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Mechanical Operations

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

Activator
Modifier
Frother
Collector

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Mechanical Operations
Horsepower required for a roll crusher is directly proportional to its

Capacity
Both A & B
Neither A nor B
Reduction ratio

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Mechanical Operations
Carbon black is pulverised in a

Ball mill
Hammer crusher
Roll crusher
Gyratory crusher

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Mechanical Operations
Work index is the gross energy (kWh/tonne of feed) necessary to reduce a very large feed to such a size that 80% of product particles will pass through a 0.1 mm screen. The value of work index determined for wet grinding should be multiplied with __________ to get the same for dry grinding.

0.5
1
1.34
4.34

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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?

Jaw plates
Crush shaft
Toggles
Check plates

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Mechanical Operations
With increase in the capacity of screens, the screen effectiveness

Decreases
Increases
Decreases exponentially
Remains unchanged

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