Discussion
Statement I: Opening the concave clearance reduces grain damage.
Statement II: A wider gap works the mat less severely against the concave.
In the light of the above statements, choose the correct answer.
Answer: B
Correct answer: Both Statement I and Statement II are correct
Both statements are correct and the second is the mechanism. A wider gap between cylinder and concave means the mat is compressed less and rubbed less severely, so less energy is put into each grain and fewer are cracked.
The cost is threshing thoroughness: some grain will leave still attached to the head. That trade is made deliberately on seed crops, where a cracked grain will not germinate and the unthreshed remainder can be recovered by a second pass.
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