Discussion
Match each loss term in List I with the setting that most directly reduces it in List II.
List I
A. Unthreshed loss
B. Blown loss
C. Separation loss
D. Breakage
List II
1. Lower fan speed
2. Tighter concave clearance
3. Lower cylinder speed
4. Lower feed rate
Select the correct match.
Answer: D
Correct answer: A-2, B-1, C-4, D-3
Each loss is matched to the setting that most directly reduces it. Unthreshed loss (A) is cured by a tighter concave clearance (2), which works the mat harder. Blown loss (B) is cured by a lower fan speed (1).
Separation loss (C) is cured by a lower feed rate (4), thinning the mat so grain can shake free of the straw. Breakage (D) is cured by a lower cylinder speed (3). Note that the first and last pull against each other, which is the central compromise in setting a thresher.
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