Discussion
A cleaning shoe receives \( 400 \) kg/h of material of which \( 340 \) kg/h is grain. If \( 6 \) kg/h of grain leaves with the chaff, the shoe's grain recovery is
Answer: A
Correct answer: 98.2 per cent
Grain recovery is the proportion of the grain entering the shoe that leaves in the clean stream:
\[ \frac{340 - 6}{340} \times 100 = \frac{334}{340} \times 100 = 98.2\ \mathrm{per\ cent} \]
The 400 kg/h total feed is not the denominator; the measure concerns grain. Recovery and cleaning efficiency pull against each other - raising the fan speed gives a cleaner sample but blows more grain away - so the shoe is set at the compromise between them.
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