Discussion
Raising cylinder speed generally
Answer: A
Correct answer: Increases threshing efficiency but also increases grain damage
Faster cylinder rotation means a harder blow and more work done on the crop, so more grain is detached - and more is cracked. The two move together, and the operator's task is to find the speed that threshes adequately while keeping damage acceptable.
The relationship is not linear: impact energy rises with the square of the peripheral speed, so raising the speed from 15 to 20 m/s increases the energy per unit mass by a factor of 1.78. Damage therefore climbs faster than threshing does.
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