Discussion
Of \( 500 \) kg of grain entering a thresher, \( 6 \) kg leaves with the straw and \( 4 \) kg is blown out with the chaff. The total separation and blown loss is
Answer: A
Correct answer: 2.0 per cent
Add the two losses and express them against the grain entering:
\[ \frac{6 + 4}{500} \times 100 = \frac{10}{500} \times 100 = 2.0\ \mathrm{per\ cent} \]
The two have different causes and different remedies: grain leaving with the straw is a separation loss, cured by slowing the feed or improving the walkers, while grain blown out with the chaff is a fan setting that is too high. Measuring them separately is what tells the operator which adjustment to make.
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