Discussion
A thresher is fed \( 800 \) kg of crop containing \( 320 \) kg of grain, of which \( 8 \) kg remains attached to the heads. The threshing efficiency is
Answer: A
Correct answer: 97.5 per cent
Threshing efficiency is the proportion of the grain that was actually detached:
\[ \eta = \frac{320 - 8}{320} \times 100 = \frac{312}{320} \times 100 = 97.5\ \mathrm{per\ cent} \]
The 800 kg of crop is not part of the calculation - the measure concerns grain, not total material. The 8 kg still on the heads is the unthreshed loss, and reducing it means a faster cylinder or a tighter concave, both of which would raise damage.
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