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Mechanical Operations

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

Frother
Modifier
Collector
Activator

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

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

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Mechanical Operations
For grinding of cereals, grains, spices, pigments, saw dust, cork etc., the most extensively used size reduction equipment is a

Buhrstone mill
Hammer mill
Crushing rolls
Ball mill

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Mechanical Operations
Which of the following parts of a jaw crusher is subjected to maximum wear and tear during its operation?

Check plates
Jaw plates
Crush shaft
Toggles

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Mechanical Operations
To produce talcum powder, use

Ball mill
Jet mill
Hammer mill
Pin mill

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Mechanical Operations
Size reduction of the __________ can be suitably done by ball mills, crushing rolls and rod mills.

Metalliferrous ores
Asbestos & mica
Basic slags
Non-metallic ores

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