases
Decreases

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Mechanical Operations
In case of a hammer crusher, the final product size depends on the

Feed rate
Clearance between hammer & grinding plates
Rotor speed
All of these

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Mechanical Operations
Which of the following is the most suitable for cleaning of fine coal dust (<0.5 mm)?

Baum jig washer
Spiral separator
Froth floatation
Trough washer

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Mechanical Operations
Pine oil used in froth floatation technique acts as a/an

Frother
Modifier
Activator
Collector

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Mechanical Operations
The reduction ratio for fine grinders is

43961
44124
As high as 100
20-40

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