Discussion
A paddy thresher is normally run at a lower cylinder speed than a wheat thresher because
Answer: D
Correct answer: Paddy grain cracks more readily
Rice kernels are brittle, and a crack put into the grain at threshing does not stay a crack - the kernel breaks along it during hulling and whitening, so the damage appears later as a fall in head rice yield, where the money is.
Paddy straw is not especially tough and the heads are not hard to detach, so nothing about the crop requires a high speed. The lower setting is a deliberate concession to the fragility of the grain, and the same reasoning governs drying and handling throughout the chain.
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