Discussion
The main outlet of a thresher delivers \( 300 \) kg of material containing \( 291 \) kg of clean grain. The cleaning efficiency is
Answer: B
Correct answer: 97.0 per cent
Cleaning efficiency is the proportion of the delivered stream that is clean grain:
\[ \eta = \frac{291}{300} \times 100 = 97.0\ \mathrm{per\ cent} \]
The remaining 9 kg is chaff, straw fragments and dust that the shoe failed to remove. Note that this is a measure of purity at the outlet and says nothing about how much grain was lost - a shoe could deliver a perfectly clean sample while blowing a great deal of grain out with the chaff.
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