Mechanical Operations
Which of the follwoing mechanical conveyors does not come under the division 'scrapers'?

Ribbon conveyor
Drag conveyor
Bucket elevators
Flight conveyor

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Mechanical Operations
Arrange the following size reduction equipment in the decreasing order of the average particle size produced by each of them.

Ball mill, Jaw crusher, Fluid energy mill
Jaw crusher, Ball mill, Fluid energy mill
Fluid energy mill, Ball mill, Jaw crusher
Fluid energy mill, Jaw crusher, Ball mill

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