Discussion
A crop has a straw-to-grain ratio of \( 1.5 \). To deliver \( 1.0 \) tonne of grain per hour, the total feed rate must be
Answer: B
Correct answer: 2.5 t/h
A straw-to-grain ratio of 1.5 means every tonne of grain arrives with 1.5 tonnes of straw, so the total material is 2.5 times the grain:
\[ 1.0 \times (1 + 1.5) = 2.5\ \mathrm{t/h} \]
This is why the ratio matters so much to machine sizing. The cylinder, the walkers and the shoe must all handle the whole of the material fed, not merely the grain, so a crop with a high straw-to-grain ratio loads a thresher far more heavily for the same grain output.
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