Discussion
The concave in a thresher is
Answer: B
Correct answer: The curved grate beneath the cylinder
The concave is the curved, perforated grate that wraps beneath the rotating cylinder, and the gap between the two is where threshing actually happens. The crop is worked in that gap, and the detached grain falls through the openings while the straw is carried on.
Its clearance is the single most important adjustment on the machine after cylinder speed: closing it threshes more thoroughly but damages more grain. The straw hood, the feeding chute and the fan housing are all elsewhere and take no part in detaching grain.
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