Discussion
Three of the following raise grain damage. Which reduces it?
Opening the concave clearance
Raising cylinder speed
Closing the concave clearance
Threshing very dry grain
Answer: B
Correct answer: Opening the concave clearance
Opening the concave gives the mat more room, so it is compressed and rubbed less severely and fewer grains are cracked. It is the standard first move when damage is too high.
The other three all raise damage: a higher cylinder speed increases impact energy with the square of the speed, closing the concave works the mat harder, and very dry grain is brittle and cracks under treatment it would tolerate at a higher moisture.
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