Discussion
A thresher in which the crop travels along the cylinder axis on a helical path is an _____ thresher.
Answer: C
Correct answer: axial-flow
In an axial-flow machine the crop enters at one end and travels along the rotor on a helical path, passing over the concave many times before being discharged. A tangential machine, by contrast, carries the crop across the cylinder in a single short pass.
The repeated working gives thorough threshing with a gentler action per pass, which suits high-capacity combines. The cost is energy: keeping the mat moving along the whole rotor consumes more power per tonne than a single pass does.
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