Discussion
Match each cylinder type in List I with its dominant action in List II.
List I
A. Spike-tooth
B. Rasp-bar
C. Wire-loop
D. Axial rotor
List II
1. Rubbing against the concave
2. Impact of pegs on the crop
3. Repeated rubbing over a long helical path
4. Gentle rubbing with flexible loops
Select the correct match.
Answer: C
Correct answer: A-2, B-1, C-4, D-3
Each cylinder is matched to its dominant action. The spike-tooth (A) works by impact of pegs on the crop (2); the rasp-bar (B) by rubbing against the concave (1).
The wire-loop (C) works by gentle rubbing with flexible loops (4), and the axial rotor (D) by repeated rubbing over a long helical path (3). The list runs from the most violent action to the gentlest and then to the most extended, which broadly tracks straw breakage and grain damage.
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