Discussion
Cylinder types and their characteristics.
| Cylinder | Dominant action | Straw breakage | Typical use |
|---|---|---|---|
| Spike-tooth | Impact | High | Tough and damp crops |
| Rasp-bar | Rubbing | Low | Small grains |
| Wire-loop | Gentle rubbing | Very low | Paddy and seed crops |
| Axial rotor | Repeated rubbing | Moderate | High capacity combines |
Which cylinder would be chosen for a seed crop where germination must be preserved?
Answer: C
Correct answer: Wire-loop
The table gives the wire-loop the lowest straw breakage and names paddy and seed crops as its typical use, which is exactly the requirement here: mechanical damage to the embryo destroys germination, and a seed lot that will not germinate is worthless whatever else is true of it.
A spike-tooth cylinder works by impact and would be the worst choice. The rasp-bar and axial rotor are gentler but still work the crop harder than flexible loops do, and some unthreshed grain is an acceptable price here.
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