Discussion
In a conventional tangential thresher, separation of grain from straw after the cylinder is done by
Answer: C
Correct answer: Straw walkers or a separating drum
The cylinder and concave detach the grain, but a good deal of it leaves still mixed with the straw. Straw walkers - oscillating stepped racks - shake that straw so the remaining grain falls through, while the straw itself is walked to the discharge.
The concave separates only what falls through it at the cylinder, and the cleaning shoe works on the grain and chaff after the straw has been removed. Each stage handles a different mixture, which is why all three exist.
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