Discussion
Statement I: Threshing efficiency and cleaning efficiency measure different things.
Statement II: Threshing efficiency concerns detachment while cleaning efficiency concerns the purity of the delivered stream.
In the light of the above statements, choose the correct answer.
Answer: D
Correct answer: Both Statement I and Statement II are correct
Both statements are correct, and the distinction they draw is worth holding firmly. Threshing efficiency asks how much grain was detached from the head; cleaning efficiency asks how pure the delivered stream is.
A machine can score well on one and badly on the other. It might detach every grain and still deliver a sample full of chaff, or produce a beautifully clean sample while leaving grain on the heads. They are set by different adjustments - cylinder and concave for one, fan and sieves for the other.
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