Discussion
Three of the following convey material mechanically. Which uses a fluid?
Pneumatic conveyor
Screw conveyor
Drag conveyor
Bucket elevator
Answer: A
Correct answer: Pneumatic conveyor
A pneumatic conveyor uses air as the transport medium, entraining the particles in a moving stream rather than pushing or carrying them with a mechanical element.
The other three are mechanical: a screw pushes material with a rotating flight, a drag conveyor pulls it along a trough with flights on a chain, and a bucket elevator carries it in buckets on a belt or chain. The distinction matters for power - moving air for every tonne of product is expensive - and for the routing flexibility a pipe allows.
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